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| Titel |
Effectiveness of modified pushover analysis procedure for the estimation of seismic demands of buildings subjected to near-fault ground motions having fling step |
| VerfasserIn |
A. Mortezaei, H. R. Ronagh |
| Medientyp |
Artikel
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| Sprache |
Englisch
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| ISSN |
1561-8633
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| Digitales Dokument |
URL |
| Erschienen |
In: Natural Hazards and Earth System Science ; 13, no. 6 ; Nr. 13, no. 6 (2013-06-19), S.1579-1593 |
| Datensatznummer |
250018502
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| Publikation (Nr.) |
 copernicus.org/nhess-13-1579-2013.pdf |
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| Zusammenfassung |
| Near-fault ground motions with long-period pulses have been identified as
being critical in the design of structures. These motions, which have caused
severe damage in recent disastrous earthquakes, are characterized by a
short-duration impulsive motion that transmits large amounts of energy into
the structures at the beginning of the earthquake. In nearly all of the past
near-fault earthquakes, significant higher mode contributions have been
evident in building structures near the fault rupture, resulting in the
migration of dynamic demands (i.e. drifts) from the lower to the upper
stories. Due to this, the static nonlinear pushover analysis (which utilizes
a load pattern proportional to the shape of the fundamental mode of
vibration) may not produce accurate results when used in the analysis of
structures subjected to near-fault ground motions. The objective of this
paper is to improve the accuracy of the pushover method in these situations
by introducing a new load pattern into the common pushover procedure.
Several pushover analyses are performed for six existing reinforced concrete
buildings that possess a variety of natural periods. Then, a comparison is
made between the pushover analyses' results (with four new load patterns)
and those of FEMA (Federal Emergency Management Agency)-356 with reference to nonlinear dynamic time-history
analyses. The comparison shows that, generally, the proposed
pushover method yields better results than all FEMA-356 pushover analysis
procedures for all investigated response quantities and is a closer match to
the nonlinear time-history responses. In general, the method is able to
reproduce the essential response features providing a reasonable measure of
the likely contribution of higher modes in all phases of the response. |
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