<![CDATA[Civil Engineering Association - Civil Engineering MSc and PhD thesis]]> https://forum.civilea.com/ Wed, 29 Apr 2026 15:32:04 +0000 MyBB <![CDATA[Helical Stair Analysis and Design Theses Collection]]> https://forum.civilea.com/thread-54367.html Fri, 19 May 2017 18:30:12 +0300 abouferass88]]> https://forum.civilea.com/thread-54367.html A SIMPLE DESIGN APPROACH FOR HELICOIDAL STAIR SLABS



[Image: 75649221769654209756.png]
  • Author(s): ZIA WADUD
  • Published By: BANGLADESH UNIVERSITY OF ENGINEERING AND TECHNOLOGY
  • Size: 1.8 MB
  • Quality: Unspecified

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Analysis Aid Preparation for Self Supporting Fixed Ended Helical Stairs



[Image: 99789732355212578412.png]
  • Author(s): Yonathan Gizaw
  • Published By: ADDIS ABABA UNIVERSITY  - INSTITUTE OF SCIENCE AND TECHNOLOGY
  • Size: 1.1 MB
  • Quality: Unspecified

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A DESIGN RATIONALE FOR HELICOIDAL STAIR SLABS



[Image: 26787743440884805441.png]
  • Author(s): Sukomal Modak
  • Published By: Departmcnt of Civil Engineering  - Bangladesh University of Enginecring & Tcchnology,
  • Size: 2.3 MB
  • Quality: Unspecified

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]]> A SIMPLE DESIGN APPROACH FOR HELICOIDAL STAIR SLABS



[Image: 75649221769654209756.png]
  • Author(s): ZIA WADUD
  • Published By: BANGLADESH UNIVERSITY OF ENGINEERING AND TECHNOLOGY
  • Size: 1.8 MB
  • Quality: Unspecified

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Analysis Aid Preparation for Self Supporting Fixed Ended Helical Stairs



[Image: 99789732355212578412.png]
  • Author(s): Yonathan Gizaw
  • Published By: ADDIS ABABA UNIVERSITY  - INSTITUTE OF SCIENCE AND TECHNOLOGY
  • Size: 1.1 MB
  • Quality: Unspecified

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A DESIGN RATIONALE FOR HELICOIDAL STAIR SLABS



[Image: 26787743440884805441.png]
  • Author(s): Sukomal Modak
  • Published By: Departmcnt of Civil Engineering  - Bangladesh University of Enginecring & Tcchnology,
  • Size: 2.3 MB
  • Quality: Unspecified

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]]> <![CDATA[Reliability of Steel Columns Protected by Intumescent Coatings Subjected to Fire]]> https://forum.civilea.com/thread-54343.html Mon, 08 May 2017 11:52:22 +0300 Dell_Brett]]> https://forum.civilea.com/thread-54343.html Reliability of Steel Columns Protected by Intumescent Coatings Subjected to Natural Fires

Author(s)/Editor(s): Chao Zhang | Size: 7,4 MB | Format: PDF | Quality: Original preprint | Publisher: Springer (Springer Theses) | Year: 2015-02-26 | pages: 155 | ISBN: 9783662463789

[Image: 41532872625270796985.jpg]


[Image: info.png]

This thesis studied the effect of aging of intumescent coatings (ICs) on the reliability of protected steel columns in fire condition and developed a probabilistic approach to assess the service life of ICs applied on steel columns. In the study, Monte Carlo simulations were conducted to obtain the reliability index or failure probability of steel columns protected by ICs subjected to compartment fires.  The effect of aging of intumescent coatings on the failure probability of protected steel columns was investigated by using variable insulation property of intumescent coatings in the simulation. The test data on aging effect on insulation property of intumescent coatings from literature was used. Based on the reliability analysis, a probabilistic approach is given to determine the service life of intumescent coatings for steel columns. In that approach, the failure probability of the protected steel columns is compared with the target probability of the structural fire design. The approach can also be used for probabilistic analysis of steel columns protected by conventional inert fire protection materials.

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]]> Reliability of Steel Columns Protected by Intumescent Coatings Subjected to Natural Fires

Author(s)/Editor(s): Chao Zhang | Size: 7,4 MB | Format: PDF | Quality: Original preprint | Publisher: Springer (Springer Theses) | Year: 2015-02-26 | pages: 155 | ISBN: 9783662463789

[Image: 41532872625270796985.jpg]


[Image: info.png]

This thesis studied the effect of aging of intumescent coatings (ICs) on the reliability of protected steel columns in fire condition and developed a probabilistic approach to assess the service life of ICs applied on steel columns. In the study, Monte Carlo simulations were conducted to obtain the reliability index or failure probability of steel columns protected by ICs subjected to compartment fires.  The effect of aging of intumescent coatings on the failure probability of protected steel columns was investigated by using variable insulation property of intumescent coatings in the simulation. The test data on aging effect on insulation property of intumescent coatings from literature was used. Based on the reliability analysis, a probabilistic approach is given to determine the service life of intumescent coatings for steel columns. In that approach, the failure probability of the protected steel columns is compared with the target probability of the structural fire design. The approach can also be used for probabilistic analysis of steel columns protected by conventional inert fire protection materials.

