000010070 001__ 10070
000010070 005__ 20141205154142.0
000010070 04107 $$aeng
000010070 046__ $$k2008-10-12
000010070 100__ $$aGhalibafian, Houman
000010070 24500 $$aEffects of Nonlinear Soil-Structure Interaction on the Inelastic Seismic Demand of Pile-Supported Bridge Piers

000010070 24630 $$n14.$$pProceedings of the 14th World Conference on Earthquake Engineering
000010070 260__ $$b
000010070 506__ $$arestricted
000010070 520__ $$2eng$$aThe significance of the effects of soil-structure interaction (SSI) on the seismic performance of structures is not yet clearly understood. This is attributed to the complex nonlinear nature of SSI and the lack of sufficient statistical description of its effects on the seismic response of structures. In this regard, this paper presents a study on the effects of nonlinear SSI on the inelastic seismic demand of bridge piers by comparing the flexiblebase and fixed-base seismic demands of prototype pile-supported bridge piers. The prototype system comprised a common highway bridge pier supported on a pile group. The height of the pier and the thickness of the site soil layer were varied to provide first mode fixed-base structural periods of 0.3 to 2.0 s and first mode site periods (at low amplitude of motion) of 0.6, 1.0 and 2.0 s. An ensemble of 26 ground motions recorded on rock or stiff soil was selected and applied at the bottom of the soil layers. The numerical models for nonlinear dynamic analyses included the site soil, the foundation and the pier, and were developed with the commercial finite difference program FLAC. This paper discusses the effects of SSI on ductility and total displacement demands of the piers. It also investigates the accuracy of the nonlinear static pushover analysis for demand estimation of pile-supported bridge piers. It was observed that where SSI is significant, pushover analysis may overestimate the base shear of the piers and the global ductility factor may overestimate their ductility demand. KEYWORD:

000010070 540__ $$aText je chráněný podle autorského zákona č. 121/2000 Sb.
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000010070 7112_ $$a14th World Conference on Earthquake Engineering$$cBejing (CN)$$d2008-10-12 / 2008-10-17$$gWCEE15
000010070 720__ $$aGhalibafian, Houman$$iVentura, Carlos E.$$iFoschi, Ricardo O.
000010070 8560_ $$ffischerc@itam.cas.cz
000010070 8564_ $$s227310$$uhttps://invenio.itam.cas.cz/record/10070/files/05-01-0420.pdf$$yOriginal version of the author's contribution as presented on CD, Paper ID: 05-01-0420.
000010070 962__ $$r9324
000010070 980__ $$aPAPER