SHEAR WALL WITH OUTRIGGER TRUSSES ON WALL AND COLUMN FOUNDATIONS
Author: J. C. D. HOENDERKAMP | Size: 169 KB | Format:PDF | Quality:Unspecified | Publisher: J. C. D. HOENDERKAMP | Year: 2004 | pages: 15
A graphical method of analysis is presented for preliminary design of outrigger truss-braced high-rise shear wall
structures with non-fixed foundation conditions subject to horizontal loading. The method requires the calculation
of six structural parameters: bending stiffness for the shear wall, bending and racking shear stiffnesses for
the outrigger, an overall bending stiffness contribution from the exterior columns, and rotational stiffnesses for
the shear wall and column foundations.
The method of analysis employs a simple procedure for obtaining the optimum location of the outrigger up
the height of the structure and a rapid assessment of the influence of the individual structural elements on the
lateral deflections and bending moments of the high-rise structure. It is concluded that all six stiffnesses should
be included in the preliminary analysis of a proposed tall building structure as the optimum location of the outrigger
as well as the reductions in horizontal deformations and internal forces in the structure can be significantly
influenced by all the structural components.
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This paper presents results from an international research project devoted to evaluating the seismic performance
of a three-storey steel frame structure equipped with a friction-damping device (FDD) recently developed at the
Technical University of Denmark. Experimental results indicate that the FDD performed very well in reducing
the lateral storey drifts of the test frame. Numerical simulation of the seismic response of the primary and
friction-damped frame was also conducted. This paper also compares the predictions of the displacement demand
from the test results with those obtained by the capacity spectrum method.
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OPTIMIZED USE OF THE OUTRIGGER SYSTEM TO STIFFEN THE COUPLED SHEAR WALLS IN TALL BUILDINGS
Author: NAVAB ASSADI ZEIDABADI , KAMAL MIRTALAE AND BARZIN MOBASHER | Size: 250 KB | Format:PDF | Quality:Unspecified | Publisher: NAVAB ASSADI ZEIDABADI , KAMAL MIRTALAE1 AND BARZIN MOBASHER | Year: 2004 | pages: 19
Based on the conventional yet accurate continuum approach, a general analysis is presented for a pair of coupled
shear walls, stiffened by an outrigger and a heavy beam in an arbitrary position on the height. Subsequently, a
parametric study is presented to investigate the behavior of the structure. The optimum location of the outrigger
and the parameters affecting its position were also investigated. The results showed that the behavior of the structure
can be significantly influenced by the location of the outrigger. It was also indicated that in most ordinary
cases the best location of the structure to minimize top drift is somewhere between 0·4 to 0·6 of the height of the
structure. Though this method is not a substitute for the finite element method, it gives an initial simple solution
to determine the size and position of outrigger, stiffening beam and coupled shear walls in the preliminary design
stages.
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ON MODELLING OF TYPHOON-INDUCED NON-STATIONARY WIND SPEED FOR TALL BUILDINGS
Author: J. CHEN AND Y. L. XU | Size: 1.74 MB | Format:PDF | Quality:Unspecified | Publisher: J. CHEN AND Y. L. XU | Year: 2004 | pages: 19
Typhoon-induced wind around tall buildings may not be stationary because it is a large body of rotating air. A
new approach is thus proposed in this paper for characterizing typhoon-induced wind speed. Typhoon-induced
non-stationary wind speed is modelled as a deterministic time-varying mean wind speed component plus a zero
mean stationary fluctuating wind speed component. The time-varying mean wind speed is naturally extracted
from the measured wind speed time history using empirical mode decomposition (EMD). Wind characteristics
described in the traditional approach based on a stationary wind model are redefined and extended in the nonstationary
wind model. The new approach is then applied to wind data measured at the Di Wang building during
Typhoon York. The results show that most of recorded wind samples are non-stationary but they can be decomposed
into a time-varying mean wind speed component plus a well-behaved zero mean fluctuating wind speed
component admitted as a stationary random process with Gaussian distribution. Other wind characteristics such
as probability distribution of fluctuating wind speed, turbulence intensity, gust factor, and wind spectrum obtained
by the new approach seem to be more realistic than those gained by the traditional approach.
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Author: Brian W. Smith | Size: 17 MB | Format:PDF | Quality:Scanner | Publisher: Thomas Telford Ltd | Year: 2007 | pages: 352 | ISBN: 9780727734006
“engineers working in the fields of design, analysis, fabrication and construction of masts and/or towers will accomplish their tasks with confidence by consulting this book”
- Mamoru Kawaguchi, President of IASS
This book combines the accumulated knowledge of structural engineers, scientific researchers, mast and tower owners and antenna experts with experience in the analysis, design, construction and operation of communication structures, into one accessible volume.
It introduces the reader to the basis of design, analysis and construction of lattice towers and guyed masts used for communication purposes (radio, television, mobile phones and radar) and looks at new developments and the effects on the industry. The author focuses on the light and wind sensitive structures that support the aerials that make communication services possible and states that the design and construction of these structures involves significant engineering expertise to ensure that they are safe and reliable, yet cost effective and efficient.