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]]> <![CDATA[Capacity Design Optimization of Steel Building Frameworks Using Nonlinear Time-Histor]]> https://forum.civilea.com/thread-53400.html Thu, 13 Oct 2016 19:05:05 +0300 TurboXUser]]> https://forum.civilea.com/thread-53400.html Capacity Design Optimization of Steel Building Frameworks Using Nonlinear Time-History Analysis

A PhD thesis in Civil Engineering presented to the University of Waterloo, Ontario, Canada

Author(s)/Editor(s): Yusong Xue | Size: 3,77 MB | Format: PDF | Quality: Unspecified | Year: 2012 | pages: 160


[Image: 07090254682301310103.jpg]



[Image: info.png]

This study proposes a seismic design optimization method for steel building frameworks following the capacity design principle. Currently, when a structural design employs an elastic analysis to evaluate structural demands, the analysis results can be used only for the design of fuse members, and the inelastic demands on non-fuse members have to be obtained by hand calculations. Also, the elastic-analysis-based design method is unable to warrant a fully valid seismic design since the evaluation tool cannot always capture the true inelastic behaviour of a structure. The proposed method is to overcome these shortcomings by adopting the most sophisticated nonlinear dynamic procedure, i.e., Nonlinear Time- (or Response-) History Analysis as the evaluation tool for seismic demands.
The proposed optimal design formulation includes three objectives: the minimum weight or cost of the seismic force resisting system, the minimum seismic input energy or potential earthquake damage and the maximum hysteretic energy ratio of fuse members. The explicit design constraints include the plastic rotation limits on individual frame members and the inter-story drift limits on the overall performance of the structure. Strength designs of each member are treated as implicit constraints through considering both geometric and material nonlinearities of the structure in the nonlinear dynamic analysis procedure. A multi-objective Genetic Algorithm is employed to search for the Pareto-optimal solutions.
The study provides design examples for moment resisting frames and eccentrically braced frames. In the examples some numerical strategies, such as integrating load and resistance factors in analysis, grouping design variables of a link and the beams outside the link, roundingoff the objective function values, are introduced. The design examples confirm that the proposed optimization formulation is able to conduct automated capacity design of steel frames. In particular, the third objective, to maximize the hysteretic energy ratio of fuse members, drives the optimization algorithm to search for design solutions with favorable plastic mechanisms, which is the essence of the capacity design principle.  
For the proposed inelastic-analysis-based design method, the seismic performance factors (i.e., ductility- and overstrength-related force reduction factors) are no longer needed. Furthermore, problem-dependent capacity design requirements, such as strong-column-weak-beam for moment resisting frames, are not included in the design formulation. Thus, the proposed design method is general and applicable to various types of building frames.


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]]> Capacity Design Optimization of Steel Building Frameworks Using Nonlinear Time-History Analysis

A PhD thesis in Civil Engineering presented to the University of Waterloo, Ontario, Canada

Author(s)/Editor(s): Yusong Xue | Size: 3,77 MB | Format: PDF | Quality: Unspecified | Year: 2012 | pages: 160


[Image: 07090254682301310103.jpg]



[Image: info.png]

This study proposes a seismic design optimization method for steel building frameworks following the capacity design principle. Currently, when a structural design employs an elastic analysis to evaluate structural demands, the analysis results can be used only for the design of fuse members, and the inelastic demands on non-fuse members have to be obtained by hand calculations. Also, the elastic-analysis-based design method is unable to warrant a fully valid seismic design since the evaluation tool cannot always capture the true inelastic behaviour of a structure. The proposed method is to overcome these shortcomings by adopting the most sophisticated nonlinear dynamic procedure, i.e., Nonlinear Time- (or Response-) History Analysis as the evaluation tool for seismic demands.
The proposed optimal design formulation includes three objectives: the minimum weight or cost of the seismic force resisting system, the minimum seismic input energy or potential earthquake damage and the maximum hysteretic energy ratio of fuse members. The explicit design constraints include the plastic rotation limits on individual frame members and the inter-story drift limits on the overall performance of the structure. Strength designs of each member are treated as implicit constraints through considering both geometric and material nonlinearities of the structure in the nonlinear dynamic analysis procedure. A multi-objective Genetic Algorithm is employed to search for the Pareto-optimal solutions.
The study provides design examples for moment resisting frames and eccentrically braced frames. In the examples some numerical strategies, such as integrating load and resistance factors in analysis, grouping design variables of a link and the beams outside the link, roundingoff the objective function values, are introduced. The design examples confirm that the proposed optimization formulation is able to conduct automated capacity design of steel frames. In particular, the third objective, to maximize the hysteretic energy ratio of fuse members, drives the optimization algorithm to search for design solutions with favorable plastic mechanisms, which is the essence of the capacity design principle.  
For the proposed inelastic-analysis-based design method, the seismic performance factors (i.e., ductility- and overstrength-related force reduction factors) are no longer needed. Furthermore, problem-dependent capacity design requirements, such as strong-column-weak-beam for moment resisting frames, are not included in the design formulation. Thus, the proposed design method is general and applicable to various types of building frames.


