Seismic Responses of Cable-Stayed Bridge Considering Ponding Effect under Near-Fault Ground Motions
To study the influence of the ponding effect on seismic responses of the cable-stayed bridge under near-fault ground motions,taking a double-tower cable-stayed bridge as the engineering background,this paper analyzed the ponding response of the main bridge and the main beam of the approach bridge of the cable-stayed bridge under near-fault ground motions and the influence of the ponding response on the structural seismic response.Besides,the influence of viscous dampers and elastic cables on the ponding effect of the cable-stayed bridge under near-fault ground motions was studied,which was compared with the seismic response of the cable-stayed bridge under far-fault ground motions to discuss the influence of the ponding effect on the seismic mitigation rate of the cable-stayed bridge.The results show that compared with non-pulse ground motions,under near-fault pulse-type ground motions,the main bridge and approach bridge of the cable-stayed bridge are more likely to collide within the pulse period,and the influence of the ponding effect on the seismic response of the cable-stayed bridge is more significant.When viscous dampers and elastic cables are installed,the main bridge and approach bridge still collide within the pulse period,but the ponding response decreases.Besides,the influence of the ponding effect on seismic responses of the cable-stayed bridge under pulse-type ground motions is significantly reduced,and the ponding effect should be considered when the seismic mitigation rate of the cable-stayed bridge under pulse-type ground motion is analyzed.
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