A brief history of tall structures is provided and the various types of structure, dictated by their function and/or location are described. The loading on such structures is described and the methods of calculating their response outlined. Dynamic effects from vortex shedding or galloping are outlined, together with detailed guidance on how to minimise these effects and how to assess fatigue life.
The book provides detailed information on:
history, design considerations and failures
meteorological parameters, wind resistance and strength
aerodynamic stability, fatigue, access and safety
codes of practice and design standards.
Communication structures is essential for both the established and the new generation of engineers, telecom administrators, contractors, masts and tower fabricators and related professionals.
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Full title:Linear Analysis of Skeletal Structures
Author: David Johnson
Publisher: Thomas Telford Ltd
Page Size: 297x210mm
Number of Pages: 288
Description
Linear Analysis of Skeletal Structures meets the demands of a typical prominent structural engineering educator who aims to: "teach students how to model, how to use computer packages in real contexts, to validate models, verify results and carry out parameter studies. Hand analysis is now only for very simple problems and for back-of-envelope checks".
The checks referred to are usually statically based and it is therefore presumed that the reader has a firm background in statics. This unique book principally:
tackles statically indeterminate structures
replaces traditional hand analysis teaching of indeterminate structures by a workbook format approach based on qualitative and quantitative (computer analysis) studies
provides comprehensive coverage of the behavior of skeletal structures - beams, plane trusses arches, plane frames, space trusses, grids and space frames
uses case studies to provide experience of, using computer packages in real contexts; worksheets to develop qualitative understanding; and computer based problems to carry out parameter studies
emphasises computer modeling and the validation of computer models and solutions.
A workbook approach is used with individual chapters covering fundamentals, beams, plane trusses, arches, plane frames, space trusses, grids, and space frames. Each chapter describes the fundamental behavior of a particular structural form, which is supplemented by qualitative examples and problems.
The book will make essential reading for all levels of structural, civil, mechanical and aerospace engineers. The book will be an invaluable aid for all students of structural and civil engineering, from the later years of an undergraduate course through to postgraduate work and the early stages of graduate training within the field.
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Full title:Steel-Concrete Composite Buildings
Author:D. Collings
Publisher: Thomas Telford Ltd
Page Size: 246x189mm
Number of Pages: 240
Description
A concise and accessible guide to the practical and economical design of composite buildings, Steel-Concrete Composite Buildings employs the latest methods as outlined in Eurocodes and includes up-to-date examples of the uses of composite construction in buildings in the UK, US, Asia and other parts of the world.
The book covers a wide range of structures, from simple beam and slab structures through to problems associated with composite construction in high rise structures, and specialist problems such as dynamics. Showing how composite structures may be designed simply from basic concepts without the need for a clause by clause checking of codes and standards, all chapters use real world examples of buildings from around the globe to illustrate design and construction methods. Test results are used extensively to demonstrate the behaviour of the structure being designed, helping to clarify the limitations of the codes.
The essential reference for those engaged in design of composite structures, Steel-Concrete Composite Buildings will provide readers not only with simpler methods for design and construction but also a deeper understanding of these methods and how they are verified against the latest design codes.
Civil and structural engineers worldwide will find this book a timely and highly useful practical guide to this important area of design and construction.
This book is a companion to Steel-Concrete Composite Bridges, also by David Collings.
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We transferred CivilEA to new server, we are extremely sorry for shutting down website suddenly. This was unmanaged issue.
Because of new year holidays we forced to do transferring yesterday by our provider this is why we shut down site without any announcement.
Anyway we hope you accept our apologize for this issue.
You may see some errors in next few days. This is normal. We are working hard to finalize transferring.
Predicting the In-plane Capacity of Masonry Infilled Frames
Author: Charles J. Tucker | Size: 8 MB | Format:PDF | Quality:Unspecified | Publisher: Tennessee Technological University | Year: 2007
Stiffness methods from eighteen sources were investigated. Strength methods from thirteen sources were also investigated. The stiffness equations were compared to the experimental data at the first crack load. The strength equations were compared to the experimental results at the first crack load and the reported ultimate load. The results of these comparisons were used as a starting point for the development of better equations for determining the stiffness and strength of masonry infilled frames.
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Behavior of geosynthetic reinforced soil walls with poor quality backfills on yielding foundations
Author: Saidin Fadzilah | Size: 20 MB | Format:PDF | Quality:Unspecified | Publisher: University of Washington | Year: 2007
This thesis is a study of the behavior of GRS walls with poor quality backfill on yielding foundations with the goal of contributing towards a rational design of these walls. The research consisted of numerical simulation of a GRS wall constructed using poor quality backfill on a compressible foundation. The results were compared to an equivalent full scale instrumented wall. Parametric analyses were performed to study the effect of varying some important parameters on the wall response. The impact of water was studied by modeling the effect of a wetting front advancing into the fill due to infiltration of water through a two-phase flow analysis. Findings from this research show that GRS walls using poor quality backfills on a yielding foundation can be designed using current methods used for granular backfills but adequate provision for drainage is critical. A reinforced base is essential to spread the load onto the yielding foundation. Permeable reinforcements are not effective in reducing the generation of excess pore pressure due to infiltration for backfills compacted dry of optimum.
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