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]]> <![CDATA[Earth Pressures against- and Stability of Retaining Structures]]> https://forum.civilea.com/thread-53396.html Tue, 11 Oct 2016 18:44:32 +0300 TurboXUser]]> https://forum.civilea.com/thread-53396.html Earth Pressures against- and Stability of Retaining Structures



[Image: 65035694920700467100.jpg]
  • 30 ECTS thesis submitted in partial fulfillment of a Magister Scientiarum degree in Civil Engineering

  • Author(s): Sigurður Már Valsson     Published By: University of Iceland   Published Year: 2011   Size: 8,93 MB   Quality: Unspecified

  • Abstract:
    The objective of the presented research is to investigate methods used to calculate earth pressures against- and the stability of retaining structures. The classical methods of calculating earth pressures are covered in detail.  They are named after their creators Charles-Augustin de Coulomb and William John Macquorn Rankine.  A special interest is taken in a variant of Rankine‟s theory developed at Norges teknisk- naturvitenskapelige universitet (NTNU) that incorporates cohesive properties of soils as well as roughness between the structure and the soil material.  Both methods are then tested against each other in order to investigate if a clear link exists between the two.  The methods are tested against proposed design values of earth pressure coefficients according to the design standard Eurocode 7. Håndbok 016 is a design handbook published by the Norwegian Road Administration (n. Statens vegvesen).  In it is a chapter dedicated to the design of retaining structures and bridge abutments. The methods proposed to design retaining structures are used to design cantilevered structures of various heights and with various foundation- and backfill materials based on a few geometrical constraints. The structure designs created with methods in Håndbok 016 are modeled in the finite element program PLAXIS to test if the same material factors of safety could be derived that way. The results from this study are then discussed and commented upon.




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]]> Earth Pressures against- and Stability of Retaining Structures



[Image: 65035694920700467100.jpg]
  • 30 ECTS thesis submitted in partial fulfillment of a Magister Scientiarum degree in Civil Engineering

  • Author(s): Sigurður Már Valsson     Published By: University of Iceland   Published Year: 2011   Size: 8,93 MB   Quality: Unspecified

  • Abstract:
    The objective of the presented research is to investigate methods used to calculate earth pressures against- and the stability of retaining structures. The classical methods of calculating earth pressures are covered in detail.  They are named after their creators Charles-Augustin de Coulomb and William John Macquorn Rankine.  A special interest is taken in a variant of Rankine‟s theory developed at Norges teknisk- naturvitenskapelige universitet (NTNU) that incorporates cohesive properties of soils as well as roughness between the structure and the soil material.  Both methods are then tested against each other in order to investigate if a clear link exists between the two.  The methods are tested against proposed design values of earth pressure coefficients according to the design standard Eurocode 7. Håndbok 016 is a design handbook published by the Norwegian Road Administration (n. Statens vegvesen).  In it is a chapter dedicated to the design of retaining structures and bridge abutments. The methods proposed to design retaining structures are used to design cantilevered structures of various heights and with various foundation- and backfill materials based on a few geometrical constraints. The structure designs created with methods in Håndbok 016 are modeled in the finite element program PLAXIS to test if the same material factors of safety could be derived that way. The results from this study are then discussed and commented upon.




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]]> <![CDATA[Critical Comparative Feature Analysis Of Structural Software (Sap2000 And Staad.Pro)]]> https://forum.civilea.com/thread-53012.html Mon, 23 May 2016 20:44:57 +0300 rezart]]> https://forum.civilea.com/thread-53012.html Critical Comparative Feature Analysis Of Structural Software (Sap2000 And Staad.Pro) And The Nature Of Their Pirated Counterparts



[Image: 25945580238475982726.png]
  • Author(s): LETIBEB MAKONNEN ZELLEKE
  • Published By: ADDIS ABABA UNIVERSITY
  • Published Year: JULY 2009
  • Size: 600 KB
  • Quality: Original preprint
  • Abstract: A THESIS SUBMITTED TO
    THE SCHOOL OF GRADUATE STUDIES
    OF ADDIS ABABA UNIVERSITY

    This material explains in depth the differences between SAP2000 and STAAD PRO.
    It covers in depth the
    1- Modeling
    2- Analysis
    3- Design
    4- Output
    5- Import Export Utilities (communication between software)
    6- Special cases
    7- General features


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]]> Critical Comparative Feature Analysis Of Structural Software (Sap2000 And Staad.Pro) And The Nature Of Their Pirated Counterparts



[Image: 25945580238475982726.png]
  • Author(s): LETIBEB MAKONNEN ZELLEKE
  • Published By: ADDIS ABABA UNIVERSITY
  • Published Year: JULY 2009
  • Size: 600 KB
  • Quality: Original preprint
  • Abstract: A THESIS SUBMITTED TO
    THE SCHOOL OF GRADUATE STUDIES
    OF ADDIS ABABA UNIVERSITY

    This material explains in depth the differences between SAP2000 and STAAD PRO.
    It covers in depth the
    1- Modeling
    2- Analysis
    3- Design
    4- Output
    5- Import Export Utilities (communication between software)
    6- Special cases
    7- General features


[Image: download.png]

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]]> <![CDATA[The dynamic behaviour of tall buildings]]> https://forum.civilea.com/thread-52879.html Fri, 22 Apr 2016 09:42:21 +0300 bridgeengineer]]> https://forum.civilea.com/thread-52879.html The dynamic behaviour of tall buildings

Author(s)/Editor(s): Alan P Jeary | Size: 7,2 MB | Format: PDF | Quality: Unspecified | Publisher: University College London | Year: 1981 | pages: 208

[Image: 96857411861121679578.jpg]


[Image: info.png]

A study of the measurement, prediction and characterisation of
the dynamic behaviour of tall buildings is presented. Initially
a review of the history of tall buildings and the study of their
dynamic behaviour is presented. The characterisation of tall
buildings by conventional means and by the use of spectral
functions is considered.
The results of tests on twelve tall buildings and one quarter-scale
model are presented. The response of twelve of these structures
to wind excitation has been monitored, and, for the purpose of
calibration, all but one of the buildings has been excited
artificially by the use of eccentric mass vibrators. The handling
of deterministic and random data is considered and some new
techniques for their reduction are presented.
The introduction of a new vibrator system has allowed the study of
the dynamic characteristics of tall buildings with a greater
precision than has previously been possible. The new precision
has suggested reasons for the confusion which previously existed
in the assessment of dynamic characteristics of tall buildings,
and a new rationale for the prediction of natural frequencies and
damping ratios is presented.
Finally, currently popular methods for the prediction of the
response of tall buildings to wind excitation are considered and
comparisons have suggested several areas where research is
urgently needed.


