Deformation, heating and performance degradation of lead rubber bearings for highway bridges under near fault ground motions

doi:10.13465/j.cnki.jvs.2020.23.015

CORC > 兰州理工大学 > 兰州理工大学 > 土木工程学院

	Deformation, heating and performance degradation of lead rubber bearings for highway bridges under near fault ground motions
	Shi, Yan; Wang, Haohao; Qin, Hongguo; Han, Jianping; Xiong, Lijun
刊名	Zhendong yu Chongji/Journal of Vibration and Shock
	2020-12-15
卷号	39 期号:23 页码:96-106
关键词	Bearings (structural) Damping Deformation Energy dissipation Heating Hysteresis Nonmetallic bearings Rubber Seismology Shear strain Stiffness Bearing displacements Displacement response Hysteretic energy dissipations Isolation structures Near fault ground motion Nonlinear dynamic time-history analysis Performance degradation Strength and stiffness
ISSN号	10003835
DOI	10.13465/j.cnki.jvs.2020.23.015
英文摘要	Lead-rubber bearings (LRBs) are extensively used seismic isolators in bridges. The cyclic deformation of LRBs under earthquake can cause heating accumulation and temperature rising. As a result, variations of mechanical properties of LRBs including dropping of hysteretic energy dissipation, characteristic strength and stiffness threaten seismic safety of bridges. Here, according to the code of the lead rubber bearing isolator for highway bridge (JT/T 822-2011), 22 types circular LRBs were taken as objects to establish 40 single bearing isolation structure models with different periods. 40 bilateral near-fault ground motion records suitable to transportation field structure aseismic design were input into models to perform nonlinear dynamic time history analyses. Effects of lead core heating on LRBs' displacement, temperature, characteristic strength and hysteretic energy dissipation were studied. In addition, relations among increment of lead core temperature, characteristic strength reduction rate and near-fault ground motion were discussed to establish fitted relation expressions among bearing displacement ductility coefficient, shear strain and Qd/W. Results showed that for the isolated systems with medium-long periods (1.5~3 s) under near fault ground motion, lead core temperature rising and characteristic strength dropping are obvious, the increase in lead core temperature is 50-80, characteristic strength drops 20%-40%; displacement responses of LRBs can be under-estimated by 15% not considering lead core heating. © 2020, Editorial Office of Journal of Vibration and Shock. All right reserved.
语种	中文
出版者	Chinese Vibration Engineering Society
内容类型	期刊论文
源URL	[http://ir.lut.edu.cn/handle/2XXMBERH/150860]
专题	土木工程学院教务处（创新创业学院）
作者单位	School of Civil Engineering, Lanzhou University of Technology, Lanzhou; 730050, China
推荐引用方式 GB/T 7714	Shi, Yan,Wang, Haohao,Qin, Hongguo,et al. Deformation, heating and performance degradation of lead rubber bearings for highway bridges under near fault ground motions[J]. Zhendong yu Chongji/Journal of Vibration and Shock,2020,39(23):96-106.
APA	Shi, Yan,Wang, Haohao,Qin, Hongguo,Han, Jianping,&Xiong, Lijun.(2020).Deformation, heating and performance degradation of lead rubber bearings for highway bridges under near fault ground motions.Zhendong yu Chongji/Journal of Vibration and Shock,39(23),96-106.
MLA	Shi, Yan,et al."Deformation, heating and performance degradation of lead rubber bearings for highway bridges under near fault ground motions".Zhendong yu Chongji/Journal of Vibration and Shock 39.23(2020):96-106.