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Seismic control for multi-span cable-stayed bridge with high-piers using probability fragility method |
HU Si-cong 1 LI Li-feng 1,2 WANG Lian-hua 1,2 |
1. College of Civil Engineering, Hunan University, Changsha 410082, China;
2. Key Laboratory for Wind and Bridge Engineering of Hunan Province, Hunan University, Changsha 410082, China |
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Abstract 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 meters piers was taken as a case-study and the nonlinear finite element model was built in this paper. A series of 80 ground motions were selected from the Pacific Earthquake Engineering Research Center database and the nonlinear history analysis have been conducted. The damage indexes of various components were defined according to the structure characteristic. 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 parameter and arrangement form was contrasted and investigated though fragility curves. At last, the optimal seismic control of the bridge was determined. The results show that the damage probability of bearing, deck and cables increased significantly, and ones of towers become slighter with the increase of the height of piers; Due to the different transmission mechanism of inertial force, the influence of seismic control parameter present discrepancy for different arrangement forms. The device install at the end of deck is superior to install between deck and towers. For the same arrangement form, Velocity-type control device is more effective than the Displacement-type control device.
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Received: 04 May 2016
Published: 15 November 2017
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