Seismic Mitigation of Curved Continuous Girder Bridge Considering Collision Effect

Zhengying Li,Shaobo Kang,Chuan You

doi:10.3390/sym14010129

Abstract

Due to structural irregularity, curved bridgesaremore likely to cause non-uniform collisions and unseating between adjacent components when subjected to earthquakes. Based on the analysis of the collision response of curved bridges duringearthquakes, and according to the seismic characteristics of curved bridges, research was carried out on pounding mitigation and unseating prevention measures. A curved bridge with double column piers was taken as an engineering example, and a finite element model of curved bridges thatcould consider the non-uniform contact collision between adjacent components was built with ABAQUS software. Viscoelastic dampers, viscous dampers, and a lead rubber bearing were selected as the damping devices, and a steel wire rope-rubber mat was used as the pounding mitigation device to form the combinatorial seismic mitigation system. Based on the principle of energy dissipation combined with constraints, three kinds of combined seismic mitigation case were determined; a seismic response analysis was then performed. The results indicated that the three kinds of combined seismic case were effective atreducing the response topounding force, stress, damage, girder torsion and displacement, and achieved the goals of seismic mitigation and unseating prevention.

Highlights

Over the past decades, curved continuous girder bridges have been widely used in transportation networks that featuregeometric restrictions and constraints on site space, such as complicated interchanges and river crossings
Research in previous studies showed that curved bridges could sustain severe damage due to the coupling between bending and torsional forces or the displacement caused by complex vibrations [1,2,3]
In order to improve the seismic performance of curved girder bridges, it is necessary to carry out further research on the reasonable combination of seismicmitigationtechnologies and pounding mitigation measures together

Summary

Introduction

Over the past decades, curved continuous girder bridges have been widely used in transportation networks that featuregeometric restrictions and constraints on site space, such as complicated interchanges and river crossings. Research in previous studies showed that curved bridges could sustain severe damage due to the coupling between bending and torsional forces or the displacement caused by complex vibrations [1,2,3] The combination of their horizontal curvature and the irregularity of their adjacent segments means that curved bridges feature complex dynamic characteristics, which cause non-uniform collisions along the contact surface [4,5]. In order to improve the seismic performance of curved girder bridges, it is necessary to carry out further research on the reasonable combination of seismicmitigationtechnologies and pounding mitigation measures together For this purpose, this paper presents acomparative numerical analysis of the impact of different combinations of unseating restrainer with different isolation bearings or dampers on the dynamic response of the curved continuous girder bridge to seismic shock. (b) gF(Fbiiitgg)uuuLdrroieenna2g2l.i.teCulCerdovrisnagFostaiis-itglssouue-endsclr.eetienivcoa2tanil.toaieConllneradov.lisamdst-ieisomnensce.itonionsnisoaolnfdsciomufrevcneusdirovbnersiddogbferciu(durgnveietd:(umbnrmidt):g. e(ma()muTnr)ai.tn:s(mva)emrTs)er. a(panr)sTovfreialrens.sev(bep)rrsLoeofipnler-o. file. (b) L

Bridge Main Structure Model

Dynamic Analysis Method and Ground Motion Input

The Number of Collisions at the Edge of Expansion Joints

Findings

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