Analytical Case Study of Seismic Performance of Retrofit Strategies for Reinforced Concrete Frames: Steel Bracing with Shear Links Versus Column Jacketing
Author: Mais M. Al-Dwaik and Nazzal S. Armouti | Size: 953 KB | Format:PDF | Quality:Unspecified | Publisher: Jordan Journal of Civil Engineering, Volume 7, No. 1, 2013 | Year: 2013 | pages: 18
The effectiveness of seismic retrofitting applied to enhance seismic performance is assessed for a five-storey reinforced concrete (RC) frame building structure as built in Jordan in mid 80s. The response of the structure is evaluated using nonlinear static and dynamic analysis with synthetic ground motion records for rock base.
FEMA 356 criteria are used to evaluate the seismic performance of the case study building. Two approaches are used for seismic evaluation: global-level evaluation (drift values) and member-level evaluation using three performance levels (immediate occupancy, life safety and collapse prevention). Based on the seismic evaluation results, two possible retrofit techniques are applied to improve the seismic performance of the structure, including the addition of RC column jackets and the addition of eccentric steel bracing. SAP 2000 is used to perform linear and nonlinear dynamic analysis, whereas plastic hinge analysis is performed by Response 2000. This study shows that adding new structural elements as steel members to an existing RC building proves to be effective in enhancing performance and reducing cost than adding RC elements. Even more, the eccentric bracing proves to outperform the column jacketing drift limit, plastic hinge limit and cost effectiveness.
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Revit® software is a Building Information Modeling (BIM) solution for structural engineering firms, providing tools specific to structural design. View images of Revit features that improve multidiscipline coordination of structural design documentation, minimize errors, and enhance collaboration among building project teams.
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evit® software provides mechanical, electrical, and plumbing (MEP) engineers with tools to design even the most complex building systems. View images to see how Revit supports Building Information Modeling (BIM), to help drive more accurate design, analysis, and documentation of efficient building systems from concept through construction.
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Behavior of high frequency modal responses in non linear seismic analysis
Author: Dhileep. M , Trivedi. A , Bose.P.R | Size: 274 KB | Format:PDF | Quality:Unspecified | Publisher: NTERNATIONAL JOURNAL OF CIVIL AND STRUCTURAL ENGINEERING Volume 1, No 4, 2011 | Year: 2011 | pages: 9 | ISBN: 0976 – 4399
Practical difficulties associated with the non linear direct numerical integration of the
equations of motion leads to the use of non linear static pushover analysis of structures.
Pushover analysis is getting popular due to its simplicity. High frequency modes and
nonlinear effects may play an important role in stiff and/or irregular structures. The
contribution of higher modes in pushover analysis is not fully developed. The behavior of
high frequency modal responses in non linear seismic analysis of structures is not known.
In this paper an attempt is made to study the behavior of high frequency modal responses
in non linear seismic analysis of structures.
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evit® software works the way architects and designers think, so you can develop higher-quality, more accurate architectural designs. View features to see how you can use architecture design tools built to support Building Information Modeling (BIM) workflows. Capture and analyze concepts, and maintain your vision through design, documentation, and construction.
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Non-linear time history analysis of tall structure for seismic load using damper
Author: Waseem Khan , Dr. Saleem Akhtar , Aslam Hussain | Size: 264 KB | Format:PDF | Quality:Unspecified | Publisher: International Journal of Scientific and Research Publications, Volume 4, Issue 4, April 2014 ISSN 2250-3153 | Year: 2014 | pages: 5
This research paper describes the results of an extensive study on the seismic behavior of a structure with damper and without damper under different earthquake acceleration frequency like EQ Altadena , EQ Lucerne, EQ Pomona, EQ Smonica and EQ Yormo. The proposed procedure is placed the dampers on the floors of the ninth-floor and five-floor of a ninth story building frame then compare the different performance of structure with damper up to Ninth-floors, damper up to Fifth-floors and without damper of ninth-story building frame using SAP2000 V15. As per IS1893 2002 non-linear time-history analyses of frame structure indicate that maximum displacement, maximum base shear and maximum acceleration effectively reduce by providing the damper in building frame from base support to fifth- floor and base support to ninth-floor comparison to as usual frame.
