多维地震输入下曲线匝道桥梁伸缩缝碰撞响应
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摘要
针对曲线匝道桥梁伸缩缝地震碰撞破坏现象,依托某市多层互通式立交体系中一座独立、单支、多联、曲线、箱梁匝道桥,用Kelvin接触单元模拟了伸缩缝处地震和碰撞效应,建立了全桥空间动力分析模型。利用非线性时程分析法,分别输入单维(X方向、Y方向)和多维共8种地震动工况,分析了曲线匝道桥梁伸缩缝的地震碰撞响应差异。结果表明:曲线匝道桥梁由于曲率的影响,不同方向地震动响应存在耦合效应,其伸缩缝碰撞响应的最不利值应考虑多维地震输入工况,并用碰撞力和碰撞位移双指标控制伸缩缝的地震碰撞响应。
In view of the pounding damage of expansion joint in a curved bridge under earthquake,the Kelvin contact element was used to simulate the pounding between expansion joints.An independent single multi-unit long curved ramp bridge in a multilevel junction system was selected as a project example,and its space dynamic model was built.Using nonlinear time history analysis method,the different pounding responses of the bridge were analyzed under eight different types of seismic conditions those were in one-dimensional or multidimensional seismic input direction.The results show that the seismic response of a curved bridge in different directions is coupled.So the expansion joint seismic pounding response of a curved bridge should be analyzed including multidimensional seismic condition and evaluated with pounding force and pounding displacement simultaneously.
In view of the pounding damage of expansion joint in a curved bridge under earthquake,the Kelvin contact element was used to simulate the pounding between expansion joints.An independent single multi-unit long curved ramp bridge in a multilevel junction system was selected as a project example,and its space dynamic model was built.Using nonlinear time history analysis method,the different pounding responses of the bridge were analyzed under eight different types of seismic conditions those were in one-dimensional or multidimensional seismic input direction.The results show that the seismic response of a curved bridge in different directions is coupled.So the expansion joint seismic pounding response of a curved bridge should be analyzed including multidimensional seismic condition and evaluated with pounding force and pounding displacement simultaneously.
引文
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[5]Praveen K Malhotra.Dynamics of seismic pounding at expansion joints of concrete bridges[J].Journal of Engineering Mechanics,ASCE,1998,124(7):794-802.
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[2]Kawashma K,Penzien J.Theoretical and experimental dynamic behaviour of a curved model bridge structure[J].Earthquake Engineering&Structural Dynam-ics,1979,7(2)129-145.
[3]R Jankowski,K Wilde,Y Fujino.Reduction of pounding effects in elevated bridges during earthquakes[J].Earthquake Engineering&Structural Dynamics,2000,29(2):195-212.
[4]王东升,冯启民,王国新.基于直杆共轴碰撞理论的桥梁地震反应邻梁碰撞分析模型[J].工程力学,2004,21(2):157-165.WANG Dongsheng,FENG Qimin,WANG Guoxin.Analysis model of pounding between adjacent bridge girders during earthquakes based on collinear impact be-tween rods[J].Engineering Mechanics,2004,21(2):157-165.
[5]Praveen K Malhotra.Dynamics of seismic pounding at expansion joints of concrete bridges[J].Journal of Engineering Mechanics,ASCE,1998,124(7):794-802.
[6]公路桥梁抗震设计细则(JTG/T B2-01——2008).北京:人民交通出版社,2008.Guidelines for Seismic Design of Highway Bridges(JTG/T B2-01———2008)Beijing:China Communications Press,2008.
[7]朱东升,劳远昌,沈大元,李乔.桥梁抗震分析中输入地震波的确定[J].桥梁建设,2000,23(3):1-4.ZHU Dongsheng,LAO Yuanchang,SHENDa yuan,LI Qiao.Determination of seismic waves introduced into bridge seismic response analysis[J].Bridge Construction,2000,23(3):1-4.
[8]柳春光,焦双健.城市立交桥结构三维地震反应[J].地震工程与工程震动,2001,21(2):41-47.LIU Chun guang,JIAO Shuang jian.Three-dimensional seismic response analysis of urban overpass structures[J].Earthquake Engineering andEngineering Vibration,2001,21(2):41-47.
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