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Title of Journal: KSCE J Civ Eng

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Abbravation: KSCE Journal of Civil Engineering

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Korean Society of Civil Engineers

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DOI

10.1007/978-3-8349-4397-2_4

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1976-3808

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Effects of foundation soil stiffness on the 3D mo

Authors: Mouloud Ouanani Boualem Tiliouine
Publish Date: 2014/12/01
Volume: 19, Issue: 4, Pages: 1009-1023
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Abstract

This paper presents the main results of an investigation into the influence of foundation soil stiffness on the modal characteristics and seismic response of a highway bridge with spread foundations A sensitivity study including six types of soil profiles is first performed to examine the effects of foundation soil stiffness on critical dynamic response parameters of the bridge 3D modal characteristics of lateral vertical longitudinal and torsional vibrations modes are identified and compared for various soil and rock conditions The study is then extended to estimate the time history nonlinear seismic response of coupled foundation soilbridge models utilizing an extension of the Fast Nonlinear Analysis FNA algorithm Two different approaches for modeling soil foundation interaction are considered a PGA consistent linear soil model and an advanced non linear soil model Results show among others the major influence of soil flexibility effects on the modal characteristics and seismic response behavior of the bridge Moreover the results illustrate clearly the importance of soil nonlinearity on coupled foundation soilbridge response It follows from a design perspective that analytical models used for the seismic analysis of bridge structures should explicitly consider the effects of soilstructure interaction including nonlinear soil behavior

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