The Two-dimensional Seismic Fragility Analysis of the Offshore Bridge in Considering the Seismic Correlation between Different Components
In order to evaluate the seismic performance of the offshore bridge in China,the two-dimensional seismic fragility analysis of the offshore simply supported beam bridge in considering the chloride ion erosion is conducted in this paper.Taking a concrete bridge in the offshore tidal environment as an example,the adverse effects the chloride ion erosion on structure are investigated.The seismic response of bridge structure is simulated based on the IDA method.The appropriate damage indexes of plate rubber bearing and pier are selected,and seismic fragility curves are obtained.The internal correlation mechanism of seismic responses between two com-ponents is revealed,and the correlation coefficients between different components are proposed based on the correlation analysis meth-od.Finally,the reasonable two-dimensional seismic fragility curves of the bridge structure are achieved.The results show that the cor-relations of the seismic demand and seismic capacity between plate rubber bearings and piers are significant,and the two-dimensional seismic fragility curves based on the correlation of different components can more comprehensively evaluate the seismic performance of the bridge structure.Our results are helpful in providing scientific basis and technical support for seismic design and seismic risk assess-ment of offshore bridges.
Offshore bridgeChloride ion erosionIDA methodComponent seismic correlationTwo-dimensional seismic fragility analysis
万方数据
维普
