Research on transverse seismic pounding effect and shear-keygaps of high-speed railway continuous beam bridges

被引：1
|
作者：
Yang M. [1 ]
Wang C. [1 ,2 ]
Qiao J. [1 ]
机构：
[1] School of Civil Engineering, Central South University, Changsha
[2] Shanghai Municipal Engineering Design Institute(Group) Co. Ltd., Shanghai
来源：
Zhongnan Daxue Xuebao (Ziran Kexue Ban)/Journal of Central South University (Science and Technology) | 2019年 / 50卷 / 09期
基金：
中国国家自然科学基金;
关键词：
Gap of the steel shear key; High-speed railway continuous beam bridge; Pounding effect; Rubber bumper devices; Transverse earthquake;
D O I：
10.11817/j.issn.1672-7207.2019.09.022
中图分类号：
学科分类号：
摘要：
To investigate the transverse pounding effect between steel shear keys and bearing padstones of high-speed railway bridges under earthquake excitations, a finite element model of a high-speed railway bridge considering the transverse pounding effect, which consists of one continuous beam bridge (48+80+48) m and two simply-supported beam bridges(32 m) on each side, was established based on ANSYS. The impacts of the restriction of track system(CRTSII),the eccentricity between bearing padstones and girders, the nonlinear behavior of shear keys and bearing and the elastic-plastic behavior of piers on transverse pounding effects of the bridge were also considered in the numerical model. With the time history analysis method for nonlinear seismic responses of structures, the influence of the track system, the shear keys, the gaps between shear keys and bearing padstones on transverse seismic responses was analyzed.Finally, the shear-key gaps of the continuous beam bridge at outer piers and inner piers were optimized and the pounding reduction effect of the rubber bumpers was investigated. The results show that the restriction effect of the track system alters the dynamic characteristics of the bridge, and also magnifies the inhomogeneity of the distribution of shear forces at the bottom of piers. Under strong earthquake excitations, the transverse restricting effect of the shear keys is significant. The peak seismic responses of the continuous beam bridge reach lower values when the gap between shear keys and bearing padstones is 2-3 cm and it is better to increase the gap of shear keys at inner piers properly. The maximum relative displacement between the pier and the girder and pounding force of the continuous beam bridge will decrease when the rubber bumpers are installed, and the isolation effect is related to the thickness and layout method of them. © 2019, Central South University Press. All right reserved.
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页码：2252 / 2263
页数：11
相关论文
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