Effects of near-fault pulse-type ground motions on long-span cable-stayed bridge
ZHANG Fan1,2, LI Shuai1,2, YAN Xiaowei3, WANG Jingquan1,2
1. Key Laboratory of Concrete and Prestressed Concrete Structure of China Ministry of Education, Nanjing 210096, China
2. National Prestress Engineering Research Center, Nanjing 210096, China
3. Shanghai Municipal Planning Design Research Institute, Shanghai 200040, China
Abstract：The objective of this study is to determine the seismic responses of Sutong cable-stayed bridge taking into account near-fault pulse-type effect and soil-structure interaction effect(SSI). Systematic lumped-parameter models are used to describe the dynamic behavior of the foundation supported on soil. The dynamic finite element model of the bridge considering SSI effect is established. The seismic responses of the towers and deck subjected to three pulse-type ground motions, i.e. Forward-directivity effect pulse (FD), Fling-step effect pulse (FS) and non-pulse records, are investigated. The results revealed that SSI effects mainly affect the bridge responses through a systematic decrease of all modal frequencies and a substantial change in nature of dominant shapes especially for the higher modes of vibrations. When the bridge is subjected to pulse-type near-fault ground motions, SSI effect causes larger displacements of the towers, a significant decrease in the internal forces of the towers, and a certain degree of reduction in both the displacement and base moment of the girder under the longitudinal excitations. However, the response of the girder under horizontal excitations is obviously amplified by SSI effect. The seismic response of the cable-stayed bridge under the pulse-type ground motions is significantly higher than that under non-pulse ground motions. Fling-step ground motions amplify the response of the towers under the longitudinal excitations and the response of the girder under the longitudinal or horizontal excitations. Forward-directivity ground motions amplify the response of the towers under the horizontal excitations. The research results could be used to provide a reference for the seismic design of long-span cable-stayed bridge system located in near-fault zones.
张凡1,2，李帅1,2，颜晓伟3，王景全1,2. 近断层脉冲型地震动作用下大跨斜拉桥地震响应分析[J]. 振动与冲击, 2017, 36(21): 163-172.
ZHANG Fan1,2, LI Shuai1,2, YAN Xiaowei3, WANG Jingquan1,2. Effects of near-fault pulse-type ground motions on long-span cable-stayed bridge. JOURNAL OF VIBRATION AND SHOCK, 2017, 36(21): 163-172.
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