Seismic resilience assessment method for girder bridges:I.Expert opinion-based post-earthquake functionality recovery models of bridge components
Girder bridge is the most widespread type of bridges in the transport road network in China.The reliable seismic resilience assessment method for these bridges is a crucial demand for China's national development agenda of Resilient Cities and Countries.However,the functionality recovery models of bridge components,which is vital to the seismic resilience assessment,haven't been established.The post-earthquake functionality recovery models may characterize the loss,maintaining and recovery of the structural functionality against an earthquake.To fill the gap,the first part of this study is devoted to developing the functionality recovery models for bridge components using an expert opinion-based survey approach.First,multi-level damage states of individual components of girder bridges are defined.These concerned components include the primary ones in the bridge support system(including pier,girder,bearing,foundation,and abutment)and the secondary ones(including shear key,and expansion joint).Accordingly,by consulting 124 experts in the fields of design,research,construction,inspection,maintenance and retrofitting in China,comprehensive surveys on the post-earthquake traffic strategy of bridge,residual traffic functionality,decision-making time,component recovery strategy and time,and residual traffic functionality of bridge during the component recovery,are conducted for individual components at individual damage states.Finally,the post-earthquake functionality recovery models for individual components of girder bridges are developed based on statistical analyses.The second part of this study is devoted to these recovery models of assessing the seismic resilience of widespread typical unbonded laminated rubber bearing(ULRB)-supported girder bridges in China.
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