Seismic control for multi-span cable-stayed bridge with high-piers using seismic fragility method

被引：0
|
作者：
Hu S. [1 ]
Li L. [1 ,2 ]
Wang L. [1 ,2 ]
机构：
[1] College of Civil Engineering, Hunan University, Changsha
[2] Key Laboratory for Wind and Bridge Engineering of Hunan Province, Hunan University, Changsha
来源：
Zhendong yu Chongji/Journal of Vibration and Shock | 2017年 / 36卷 / 22期
关键词：
Bridge engineering; Fluid viscous damper; High piers; Lead rubber bearing; Multi-span cable-stayed bridge; Seismic control; Seismic fragility assessment;
D O I：
10.13465/j.cnki.jvs.2017.22.024
中图分类号：
学科分类号：
摘要：
In order to investigate the effect of seismic control devices on multi-span cable-stayed bridges with high piers, a cable-stayed bridge with 178-meter piers was taken as an example and the nonlinear finite element model was built. A series of 80 ground motions were selected from the Pacific Earthquake Engineering Research Center database and the nonlinear history analysis was conducted. The damage indexes of various components were defined according to the structure characteristics. Based on the fragility method, components and bridge system fragility curves were established, respectively. The seismic control effect of Displacement-type and Velocity-type control devices, represented by the lead rubber bearing (LRB) and the viscous fluid damper (VFD), with different parameters and arrangement forms was compared and investigated through fragility curves. At last, the optimal seismic control of the bridge was determined. The results show that the damage probability of bearings, the deck and cables increase significantly and one of towers becomes slighter with the height of piers. Due to different transmission mechanism of inertial force, the influence of seismic control parameter presents discrepancy for different arrangement forms. The device installed at the end of deck is superior to those installed between the deck and towers. For the same arrangement form, Velocity-type control device is more effective than the Displacement-type control device. © 2017, Editorial Office of Journal of Vibration and Shock. All right reserved.
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页码：149 / 157
页数：8
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