大跨度独塔自锚式悬索桥减隔震措施
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摘要
为了减小大跨度自锚式悬索桥在地震作用下的主梁纵向位移,以某主跨350 m的独塔自锚式悬索桥为研究对象,建立Midas空间动力有限元模型,进行动力特性分析,研究在实桥地震波一致激励作用下,铅芯橡胶支座和黏滞阻尼器2种减震措施的减震效果。研究结果表明:通过在桥墩设置铅芯橡胶支座或在塔梁间纵向设置黏滞阻尼器可以有效减小自锚式悬索桥的纵向位移响应。
In order to reduce the main girder's longitudinal displacement of long-span self-anchored suspension bridge under the earthquake,the midas three-dimensional dynamic finite element model of a single tower self-anchored suspension bridge with main span of the 350 m was established,and the dynamic characteristics were analyzed.Furthermore,the seismic response reduction effects of two measures,i.e.,the lead rubber bearings and the viscous dampers,under the real bridge seismic wave were investigated.The results show that the longitudinal displacement responses of self-anchored suspension bridge can be effectively mitigated by the lead rubber bearings placed on the piers or by the viscous dampers placed between the main tower and the main girder in the longitudinal direction.
In order to reduce the main girder's longitudinal displacement of long-span self-anchored suspension bridge under the earthquake,the midas three-dimensional dynamic finite element model of a single tower self-anchored suspension bridge with main span of the 350 m was established,and the dynamic characteristics were analyzed.Furthermore,the seismic response reduction effects of two measures,i.e.,the lead rubber bearings and the viscous dampers,under the real bridge seismic wave were investigated.The results show that the longitudinal displacement responses of self-anchored suspension bridge can be effectively mitigated by the lead rubber bearings placed on the piers or by the viscous dampers placed between the main tower and the main girder in the longitudinal direction.
引文
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[9]范立础,王志强.桥梁减隔震设计[M].北京:人民交通出版社,2001.FAN Li-chu,WANG Zhi-qiang.Seismic isolation designof bridges[M].Beijing:China Communication Press,2001.
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[11]杨银庆.大跨度自锚式悬索桥非线性地震反应分析与减隔震研究[D].长沙:中南大学,2007.YANG Yin-qing.Long span suspension bridge for non-linear seismic response analysis and isolation[D].Chan-gsha:Central South University,2007.
[12]杨孟刚,陈政清.自锚式悬索桥施工过程模拟分析[J].湖南大学学报:自然科学版,2006,33(2):26-30.YANG Meng-gang,CHEN Zheng-qing.An analysis ofconstruction stages simulation for self-anchored suspen-sion bridges[J].Journal of Hunan University:NaturalSciences,2006,33(2):26-30.
[2]胡建华.现代自锚式悬索桥理论与应用[M].北京:人民交通出版社,2008.HU Jian-hua.Theory and practice of modern self-an-chored suspension bridge[M].Beijing:China Communi-cation Press,2008.
[3]杨孟刚,胡建华,陈政清.独塔自锚式悬索桥地震响应分析[J].中南大学学报:自然科学版,2005,36(1):133-137.YANG Meng-gang,HU Jian-hua,CHEN Zheng-qing.Seismic response analysis of self-anchored suspensionbridge with single-tower[J].Journal of Central South U-niversity:Science and Technology,2005,36(1):133-137.
[4]刘春城,张哲,石磊.自锚式悬索桥的纵向地震反应研究[J].武汉理工大学学报:交通科学与工程版,2002,26(5):207-210.LIUChun-cheng,ZHANG Zhe,SHI Lei.Analysis of longi-tudinal seismic response for self-anchored suspension bridg-es[J].Journal of Wuhan University of Technology:Transpor-tation Science&Engineering,2002,26(5):207-210.
[5]刘燕,赵胜利,李红梅,等.铅芯橡胶支座的隔震效果[J].四川建筑科学研究,2007,33(4):173-176.LIUYan,ZHAOSheng-li,LI Hong-mei,et al.Analysis ofisolating affection about lead rubber isolation bearings[J].Sichuan Building Science,2007,33(4):173-176.
[6]Feng M Q,Kim J M,Shinozuka M,et al.Viscoelasticdampers at expansion joints for seismic protection of bridg-es[J].Journal of Bridge Engineering,2000,5(1):67-74.
[7]Sadek F,Mohrez B,Lew H S.Single and multipletunedliquid column dampers for seismic applications[J].EE-SD,1998,27(5):439-463.
[8]管仲国,李建中,朱宇.弹塑性阻尼支座用于自锚式悬索桥减震设计[J].同济大学学报:自然科学版,2009,37(1):6-12.GUAN Zhong-guo,LI Jian-zhong,ZHU Yu.Elastic-plastic energy dissipating bearing for seismic design of self-anchored suspension bridge with single tower[J].Jour-nal of Tongji University:Natural Science,2009,37(1):6-12.
[9]范立础,王志强.桥梁减隔震设计[M].北京:人民交通出版社,2001.FAN Li-chu,WANG Zhi-qiang.Seismic isolation designof bridges[M].Beijing:China Communication Press,2001.
[10]Ingham TJ,Rodriguez S,Seim C.Use of dampers in theseismic retrofit of the Golden Gate Bridge[C]//Proceed-ings of the 15th Structures Congress.Portland,USA,1997:1219-1223.
[11]杨银庆.大跨度自锚式悬索桥非线性地震反应分析与减隔震研究[D].长沙:中南大学,2007.YANG Yin-qing.Long span suspension bridge for non-linear seismic response analysis and isolation[D].Chan-gsha:Central South University,2007.
[12]杨孟刚,陈政清.自锚式悬索桥施工过程模拟分析[J].湖南大学学报:自然科学版,2006,33(2):26-30.YANG Meng-gang,CHEN Zheng-qing.An analysis ofconstruction stages simulation for self-anchored suspen-sion bridges[J].Journal of Hunan University:NaturalSciences,2006,33(2):26-30.
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