Seismic resilience assessment of unbonded rubber-bearing supported girder bridges
The seismic resilience assessment for the widespread unbonded laminated rubber bearing supported highway girder bridge in China is carried out.Firstly,seismic resilience assessment framework for bridges is introduced,which includes the finite element modeling for the bridge considering nonlinearity,the seismic fra-gility curve towards resilience assessment,and seismic resilience assessment.Secondly,the nonlinear finite el-ement model of a typical laminated rubber bearing supported girder bridge is generated in OpenSees,and the incremental dynamic analysis(IDA)is performed.The damage state of the bridge is defined according to the residual displacement and peak displacement of the unbonded laminated rubber bearing.The seismic fragility curve of the bridge is obtained.Then,the functionality recovery curve of the bridge at a given peak ground acceleration(PGA)is generated by combining the failure probability and the restoration model of the bridge at the individual damage state.Finally,taking an equivalent downtime of the bridge as the seismic resilience in-dex,the seismic resilience curve of the bridge varying with the PGA is obtained.The results show that the seismic resilience of the bridge declines rapidly when PGA increases from 0.6g to 1.0g,and the equivalent downtime of the bridge increases from 15 to 58 d.
bridge engineeringseismic resilienceunbonded laminated rubber bearingfragility curvefunctionality recovery curveresilience index
万方数据
维普