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]]> The dynamic behaviour of tall buildings

Author(s)/Editor(s): Alan P Jeary | Size: 7,2 MB | Format: PDF | Quality: Unspecified | Publisher: University College London | Year: 1981 | pages: 208

[Image: 96857411861121679578.jpg]


[Image: info.png]

A study of the measurement, prediction and characterisation of
the dynamic behaviour of tall buildings is presented. Initially
a review of the history of tall buildings and the study of their
dynamic behaviour is presented. The characterisation of tall
buildings by conventional means and by the use of spectral
functions is considered.
The results of tests on twelve tall buildings and one quarter-scale
model are presented. The response of twelve of these structures
to wind excitation has been monitored, and, for the purpose of
calibration, all but one of the buildings has been excited
artificially by the use of eccentric mass vibrators. The handling
of deterministic and random data is considered and some new
techniques for their reduction are presented.
The introduction of a new vibrator system has allowed the study of
the dynamic characteristics of tall buildings with a greater
precision than has previously been possible. The new precision
has suggested reasons for the confusion which previously existed
in the assessment of dynamic characteristics of tall buildings,
and a new rationale for the prediction of natural frequencies and
damping ratios is presented.
Finally, currently popular methods for the prediction of the
response of tall buildings to wind excitation are considered and
comparisons have suggested several areas where research is
urgently needed.


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]]> <![CDATA[Modelling and simulation aspects of performace-based wind engineering of tall buildin]]> https://forum.civilea.com/thread-52867.html Thu, 21 Apr 2016 11:13:08 +0300 bridgeengineer]]> https://forum.civilea.com/thread-52867.html Modelling and simulation aspects of performace-based wind engineering of tall buildings

Author(s)/Editor(s): GORDON HENRY CLANNACHAN | Size: 6,5 MB | Format: PDF | Quality: Unspecified | Publisher: University of Strathclyde, Glasgow | Year: 2012 | pages: 266

[Image: 27886353129918971830.jpg]


[Image: info.png]

The study is concerned with developing an adequate Performance-Based Wind Engineering (PBWE) framework for tall building design. The focus is to introduce advanced modelling and simulation techniques to improve key analysis stages, namely by using Computational Fluid Dynamics (CFD) and Computational Structural Mechanics (CSM). The clearly defined five stage PBWE framework is realised and implemented using both existing and newly developed simulation components. The performance of the developed process is explored by comparative PBWE analyses to assess the wind-induced behaviour of two tall building designs with distinctly different cross sections; a regular rectangular cross section and an irregular „L‟-shaped cross section.
The performance of CFD was primarily dependent on the turbulence model. On the basis of an extensive validation study, the Reynolds-Averaged Navier-Stokes (RANS) model was able to adequately compute the mean pressure coefficients acting on the benchmark CAARC tall building. However, its inability to sustain the atmospheric turbulence resulted in a significant under-estimation of the top floor accelerations. Hence, it was concluded that the RANS model is not suitable for competent PBWE studies. The results showed that the Large Eddy Simulation (LES) model offered the closest alternative to wind tunnel testing. However, full LES was too computationally expensive to be used for the PBWE framework, and hence a hybrid RANS-LES simulation strategy was formulated as a compromise. This was considered to offer an appropriate representation of the wind-induced pressure field without prohibitive complexities emanating from a full LES model.

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This thesis is submitted in fulfilment of the requirements for
the degree of Doctor of Philosophy in the Department of Civil
Engineering, University of Strathclyde, Glasgow


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]]> Modelling and simulation aspects of performace-based wind engineering of tall buildings

Author(s)/Editor(s): GORDON HENRY CLANNACHAN | Size: 6,5 MB | Format: PDF | Quality: Unspecified | Publisher: University of Strathclyde, Glasgow | Year: 2012 | pages: 266

[Image: 27886353129918971830.jpg]


[Image: info.png]

The study is concerned with developing an adequate Performance-Based Wind Engineering (PBWE) framework for tall building design. The focus is to introduce advanced modelling and simulation techniques to improve key analysis stages, namely by using Computational Fluid Dynamics (CFD) and Computational Structural Mechanics (CSM). The clearly defined five stage PBWE framework is realised and implemented using both existing and newly developed simulation components. The performance of the developed process is explored by comparative PBWE analyses to assess the wind-induced behaviour of two tall building designs with distinctly different cross sections; a regular rectangular cross section and an irregular „L‟-shaped cross section.
The performance of CFD was primarily dependent on the turbulence model. On the basis of an extensive validation study, the Reynolds-Averaged Navier-Stokes (RANS) model was able to adequately compute the mean pressure coefficients acting on the benchmark CAARC tall building. However, its inability to sustain the atmospheric turbulence resulted in a significant under-estimation of the top floor accelerations. Hence, it was concluded that the RANS model is not suitable for competent PBWE studies. The results showed that the Large Eddy Simulation (LES) model offered the closest alternative to wind tunnel testing. However, full LES was too computationally expensive to be used for the PBWE framework, and hence a hybrid RANS-LES simulation strategy was formulated as a compromise. This was considered to offer an appropriate representation of the wind-induced pressure field without prohibitive complexities emanating from a full LES model.

