Seismic vulnerability and recoverability Analysis of long-span cable-stayed bridges under shock-absorbing and non-shock-absorbing systems

This study compares and analyzes the seismic vulnerability and resilience of long-span cable-stayed bridges under both shock-absorbing and non-shock-absorbing systems. Taking a long-span cable-stayed bridge as an example, the 3D nonlinear finite element model of the full bridge is established by using OpenSees software. Based on incremental dynamic analysis (IDA), 10 synthetic seismic waves are selected for calculation, and the seismic response of the structure is extracted by taking the cross sections of the tower bottom and pier bottom as research objects. X-TRACT software was used for moment-curvature analysis and damage calibration of the section. The seismic vulnerability curves of the section of tower bottom and pier bottom in longitudinal and transverse are established. Based on the concept of recoverability, the seismic recoverability analysis of bridge structure is carried out, and the residual ratio curve of seismic capacity of tower bottom and pier bottom section is established and compared. The results show that the longitudinal failure probability of bridge pier is greater than that of bridge tower under the two systems. Under the shock-absorbing system, the peak acceleration (PGA) is higher when the section of tower bottom and pier bottom reaches the corresponding damage states.