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NON LINEAR SEISMIC ANALYSIS OF ANCIENT BUILDINGS Structural Characterization for Successful Seismic Retrofit
Author: Diogo Filipe de Sousa Micael Pereira | Size: 364 KB | Format:PDF | Quality:Unspecified | Publisher: Department of Civil Engineering and Architecture – Instituto Superior Técnico – Universidade Técnica de Lisboa | pages: 11
Society’s social and cultural awareness for the importance of historic buildings is leading to a generalized effort for
preservation. Most ancient buildings desperately need retrofit in order to mitigate the effects of material aging, of intensive use
and of the pathologies resultant from natural disasters. The systemization of seismic retrofitting is the expected course of action. In Portugal, the implementation of the Eurocodes represents the first step towards the regulation of seismic retrofit of ancient wood and masonry buildings and it is being accompanied by the recovery of traditional constructive techniques, In the first part of this paper, a structural characterization of ancient buildings is established by studying its material properties, its building systems and its failure mechanisms. Afterwards, the most common strengthening methodologies are reviewed, specifying its employability according to its purpose’s fulfilment. For a successful design of seismic strengthening, the proceeding ought to be based on experimental and numerical studies. Thus, this paper mainly focuses on the assessment of ancient buildings’ non linear behaviour. Therefore, in the second part of
this paper, two walls of a 19th Century building in the city of Catania are idealized into equivalent frames. The numerical models designed are submitted to a non linear Static Pushover Analysis and to a non linear Incremental Dynamic Analysis.
The main purpose is to contribute to the development and discloser of a numerical model to easily and efficiently perform
non linear static and dynamic analyses of ancient masonry buildings, on current software (SAP2000 ®). The strengthening
design ought to be based on this sort of analyses.
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This is the third volume of a handbook which covers the whole field of soil mechanics, discussing deterministic and stochastic theories and methods, and showing how they can be used in conjunction with one another. The first volume discusses soil physics, while the second deals with the determination of physical characteristics of the soil. Australian Mining wrote of the Handbook ``a valuable addition to the extensive literature on the topic and will be found to be more useful than most.''
The main objective of the third volume is to present solutions to the problems of engineering practice. It deals with the most important theoretical and practical problems of soil mechanics, discussing the following in detail: stability of earthworks, load-bearing capacity and settlement of shallow foundations, design of pile foundations, soil mechanics in road construction, improving the physical properties of soils, the characteristics of soil dynamics, foundations for machines and soil behaviour as affected by earthquakes. The book not only presents up-to-date deterministic methods, but also discusses solutions of probability theory in the fields of design and safety.
The book is divided into six chapters covering the stability of slopes, landslides, load-bearing capacity and settlement of shallow foundations and pile foundations, soil mechanics in road construction, and the improvement of the physical characteristics of soil with special emphasis on machine foundations and earthquakes, giving detailed treatment of each subject. For example, the first chapter deals not only with the stability of slopes, but also discusses the natural and artificial effects, slope protection, filter design, stresses in embankments, and the time factor. In this way, the book gives a clear and comprehensive picture of the special fields of soil mechanics and its subjects. It is therefore emminently suitable for postgraduate engineers, and engineers working in the fields of geotechnics, earthworks, foundations, road construction, engineering geology and statistics, and the design of structures.
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This uniquely exhaustive 2-volume compilation of problems encountered in the daily practice of soil mechanics and foundation engineering is a must for students and geotechnical engineers alike. It contains detailed solutions to more than 150 typical problems, clearly illustrated with numerous diagrams and drawings, and graded according to difficulty. All problems are real-life examples taken from the authors' own experience and covering the whole range of soil mechanics and foundation engineering sub-fields. For practising geotechnical and civil engineers, it is an invaluable guide and reference, while specialists in soil mechanics will find answers to problems which are rarely to be found in the technical literature.
Volume 1
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Volume 2
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Maths for Geoscientists is an accessible, student-friendly introduction to the essential mathematics required by those students taking degree courses within the Geosciences. Clearly structured throughout, this book carefully guides the student step by step through the mathematics they will encounter and will provide numerous applied examples throughout to enhance students understanding and to place each technique into context.
Opening with a chapter explaining the need for studying mathematics within geosciences the book then moves on to cover algebra, equations, solutions, logarithms and exponentials, statistics and probability, trigonometry, vectors and calculus. The final chapter helps to bring it all together and provides the students with sample projects to test their knowledge. Worked applied examples are included in each chapter along with applied problem questions which are a mix of straightforward maths questions, word questions (developing maths to words), and more involved questions that involve the manipulation and interpretation of real and synthetic data.
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