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This thesis is submitted in fulfilment of the requirements for
the degree of Doctor of Philosophy in the Department of Civil
Engineering, University of Strathclyde, Glasgow


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]]> <![CDATA[Numerical simulation of the wind flow around a tall building and its dynamic response]]> https://forum.civilea.com/thread-52858.html Wed, 20 Apr 2016 14:27:52 +0300 bridgeengineer]]> https://forum.civilea.com/thread-52858.html Numerical simulation of the wind flow around a tall building and its dynamic response to wind excitation

Author(s)/Editor(s): Julia Revuz | Size: 23/33 MB | Format: PDF | Quality: Unspecified | Publisher: Department of Civil Engineering, Faculty of Engineering, University of Nottingham | Year: 2011 | pages: 275

[Image: 17600455794262883310.jpg]


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Wind action is particularly important for tall buildings, both in providing a significant
contribution to the dynamic overall loading on the structure and by affecting its
serviceability. Whereas low and medium-rise buildings are fairly rigid, tall structures
are characterized by a greater flexibility and a lower natural frequency, which is more
likely to be in the frequency range of wind gusts. In addition, wake effects, such as vortex
shedding, can become a significant problem for flexible structures when the vortex
shedding frequency is close to the natural frequency of the building.
The aim of the present thesis is to assess the validity of commercial CFD codes for
modelling the wind flow around a high-rise building, including the consideration of the
coupled dynamic response of the building to turbulent wind loading. Three intermediate
objectives are set.

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Thesis submitted to the University of Nottingham
for the degree of Doctor of Philosophy


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]]> Numerical simulation of the wind flow around a tall building and its dynamic response to wind excitation

Author(s)/Editor(s): Julia Revuz | Size: 23/33 MB | Format: PDF | Quality: Unspecified | Publisher: Department of Civil Engineering, Faculty of Engineering, University of Nottingham | Year: 2011 | pages: 275

[Image: 17600455794262883310.jpg]


[Image: info.png]

Wind action is particularly important for tall buildings, both in providing a significant
contribution to the dynamic overall loading on the structure and by affecting its
serviceability. Whereas low and medium-rise buildings are fairly rigid, tall structures
are characterized by a greater flexibility and a lower natural frequency, which is more
likely to be in the frequency range of wind gusts. In addition, wake effects, such as vortex
shedding, can become a significant problem for flexible structures when the vortex
shedding frequency is close to the natural frequency of the building.
The aim of the present thesis is to assess the validity of commercial CFD codes for
modelling the wind flow around a high-rise building, including the consideration of the
coupled dynamic response of the building to turbulent wind loading. Three intermediate
objectives are set.

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Thesis submitted to the University of Nottingham
for the degree of Doctor of Philosophy


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]]> <![CDATA[The Seismic Analysis of Statically Designed Tall Reinforced Concrete Buildings Using]]> https://forum.civilea.com/thread-52856.html Wed, 20 Apr 2016 12:31:55 +0300 bridgeengineer]]> https://forum.civilea.com/thread-52856.html The Seismic Analysis of Statically Designed Tall Reinforced Concrete Buildings
Using The Finite Element Method

Author(s)/Editor(s): TAHER MOKHTAR AHMED EL-KHAWANKY | Size: 65/100 MB | Format: PDF | Quality: Unspecified | Publisher: University Of Salford, Salford, UK | Year: 2003 | pages: 331
[Image: 95976243362288314718.jpg]

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Earthquakes present one of the most devastating hazards on the planet. They threaten the safety of civilians in seismically active regions, and are of extreme concern in applications that demand a high level of safety, i. e. the nuclear industry. However in nearly all cases, the fatalities that occur are as a result of the collapse of man-made structures. Hence the problems facing Civil Engineers who are concerned with seismic mitigation is evident. The dynamic behaviour of their structures must now be accounted for in the design. As our knowledge broadens, structures can, and are being designed to be earthquake resistant. However there are many buildings still standing in seismically active regions which have been designed for static load cases only, or are now of substandard design.
Seismic engineering researcha nd application has progressed rapidly over the last few decades not least in part due to the evolution of computer technology and our ability to produce computer models which aid us in the design and analysis  rocesses. Hence the research presented focuses on the global behaviour of a typical statically designed tall reinforced concrete building.

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A thesis Submitted for the degree of Doctor of Philosophy

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]]> The Seismic Analysis of Statically Designed Tall Reinforced Concrete Buildings
Using The Finite Element Method

Author(s)/Editor(s): TAHER MOKHTAR AHMED EL-KHAWANKY | Size: 65/100 MB | Format: PDF | Quality: Unspecified | Publisher: University Of Salford, Salford, UK | Year: 2003 | pages: 331
[Image: 95976243362288314718.jpg]

[Image: info.png]

Earthquakes present one of the most devastating hazards on the planet. They threaten the safety of civilians in seismically active regions, and are of extreme concern in applications that demand a high level of safety, i. e. the nuclear industry. However in nearly all cases, the fatalities that occur are as a result of the collapse of man-made structures. Hence the problems facing Civil Engineers who are concerned with seismic mitigation is evident. The dynamic behaviour of their structures must now be accounted for in the design. As our knowledge broadens, structures can, and are being designed to be earthquake resistant. However there are many buildings still standing in seismically active regions which have been designed for static load cases only, or are now of substandard design.
Seismic engineering researcha nd application has progressed rapidly over the last few decades not least in part due to the evolution of computer technology and our ability to produce computer models which aid us in the design and analysis  rocesses. Hence the research presented focuses on the global behaviour of a typical statically designed tall reinforced concrete building.

