Modal pushover analysis as a tool for evaluation and design of irregular frames
info:
This paper investigates the application of modal pushover analysis (MPA) as a tool to estimate seismic demands of
structures with irregular mass distribution. A set of 20 ground motions is selected and median peak values of interstory
drift ratios, story shears and overturning moments obtained with MPA are compared with results of nonlinear time
history analysis (NL-THA). It is concluded that modal pushover analysis can be used to estimate seismic demands for
practical applications in evaluation and design of frames with mass irregularity.
Keywords: Modal pushover; Mass irregularity; Pushover analysis; Nonlinear time history analysis; Higher modes;
Incremental dynamic analysis; Seismic response
An Incremental Response Spectrum Analysis Procedure Based on Inelastic Spectral Displacements for Multi-Mode Seismic Performance Evaluation
info:
The so-called Nonlinear Static Procedure (NSP) based on pushover analysis has been developed
in the last decade as a practical engineering tool to estimate the inelastic response quantities
in the framework of performance-based seismic evaluation of structures. However NSP suffers from
a major drawback in that it is restricted with a single-mode response and therefore the procedure can
be reliably applied only to the two-dimensional response of low-rise, regular buildings. Recognizing
the continuously intensifying use of the pushover-based NSP in the engineering practice, the present
paper attempts to develop a new pushover analysis procedure to cater for the multi-mode response
in a practical and theoretically consistent manner. The proposed Incremental Response Spectrum
Analysis (IRSA) procedure is based on the approximate development of the so-called modal capacity
diagrams, which are defined as the backbone curves of the modal hysteresis loops. Modal capacity
diagrams are used for the estimation of instantaneous modal inelastic spectral displacements in a
piecewise linear process called pushover-history analysis. It is illustrated through an example analysis
that the proposed IRSA procedure can estimate with a reasonable accuracy the peak inelastic
response quantities of interest, such as story drift ratios and plastic hinge rotations as well as the
story shears and overturning moments. A practical version of the procedure is also developed which
is based on the code-specified smooth response spectrum and the well-known equal displacement
rule.
A unified formulation of the piecewise exact method for inelastic seismic demand analysis including the P-delta effect
info:
The non-linear analysis of single-degree-of-freedom (SDOF) systems provides the essential background
information for both strength-based design and displacement-based evaluation=design methodologies
through the development of the inelastic response spectra. The recursive solution procedure called the
piecewise exact method, which is effciently used for the response analysis of linear SDOF systems,
is re-formulated in this paper in a uniffed format to analyse the non-linear SDOF systems with multilinear
hysteresis models. The uniffed formulation is also capable of handling the P-delta effect, which
generally involves the negative post-yield stiffness of the hysteresis loops. The attractiveness of the
method lies in the fact that it provides the exact solution when the loading time history is composed
of piecewise linear segments, a condition that is perfectly satisffed for the earthquake excitation. Based
on simple recursive relationships given for positive, negative and zero effective stiffnesses, the uniffed
form of the piecewise exact method proves to be an extremely powerful and probably the best tool for
the SDOF inelastic time-history and response spectrum analysis including the P-delta effect..
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Authors: Andrew Schofield, Peter Wroth
Edition: Illustrated
Publisher: McGraw-Hill, 1968
ISBN: 0641940483, 9780641940484
Pdf: 5.6 Mb
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Authors: Clayton C. R. I., Matthews M.C., Simons N.E.
Edition: 2, Illustrated
Publisher: Blackwell Science, 1995
ISBN: 0632029080, 9780632029082
Pdf: 11.9 Mb
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DEVELOPMENT AND VERIFICATION OF A FULLY ADAPTIVE PUSHOVER PROCEDURE
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Inelastic static pushover analysis of structural systems subjected to earthquake loading is rapidly gaining ground as a tool for design and assessment. Whereas the potential of such methods is recognised, especially in contrast with force-based elastic analysis, there have been concerns over their reliability in predicting correctly the inelastic seismic demands....
Dictionary of Architecture and Building Construction
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Nikolas Davies, Erkki Jokiniemi "Dictionary of Architecture and Building Construction"
Architectural Press : 2008-07-23
ISBN: 0750685026
736 pages |
PDF - 23,8 MB
The most extensive and comprehensive dictionary for architects and construction professionals
With more than 20,000 words and terms individually defined, the Dictionary offers huge coverage for anyone studying or working in architecture, construction or any of the built environment fields.
The innovative and detailed cross-referencing system allows readers to track down elusive definitions from general subject headings. Starting from only the vaguest idea of the word required, a reader can quickly track down precisely the term they are looking for.
The book is illustrated with stunning drawings that provide a visual as well as a textual definition of both key concepts and subtle differences in meaning.
Davies and Jokiniemi's work sets a new standard for reference books for all those interested in the buildings that surround us.
* Comprehensive coverage of architecture and building terms
* Detailed and innovative cross-referencing system
* Beautifully illustrated with detailed technical drawings
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Author: David Rayner Hunkin Jones
Edition: Illustrated
Publisher: Gulf Professional Publishing, 2001
ISBN: 0080439594, 9780080439594
Length: 444 pages
Pdf: 12.2 Mb
The first book of Failure Analysis Case Studies selected from volumes 1, 2 and 3 of the journal Engineering Failure Analysis was published by Elsevier Science in September 1998. The book has proved to be a sought-after and widely used source of reference material to help people avoid or analyse engineering failures, design and manufacture for greater safety and economy, and assess operating, maintenance and fitness-for-purpose procedures. In the last three years, Engineering Failure Analysis has continued to build on its early success as an essential medium for the publication of failure analysis cases studies and papers on the structure, properties and behaviour of engineering materials as applied to real problems in structures, components and design.
Failure Analysis Case Studies II comprises 40 case studies describing the analysis of real engineering failures which have been selected from volumes 4, 5 and 6 of Engineering Failure Analysis. The case studies have been arranged in sections according to the specific type of failure mechanism involved. The failure mechanisms covered are overload, creep, brittle fracture, fatigue, environmental attack, environmentally assisted cracking and bearing failures. The book constitutes a reference set of real failure investigations which should be useful to professionals and students in most branches of engineering.
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