基于阻尼参数的高速铁路连续梁桥地震损伤概率影响分析
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摘要
为研究阻尼参数对高速铁路连续梁桥地震易损性的影响,以一座(32+48+32) m高速铁路连续梁桥为研究背景,借助大型开源程序Open Sees建立了数值模型,并应用基于可靠度理论的概率解析易损性函数表达式获得地震易损性曲线(面),探讨阻尼器参数对桥梁地震易损性的影响。研究结果表明:(1)设置阻尼器使桥梁受力更为合理,可进一步提高桥梁抗震性能;(2)阻尼系数的提高及阻尼指数的降低均使得桥梁固定墩曲率及活动支座位移减小,进而降低固定墩和活动支座在地震作用下的损伤概率。
In this paper,the effects of damper parameters on the seismic vulnerability of high-speed railway bridge are examined with a finite element software OpenSees with reference to a continuous girder bridge of( 32 + 48 + 32) m span. The curve of seismic vulnerability is obtained from the function of probability analytical vulnerability based on reliability theory,and the effects of damper parameters on the seismic vulnerability of High-speed Railway bridge are discussed. The numerical results show that:( 1)setting damper makes the stress distributions of the bridge more reasonable,which further improves the seismic performance of bridge;( 2) the increase of damper coefficient and the decrease of damper index reduce the curvature of the fixed pier and the displacement of the movable bearing,which further reduce the damage probability of the fixed pier and the movable bearing under earthquake action.
In this paper,the effects of damper parameters on the seismic vulnerability of high-speed railway bridge are examined with a finite element software OpenSees with reference to a continuous girder bridge of( 32 + 48 + 32) m span. The curve of seismic vulnerability is obtained from the function of probability analytical vulnerability based on reliability theory,and the effects of damper parameters on the seismic vulnerability of High-speed Railway bridge are discussed. The numerical results show that:( 1)setting damper makes the stress distributions of the bridge more reasonable,which further improves the seismic performance of bridge;( 2) the increase of damper coefficient and the decrease of damper index reduce the curvature of the fixed pier and the displacement of the movable bearing,which further reduce the damage probability of the fixed pier and the movable bearing under earthquake action.
引文
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[3] Singhal A,Kiremidjian A S. Method for probabilistic evaluation of seismic structural damage[J]. Journal of Structural Engineering,1996,122(12):1459-1467.
[4] Yamazaki F,Hamada T,Motoyama H,et al. Earthquake damage assessment of expressway bridges in Japan[C]∥Optimizing Post-Earthquake Lifeline System Reability,ASCE Proc.,5th U. S. Conf. on lifeline Earthquake Engineering,Seattle,1999:361-370.
[5] Dutta A,Mander J B. Seismic fragility analysis of highway bridges[C]∥Proceedings of the Center-to-Center Project Workshop on Earthquake Engineering in Transportation System,Tokyo:1999.
[6] Shinozuka M,Feng M Q,Lee J,et al. Statistical analysis of fragility curves[J]. Journal of Engineering Mechanics, 2000,126(12):1224-31.
[7] Gardoni P,Kiureghian A D,Mosalam K M. Probabilistic capacity models and fragility estimates for RC columns based on experimental observations[J]. Journal of Engineering Mechanics,2002,128(10):1024-1038.
[8] Kim S H,Feng M Q. Fragility analysis of bridges under ground motion with spatial variation. International Journal of Non-Linear Mechanics,2003,38:705-721.
[9] Zhang Jian,Huo Yili. Fragility Function of Base Isolated Highway Bridges[C]∥18thAnalysis and Computation Specialty Conference,2008.
[10]孙振凯,邹其嘉.公路桥梁地震易损性和震后恢复过程[J].华南地震,1999,19(2):62-70.
[11]徐龙军,章倩.铁路桥梁地震震害预测[J].山东建筑工程学院学报,2003,18(1):27-31.
[12]冯清海.特大桥梁地震易损性与风险概率分析[D].上海:同济大学,2008.
[13]李立峰,吴文朋,黄佳梅,等.板式橡胶支座地震易损性分析[J].湖南大学学报,2011,38(11):1-6.
[14]陈力波,郑凯峰.汶川地震桥梁易损性分析[J].西南交通大学学报,2012:47(4):558-566.
[15]董俊.铁路高墩大跨刚构-连续组合体系桥梁近场地震易损性分析研究[D].成都:西南交通大学,2016.
[16]单德山,张二华,张少雄,等.非规则大跨刚构-连续组合桥地震易损性分析[J].防灾减灾工程学报,2017,37(2):208-214.
[17]黄志堂.叠合柱高墩大跨度连续刚构桥概率地震易损性及风险分析[D].成都:西南交通大学,2015.
[18]李鑫.结构参数对高速铁路连续梁桥地震易损性的影响研究[D].成都:西南交通大学,2016.
[19]王炎.铁路减隔震桥梁地震反应分析及易损性研究[D].杭州:浙江大学,2013.
[20]陈学伟,林哲.结构弹塑性分析程序OpenSEES原理与实例[M].北京:中国建筑工业出版社,2014.
[21]过镇海.混凝土的强度和变形——试验基础和本构关系[M].北京:清华大学出版社,1997.