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A thesis Submitted for the degree of Doctor of Philosophy

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]]> <![CDATA[WPI – Pedestrian Bridge Study]]> https://forum.civilea.com/thread-52797.html Fri, 15 Apr 2016 20:51:56 +0300 rami1976]]> https://forum.civilea.com/thread-52797.html WPI – Pedestrian Bridge Study

Author(s)/Editor(s): James DeCelle ,Nathaniel Efron,Wilfredo Ramos Jr,Jeffrey Tully | Size: 4.6 MB | Format: PDF | Quality: Original preprint | Year: 2013 | pages: 146

[Image: 86552654715750114053.jpg]


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This project explored alternative structural solutions for a pedestrian bridge to connect the field atop of the new Parking Garage to the alleyway behind Harrington Auditorium at the Worcester Polytechnic Institute Campus. Four basic bridge types, each consisting of steel or concrete, were initially considered. Two alternatives, a steel truss bridge and a steel arch bridge, were designed in detail. A Building Information Model was generated to visualize the two alternatives. The supporting bridge structure using cast-in-place reinforced concrete for both cases was also designed.

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]]> WPI – Pedestrian Bridge Study

Author(s)/Editor(s): James DeCelle ,Nathaniel Efron,Wilfredo Ramos Jr,Jeffrey Tully | Size: 4.6 MB | Format: PDF | Quality: Original preprint | Year: 2013 | pages: 146

[Image: 86552654715750114053.jpg]


[Image: info.png]

This project explored alternative structural solutions for a pedestrian bridge to connect the field atop of the new Parking Garage to the alleyway behind Harrington Auditorium at the Worcester Polytechnic Institute Campus. Four basic bridge types, each consisting of steel or concrete, were initially considered. Two alternatives, a steel truss bridge and a steel arch bridge, were designed in detail. A Building Information Model was generated to visualize the two alternatives. The supporting bridge structure using cast-in-place reinforced concrete for both cases was also designed.

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]]> <![CDATA[A Study on Tall Buildings and AeroDynamic Modifications against Wind Excitation]]> https://forum.civilea.com/thread-51304.html Sun, 05 Jul 2015 14:18:49 +0300 TAFATNEB]]> https://forum.civilea.com/thread-51304.html A Study on Tall Buildings and AeroDynamic Modifications against Wind Excitation
Author: H.EMRE ILGIN | Size: 29.1 MB | Format: PDF | Quality: Unspecified | Year: 2006 | pages: 112

[Image: 33999129083167806515.jpg]


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The purpose of this thesis is to create basic design guidance for tall buildings and their aerodynamic modifications as a resource for architects, engineers, developers, and students. It
aims to make a contribution to and strengthen particularly the architect’s understanding of tall building design, that requires a high level of interdisciplinary approach, by providing a broad
overview of the “tall building” with its general concepts; to demonstrate the importance of human element as a critical component in the design of tall building by clarifying the wind
forces and resulting movements which cause discomfort to building occupants and create serious serviceability issues; and to show the significance of aerodynamic modifications as an effective design approach in terms of mitigating wind excitation. In order to achieve these purposes, firstly, a comprehensive literature survey, which includes the definition, emergence and
historical background, basic planning and design parameters, and lateral load considerations of tall buildings is presented. Following a structural classification of the tall buildings, wind excitation, its negative effects on occupant comfort and serviceabilty issues, and the methods to control wind excitation are studied. Finally, the significance of aerodynamic modifications against wind excitation, which include modifications of building’s cross-sectional shape and its
corner geometry, sculptured building tops, horizontal and vertical openings through-building, are presented from the scholarship on this topic.


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This post has been made by CivilEA Post-Generator v2.2.0]]> A Study on Tall Buildings and AeroDynamic Modifications against Wind Excitation
Author: H.EMRE ILGIN | Size: 29.1 MB | Format: PDF | Quality: Unspecified | Year: 2006 | pages: 112

[Image: 33999129083167806515.jpg]


[Image: info.png]

The purpose of this thesis is to create basic design guidance for tall buildings and their aerodynamic modifications as a resource for architects, engineers, developers, and students. It
aims to make a contribution to and strengthen particularly the architect’s understanding of tall building design, that requires a high level of interdisciplinary approach, by providing a broad
overview of the “tall building” with its general concepts; to demonstrate the importance of human element as a critical component in the design of tall building by clarifying the wind
forces and resulting movements which cause discomfort to building occupants and create serious serviceability issues; and to show the significance of aerodynamic modifications as an effective design approach in terms of mitigating wind excitation. In order to achieve these purposes, firstly, a comprehensive literature survey, which includes the definition, emergence and
historical background, basic planning and design parameters, and lateral load considerations of tall buildings is presented. Following a structural classification of the tall buildings, wind excitation, its negative effects on occupant comfort and serviceabilty issues, and the methods to control wind excitation are studied. Finally, the significance of aerodynamic modifications against wind excitation, which include modifications of building’s cross-sectional shape and its
corner geometry, sculptured building tops, horizontal and vertical openings through-building, are presented from the scholarship on this topic.


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This post has been made by CivilEA Post-Generator v2.2.0]]> <![CDATA[Analysis of three-dimensional tall building structures]]> https://forum.civilea.com/thread-52846.html Sun, 05 Jul 2015 13:56:23 +0300 TAFATNEB]]> https://forum.civilea.com/thread-52846.html Analysis of three-dimensional tall building structures.

