基于IDA的混凝土斜拉桥桥塔非线性抗震需求分析
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摘要
由于缺乏对斜拉桥在地震作用下的损伤和破坏过程等基础研究,我国目前的桥梁抗震设计规范要求在偶遇地震作用下,斜拉桥的桥塔也需基本保持弹性。而近年来的研究表明桥塔在强震作用下有进入塑性的可能,且国外已建成的大跨度桥梁明确允许桥塔可以出现塑性。本文利用Open Sees有限元程序,对一典型中等跨度斜拉桥试验模型建立弹塑性有限元动力分析模型进行IDA分析,得出在顺、横桥向地震作用下桥塔的潜在塑性区域、塔顶位移及桥塔关键截面曲率IDA曲线,并利用以上结论指导混凝土斜拉桥模型的振动台试验加载方案设计,为发展斜拉桥非线性抗震理论提供必要的研究基础。
Due to lack of fundamental research on the study of damage process of cable stayed bridges under earthquake excitation,the bridge tower,as the main-load carrying capacity component of the bridge,is explicitly required to remain almost elastic even under the excitation of occasionally happened earthquake according to our current bridge seismic design codes. Recent studies show that the bridge tower may produce plastic failure under strong earthquake. Incremental dynamic analysis method is used in Open Sees to analyze the nonlinear seismic demand of the experimental model from a typical cable-stayed bridge. The potential plastic regions along the tower column,the IDA curves of the tower in regard to displacement and curvature demands under longitudinal and transverse earthquake inputs are obtained. The results are used to guide the shaking table test plan of the concrete cable-stayed model,which provides necessary research basis for the nonlinear seismic theory development of the cable-stayed bridge.
Due to lack of fundamental research on the study of damage process of cable stayed bridges under earthquake excitation,the bridge tower,as the main-load carrying capacity component of the bridge,is explicitly required to remain almost elastic even under the excitation of occasionally happened earthquake according to our current bridge seismic design codes. Recent studies show that the bridge tower may produce plastic failure under strong earthquake. Incremental dynamic analysis method is used in Open Sees to analyze the nonlinear seismic demand of the experimental model from a typical cable-stayed bridge. The potential plastic regions along the tower column,the IDA curves of the tower in regard to displacement and curvature demands under longitudinal and transverse earthquake inputs are obtained. The results are used to guide the shaking table test plan of the concrete cable-stayed model,which provides necessary research basis for the nonlinear seismic theory development of the cable-stayed bridge.
引文
[1]JTG/T B02—01—2008公路桥梁抗震设计细则[S].北京:人民交通出版社,2008.JTG/T B02—01—2008 Guidelines for Seismic Design of Highway Bridges[S].Beijing:China Communications press,2008.(in Chinese)
[2]CJJ 166-2011城市桥梁抗震设计规范[S].北京:中国建筑工业出版社,2011.CJJ 166-2011 Code for Seismic Design of Urban Bridges[S].Beijing:China Building Industry Press,2001.(in Chinese)
[3]徐艳,段昕智,李建中.强震作用下斜拉桥纵桥向非线性地震反应分析[J].华南理工大学学报(自然科学版)2012,40(6).XU Yan,DUAN Xinzhi,LI Jianzhong.Analysis of nonlinear seismic response of cable-stayed bridge subjected to longitudinal strong ground motions[J].Jounal of Journal of South China University of Technology(Natural Science Edition),2012,40(6):132-138.(in Chinese)
[4]Okamoto Y,Nakamura S.Static and seismic studies on steel/concrete hybrid towers for multi-span cable-stayed bridges[J].Journal of Constructional Steel Research,2011,67(2):203-210.
[5]Kawatoh C,Unjoh S.Analyticalstudy on seismic performance evaluation of long-span suspension bridge steel tower[C].Proceedings of the 18th US-Japan Bridge Workshop.2002:416-28.
[6]Arzoumanidis S,Shama A A,Marlow S J,et al.The new Tacoma Narrows suspension bridge:critical issues in seismic analysis and design[C].Proceedings of the 2005 Structures Congress and the 2005 Forensic Engineering Symposium.New York:ASCE,2005.21-31.
[7]Nader M,Lopez-Jara J,Mibelli C.Seismic design strategy of the new san francisco-oakland bay bridge self-anchored suspension span[C].Third National Seismic Conference and Workshop on Bridges and Highways:Advances in Engineering and Technology for the Seismic Safety of Bridges in the New Millennium.2002.
[8]Combault J,Teyssandier J P.The Rion-Antirion Bridge:concept,design and construction[C].Proceedings of the 2005 Structures Congress and the 2005 Forensic Engineering Symposium,New York:ASCE,2005.149~158.
[9]Mc Kenna F,Fenves G L.The Open Sees command language manual[J].University of California,Berkeley(opensees.ce.berkeley.edu),2001.
[2]CJJ 166-2011城市桥梁抗震设计规范[S].北京:中国建筑工业出版社,2011.CJJ 166-2011 Code for Seismic Design of Urban Bridges[S].Beijing:China Building Industry Press,2001.(in Chinese)
[3]徐艳,段昕智,李建中.强震作用下斜拉桥纵桥向非线性地震反应分析[J].华南理工大学学报(自然科学版)2012,40(6).XU Yan,DUAN Xinzhi,LI Jianzhong.Analysis of nonlinear seismic response of cable-stayed bridge subjected to longitudinal strong ground motions[J].Jounal of Journal of South China University of Technology(Natural Science Edition),2012,40(6):132-138.(in Chinese)
[4]Okamoto Y,Nakamura S.Static and seismic studies on steel/concrete hybrid towers for multi-span cable-stayed bridges[J].Journal of Constructional Steel Research,2011,67(2):203-210.
[5]Kawatoh C,Unjoh S.Analyticalstudy on seismic performance evaluation of long-span suspension bridge steel tower[C].Proceedings of the 18th US-Japan Bridge Workshop.2002:416-28.
[6]Arzoumanidis S,Shama A A,Marlow S J,et al.The new Tacoma Narrows suspension bridge:critical issues in seismic analysis and design[C].Proceedings of the 2005 Structures Congress and the 2005 Forensic Engineering Symposium.New York:ASCE,2005.21-31.
[7]Nader M,Lopez-Jara J,Mibelli C.Seismic design strategy of the new san francisco-oakland bay bridge self-anchored suspension span[C].Third National Seismic Conference and Workshop on Bridges and Highways:Advances in Engineering and Technology for the Seismic Safety of Bridges in the New Millennium.2002.
[8]Combault J,Teyssandier J P.The Rion-Antirion Bridge:concept,design and construction[C].Proceedings of the 2005 Structures Congress and the 2005 Forensic Engineering Symposium,New York:ASCE,2005.149~158.
[9]Mc Kenna F,Fenves G L.The Open Sees command language manual[J].University of California,Berkeley(opensees.ce.berkeley.edu),2001.
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