Effects of near-fault pulse-type ground motions on the seismic responses of a long-span cable-stayed bridge

被引：0

作者：

Zhang F. ^{[1
,2
]}

Li S. ^{[1
,2
]}

Yan X. ^{[3
]}

Wang J. ^{[1
,2
]}

机构：

[1] Key Laboratory of Concrete and Prestressed Concrete Structure of China Ministry of Education, Nanjing

[2] National Prestress Engineering Research Center, Nanjing

[3] Shanghai Municipal Planning Design Research Institute, Shanghai

来源：

Zhendong yu Chongji/Journal of Vibration and Shock | 2017年 / 36卷 / 21期

关键词：

Fling-step effect; Forward-directivity effect; Long-span cable-stayed bridge; Near-fault ground motion; Soil-structure interaction; Systematic lumped-parameter model;

D O I：

10.13465/j.cnki.jvs.2017.21.025

中图分类号：

学科分类号：

摘要：

The objective of the study is to determine the seismic responses of the Sutong cable-stayed bridge, taking into account the near-fault pulse-type ground motion effect and soil-structure interaction effect(SSI). Systematic lumped-parameter models were adopted to describe the dynamic behavior of the foundation supported on soil. The dynamic finite element model of the bridge considering the SSI effect was 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, were investigated. The results reveal that SSI effects mainly affect the bridge responses through a systematic decrease of all modal frequencies and a substantial change in the nature of dominant shapes especially for the higher modes of vibrations. When the bridge is subjected to pulse-type near-fault ground motions, the 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 longitudinal excitations. However, the response of the girder under horizontal excitations is obviously amplified by the SSI effect. The seismic responses of the cable-stayed bridge under the pulse-type ground motions are significantly higher than that under non-pulse ground motions. Fling-step ground motions amplify the responses of the towers under longitudinal excitations and the responses of the girder under longitudinal or horizontal excitations. Forward-directivity ground motions amplify the responses of the towers under horizontal excitations. The research results could provide a reference for the seismic design of long-span cable-stayed bridge systems located in near-fault zones. © 2017, Editorial Office of Journal of Vibration and Shock. All right reserved.

引用

页码：163 / 172and184

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