Research on Improvement of Seismic Vulnerability of Cable-stayed Bridge by Friction Pendulum Support
In order to study the effect of sliding friction pendulum isolation on the seismic performance of cable-stayed bridges,the models of cable-stayed bridges with ordinary supports and with sliding friction pendulum isolation are respectively established by Opensees.The seismic vulnerability curves of the two structures are compared and analyzed,and the seismic performance of the isolated cable-stayed bridge is evaluated from the perspective of seismic vulnerability.Taking into account the frictional pendulum slip bearing,the probability of all kinds of failure increases significantly under seismic load,and the probability of different failure forms is very close.With the increase of PGA,the probability of different forms of failure of cable-stayed bridge supports increases obviously under the lateral seismic load,considering the influence of frictional pendulum slip supports.Meanwhile,the probability of different forms of failure of all supports is very close and the change law is roughly the same.It is found that compared with cable-stayed bridges with common sliding bearings,the vulnerability of piers and towers in longitudinal and transverse bridge direction is significantly improved.The probability of severe damage and complete destruction of piers and tower components is close to zero,indicating that friction pendulum supports can effectively dissipate seismic energy and protect the main structure.
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