Author: Khachatoorian, Hrand | Size: 8 MB | Format: PDF | Quality: Unspecified | Publisher: Glasgow Theses Service | Year: 1984 | pages: 379


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Author: Khachatoorian, Hrand | Size: 8 MB | Format: PDF | Quality: Unspecified | Publisher: Glasgow Theses Service | Year: 1984 | pages: 379


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This post has been made by CivilEA Post-Generator v2.2.0]]> <![CDATA[Analytical Studies of The Relations Among Various Design Criteria For Prestressed]]> https://forum.civilea.com/thread-51300.html Sun, 05 Jul 2015 07:26:56 +0300 RyanRS]]> https://forum.civilea.com/thread-51300.html Analytical Studies of The Relations Among Various Design Criteria For Prestressed Concrete Beams
Author: Fazlur R. Khan | Size: 4.8 MB | Format: PDF | Quality: Scanner | Year: 1955 | pages: 106

[Image: 61951109824101639241.png]


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Fazlur R. Khan Ph.D Thesis in University of Illinois

PREFACE

The studies of rectangular cross-sections reported in Chapters I-IX were carried out by Mr. Khan as a Ph.D. Thesis project in his capacity as a full-time graduate student in the Civil Engineering Department of the University of Illinois. Chapters I-IX of this report and the related figures are identical with his thesis.

The studies of the generalized unsymmetrical section and of symmetrical I-beams were made by Mr. Khan "during the Summer of 1955 while he was employed as a Research Assistant in Civil Engineering on the staff of this project. They are included in Chapters X-XII as a supplement to the original thesis.


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This post has been made by CivilEA Post-Generator v2.2.0]]> Analytical Studies of The Relations Among Various Design Criteria For Prestressed Concrete Beams
Author: Fazlur R. Khan | Size: 4.8 MB | Format: PDF | Quality: Scanner | Year: 1955 | pages: 106

[Image: 61951109824101639241.png]


[Image: info.png]

Fazlur R. Khan Ph.D Thesis in University of Illinois

PREFACE

The studies of rectangular cross-sections reported in Chapters I-IX were carried out by Mr. Khan as a Ph.D. Thesis project in his capacity as a full-time graduate student in the Civil Engineering Department of the University of Illinois. Chapters I-IX of this report and the related figures are identical with his thesis.

The studies of the generalized unsymmetrical section and of symmetrical I-beams were made by Mr. Khan "during the Summer of 1955 while he was employed as a Research Assistant in Civil Engineering on the staff of this project. They are included in Chapters X-XII as a supplement to the original thesis.


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This post has been made by CivilEA Post-Generator v2.2.0]]> <![CDATA[Seismic Performance Assessment and Probabilistic Repair Cost Analysis of Precast Conc]]> https://forum.civilea.com/thread-51292.html Sat, 04 Jul 2015 01:30:50 +0300 TAFATNEB]]> https://forum.civilea.com/thread-51292.html
Author: Hunt, Jeffrey Patrick | Size: 10.1 MB | Format: PDF | Quality: Unspecified | Publisher: University of California, Berkeley | Year: 2010 | pages: 302

[Image: 87939918918970193386.jpg]


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Analytical and experimental tests have shown that the seismic response of multistory moment-frame structures with precast concrete cladding in moderate to severe earthquakes is
significantly influenced by the cladding system. Moreover, considerable damage to the cladding system components from recent earthquakes has been reported. The cladding system can account for a significant portion of the initial cost of a building, often as much as 20%. However, inseismic analysis and design, engineers typically ignore the additional stiffness and damping thatthe cladding system may provide, which could prove to be beneficial or detrimental to the building’s seismic performance. Most of the efforts in nonlinear dynamic modeling focus on representing the behavior of structural elements and do not include the effects of non-structural elements such as cladding systems. The purpose of the research discussed in this dissertation is to study the effect that the cladding system has on the structural response of multistory buildings,
to develop analytical equations to estimate the seismic demands in the cladding connections, tocalculate the probability of failure of typical cladding connections, and to determine the postearthquakerepair costs and repair times of typical cladding systems. The nine-story LA SAC steel moment-frame building is selected as the study building,and a two-dimensional, nonlinear model is developed of the bare-frame structure in OpenSees.
The steel moment-resisting frame of the bare-frame structure is modeled using nonlinear force beam-column line elements capable of representing distributed plasticity along their length. The frame connections are reduced-beam section (RBS) moment connections, and their modeled cyclic moment-rotation behavior is based on experimental test results of the connection. Analytical models of three different precast cladding designs are applied to the bare-framestructure to study their effect on the building’s seismic response. The three cladding designs represent common systems used in regular multistory buildings in modern construction. The first
cladding design, cladding type C1, consists of alternating horizontal bands of spandrel panels (covering the exterior floor beams) and glazing. The spandrel panels extend the full width of the bay. The second cladding design, cladding type C2, consists of spandrel panels that extend the full height of the story with rectangular window openings “punched” into their surface. The third cladding design, cladding type C3, consists of the same spandrel panels as in type C1 with column cover panels spanning between adjacent spandrel panels. The force-deformation curves of the connections used in the model are obtained from experimental tests of push-pull


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Author: Hunt, Jeffrey Patrick | Size: 10.1 MB | Format: PDF | Quality: Unspecified | Publisher: University of California, Berkeley | Year: 2010 | pages: 302

