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 - http://www.scopus.com/inward/record.url?scp=84939432806&partnerID=8YFLogxK
U2 - 10.1016/j.soildyn.2015.06.016
DO - 10.1016/j.soildyn.2015.06.016
M3 - Article
AN - SCOPUS:84939432806
VL - 78
SP - 127
EP - 141
JO - Soil Dynamics and Earthquake Engineering
JF - Soil Dynamics and Earthquake Engineering
SN - 0267-7261
ER -