Analysis of Seismic Damage to Multiple-Frame Style Curved Girder Bridge

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Journal of Vibration and Shock ›› 2016, Vol. 35 ›› Issue (20) : 111-118.

WU Tong1,2, SUN Quan-sheng1

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Abstract

In order to study multiple-frame style curved girder bridge with hinges, a nonlinear dynamic model of this kind of bridge is established by OpenSees program, the seismic response of the bridge is researched by nonlinear time history analysis. The impact of the form of structural arrangement and mass moment of inertial on girder to the overall vibration process of frames and the damage degree of columns is discussed. And the failure form of abutment bearing is studied through elastoplastic shear failure model of rubber bearing. The research results indicate that: under earthquake load, frames belongs to unsymmetrical multiple-frame style curved girder bridge vibrate inconsistently, the seismic response on the top and the bottom of shorter columns on both sides of bridge is largest, and this response can easily make the steels here yield, the rubber bearing at the abutment is possible to fail because of the large longitudinal shear deformation. It is beneficial for frames to vibrate together when the height of columns is symmetric arrangement. Mass moment of inertial on girder influences the transverse seismic damage of longer column greatly.

Key words

multiple-frame style / seismic damage / hinge / shear failure model / OpenSees / time history analysis

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WU Tong1,2, SUN Quan-sheng1. Analysis of Seismic Damage to Multiple-Frame Style Curved Girder Bridge[J]. Journal of Vibration and Shock, 2016, 35(20): 111-118

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