Seismic analysis of motorway bridges accounting for key structural components and nonlinear soil-structure interaction

TY - JOUR

T1 - Seismic analysis of motorway bridges accounting for key structural components and nonlinear soil-structure interaction

AU - Anastasopoulos, I.

AU - Sakellariadis, L.

AU - Agalianos, A.

PY - 2015/11

Y1 - 2015/11

N2 - The paper introduces an efficient methodology to analyze the seismic performance of motorway bridges. Rigorous 3D models of a typical overpass bridge are developed and used to assess the efficiency of the proposed method. Fixed-base conditions are initially considered to focus on the effect of key structural components. The proposed simplified model is composed of a SDOF system of a pier with lateral and rotational springs and dashpots connected at the top, representing the deck and the abutment bearings. Its definition requires section analysis of the pier, and computation of spring and dashpot coefficients using simple formulas. It is shown that the lateral and rotational restraint provided by the deck and the abutment bearings is not at all negligible and should be taken into account. The simplified model is extended to account for nonlinear soil-structure interaction, replacing the soil-foundation system with horizontal, vertical, and rotational springs and dashpots. While the horizontal and vertical springs and dashpots are assumed elastic, the nonlinear rotational spring is defined on the basis of non-dimensional moment-rotation relations. The simplified model compares well with the full 3D model of the bridge-abutment-foundation-soil system, and is therefore considered a reasonable approximation.

AB - The paper introduces an efficient methodology to analyze the seismic performance of motorway bridges. Rigorous 3D models of a typical overpass bridge are developed and used to assess the efficiency of the proposed method. Fixed-base conditions are initially considered to focus on the effect of key structural components. The proposed simplified model is composed of a SDOF system of a pier with lateral and rotational springs and dashpots connected at the top, representing the deck and the abutment bearings. Its definition requires section analysis of the pier, and computation of spring and dashpot coefficients using simple formulas. It is shown that the lateral and rotational restraint provided by the deck and the abutment bearings is not at all negligible and should be taken into account. The simplified model is extended to account for nonlinear soil-structure interaction, replacing the soil-foundation system with horizontal, vertical, and rotational springs and dashpots. While the horizontal and vertical springs and dashpots are assumed elastic, the nonlinear rotational spring is defined on the basis of non-dimensional moment-rotation relations. The simplified model compares well with the full 3D model of the bridge-abutment-foundation-soil system, and is therefore considered a reasonable approximation.

KW - Bridge pier

KW - Nonlinear analysis

KW - Seismic vulnerability

KW - Soil-structure interaction

UR - https://www.scopus.com/pages/publications/84939432806

U2 - 10.1016/j.soildyn.2015.06.016

DO - 10.1016/j.soildyn.2015.06.016

M3 - Article

AN - SCOPUS:84939432806

SN - 0267-7261

VL - 78

SP - 127

EP - 141

JO - Soil Dynamics and Earthquake Engineering

JF - Soil Dynamics and Earthquake Engineering

ER -