Research on Seismic Performance of Single-pylon Cable-stayed Bridge Considering the Change of Constraint System
In this paper,the Dongjiang Bridge which is a single pylon cable-stayed structure and 268 m+213 m+85 m in span layout is taken as the research object,based on IDA analysis,the effect of structural system changes caused by damage of key devices under different peak seismic acceleration(PGA)on the seismic performance of the Bridge is studied,and the damage sequence and failure mechanism of key structural members under different constraint systems are further explored.Results show that,under different PGA,the failure of support will cause the change of the structural constraint system and the force transmission path,and have an important impact on the seismic performance of the structure,which is manifested as the transition from internal force response to displacement response.As the key component of force transmission of cable-stayed bridge,the bearing capacity of the support in the fixed direction should be ensured with high safety reserve and the moving direction should have sufficient allowable displacement.For the graded supports that are expected to be damaged,the normal operation of the supports under different static and dynamic loads should be ensured to avoid the significant impact of system changes on the seismic performance of the bridge structure.
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