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[Image: info.png]

Analytical and experimental tests have shown that the seismic response of multistory moment-frame structures with precast concrete cladding in moderate to severe earthquakes is
significantly influenced by the cladding system. Moreover, considerable damage to the cladding system components from recent earthquakes has been reported. The cladding system can account for a significant portion of the initial cost of a building, often as much as 20%. However, inseismic analysis and design, engineers typically ignore the additional stiffness and damping thatthe cladding system may provide, which could prove to be beneficial or detrimental to the building’s seismic performance. Most of the efforts in nonlinear dynamic modeling focus on representing the behavior of structural elements and do not include the effects of non-structural elements such as cladding systems. The purpose of the research discussed in this dissertation is to study the effect that the cladding system has on the structural response of multistory buildings,
to develop analytical equations to estimate the seismic demands in the cladding connections, tocalculate the probability of failure of typical cladding connections, and to determine the postearthquakerepair costs and repair times of typical cladding systems. The nine-story LA SAC steel moment-frame building is selected as the study building,and a two-dimensional, nonlinear model is developed of the bare-frame structure in OpenSees.
The steel moment-resisting frame of the bare-frame structure is modeled using nonlinear force beam-column line elements capable of representing distributed plasticity along their length. The frame connections are reduced-beam section (RBS) moment connections, and their modeled cyclic moment-rotation behavior is based on experimental test results of the connection. Analytical models of three different precast cladding designs are applied to the bare-framestructure to study their effect on the building’s seismic response. The three cladding designs represent common systems used in regular multistory buildings in modern construction. The first
cladding design, cladding type C1, consists of alternating horizontal bands of spandrel panels (covering the exterior floor beams) and glazing. The spandrel panels extend the full width of the bay. The second cladding design, cladding type C2, consists of spandrel panels that extend the full height of the story with rectangular window openings “punched” into their surface. The third cladding design, cladding type C3, consists of the same spandrel panels as in type C1 with column cover panels spanning between adjacent spandrel panels. The force-deformation curves of the connections used in the model are obtained from experimental tests of push-pull


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This post has been made by CivilEA Post-Generator v2.2.0]]> <![CDATA[Dynamic Soil-Structure-Soil-Interaction Analysis of Structures in Dense Urban Environ]]> https://forum.civilea.com/thread-51290.html Sat, 04 Jul 2015 00:25:08 +0300 TAFATNEB]]> https://forum.civilea.com/thread-51290.html Dynamic Soil-Structure-Soil-Interaction Analysis of Structures in Dense Urban Environments
Author: Jones, Katherine Carys | Size: 9.5 MB | Format: PDF | Quality: Unspecified | Year: 2013 | pages: 352

[Image: 12465951673918876794.jpg]


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Urban centers are increasingly becoming the locus of enterprise, innovation, and population. This pull toward the center of cities has steadily elevated the importance of these areas. Growth has necessarily spawned new construction. Consequently, modern buildings are often constructed alongside legacy structures, new deep basements are constructed alongside existing shallow foundations, and city blocks composed of a variety of building types result. The underlying soil, foundation, and superstructure of each of these buildings can interact and combine to yield unique seismic responses. Since the seminal work of researchers such as Luco and Contesse (1973) and Wong and Trifunac (1975), researchers have investigated the effects of soil-structure interaction (SSI). This phenomenon refers to the interaction between a single building, its foundation, and the
underlying soil during a seismic event. However, as the trend toward urbanization continues, a shortcoming of this conventional SSI approach is that in reality, a structure will almost certainly be located near other structures in metropolitan areas. In this line of research, the interaction of multiple, adjacent buildings during a seismic event, a phenomenon known as structure-soil-structure interaction (SSSI), is investigated. This topic does not yet command the level of attention given to SSI. However, SSSI has the potential to be significantly detrimental or beneficial, depending on the configuration and dynamic properties of the buildings and their foundations in dense urban environments. It is important to understand SSSI effects so that earthquake engineers can make informed decisions about the design and construction of structures in increasingly dense urban areas.


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Author: Jones, Katherine Carys | Size: 9.5 MB | Format: PDF | Quality: Unspecified | Year: 2013 | pages: 352

[Image: 12465951673918876794.jpg]


[Image: info.png]

Urban centers are increasingly becoming the locus of enterprise, innovation, and population. This pull toward the center of cities has steadily elevated the importance of these areas. Growth has necessarily spawned new construction. Consequently, modern buildings are often constructed alongside legacy structures, new deep basements are constructed alongside existing shallow foundations, and city blocks composed of a variety of building types result. The underlying soil, foundation, and superstructure of each of these buildings can interact and combine to yield unique seismic responses. Since the seminal work of researchers such as Luco and Contesse (1973) and Wong and Trifunac (1975), researchers have investigated the effects of soil-structure interaction (SSI). This phenomenon refers to the interaction between a single building, its foundation, and the
underlying soil during a seismic event. However, as the trend toward urbanization continues, a shortcoming of this conventional SSI approach is that in reality, a structure will almost certainly be located near other structures in metropolitan areas. In this line of research, the interaction of multiple, adjacent buildings during a seismic event, a phenomenon known as structure-soil-structure interaction (SSSI), is investigated. This topic does not yet command the level of attention given to SSI. However, SSSI has the potential to be significantly detrimental or beneficial, depending on the configuration and dynamic properties of the buildings and their foundations in dense urban environments. It is important to understand SSSI effects so that earthquake engineers can make informed decisions about the design and construction of structures in increasingly dense urban areas.


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