三塔斜拉桥抗震性能非线性时程分析
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摘要
以正在建设的一座大跨径3塔结合梁斜拉桥为研究背景,建立空间动力有限元模型,对E1和E2水平的三向地震作用下结构地震反应进行了非线性时程分析,并研究了行波效应对结构地震反应的影响.结果表明:该桥在两阶段设防的地震反应符合相关抗震规范要求,具有较好的抗震性能;主塔地震反应中,弯矩与应力分布规律有不一致的现象;行波效应对3塔斜拉桥中塔纵向地震反应的影响很小,对边塔的影响较大,且相对一致激励为不利影响,其随视波速的增大而减小;行波效应对主塔横向地震反应影响很小.
On the background of a long-span composite girder cable-stayed bridge with three pylons under construction for research,this paper establishes a three-dimensional dynamic finite element model,makes nonlinear time-history analysis of the structure under three dimensional E1 earthquakes and E2 earthquakes,and studies the effect of traveling wave on seismic responses of the whole bridge.The results show that the cable-stayed bridge has relatively good seismic performance because seismic responses of the structure comply with requirements of the relative specifications of earthquake resistance under two stage earthquakes,the distributions of bending moment of pylons are not according with those of the stresses in pylons,though traveling waves have small effects on seismic responses of the middle pylon their effects on the responses in longitudinal direction of the side pylons are more and are unfavorable with decrease of velocity,and those on responses in transverse direction of the structure appear small.
On the background of a long-span composite girder cable-stayed bridge with three pylons under construction for research,this paper establishes a three-dimensional dynamic finite element model,makes nonlinear time-history analysis of the structure under three dimensional E1 earthquakes and E2 earthquakes,and studies the effect of traveling wave on seismic responses of the whole bridge.The results show that the cable-stayed bridge has relatively good seismic performance because seismic responses of the structure comply with requirements of the relative specifications of earthquake resistance under two stage earthquakes,the distributions of bending moment of pylons are not according with those of the stresses in pylons,though traveling waves have small effects on seismic responses of the middle pylon their effects on the responses in longitudinal direction of the side pylons are more and are unfavorable with decrease of velocity,and those on responses in transverse direction of the structure appear small.
引文
[1]韩振峰,叶爱君,范立础.千米级斜拉桥的动力几何非线性分析[J].土木工程学报,2010,43(6):67-73.
[2]徐凯燕,魏德敏.武汉军山长江大桥非线性地震反应时程分析[J].湖南大学学报,2010,37(5):19-23.
[3]余报楚,邱文亮,余庆军.广东金马大桥三维地震时程反应研究[J].武汉理工大学学报:交通科学与工程版,2010,34(6):1 167-1 171.
[4]Soyluka K,Dumanoglu A A.Geometrical spatialvariability effects of ground motions on cable-stayedbridges[J].Soil Dynamics and Earthquake Engi-neering,2004,24:241-250.
[5]项海帆.斜拉桥在行波作用下的地震反应分析[J].同济大学学报,1983(2):1-9.
[6]陈幼平,周宏业.斜拉桥地震反应的行波效应[J].土木工程学报,1996,29(6):61-68.
[7]白玲.大跨度钢管混凝土拱桥地震响应分析[J].中国铁道科学,2008,29(6):41-45.
[8]Freire A M S,Negrao J H O,Lopes A V.Geomet-rical nonlinearities on the static analysis of highlyflexible steel cable-stayed bridges[J].Computers andStructures,2006,84:2 128-2 140.
[9]钱稼茹,纪晓东,范重,刘先明.国家体育场大跨度钢结构罕遇地震性能分析[J].建筑结构学报,2007,28(2):16-25.
[10]刘健新,张伟,张茜.洛河特大桥抗震性能计算[J].交通运输工程学报,2006,6(1):57-62.
[2]徐凯燕,魏德敏.武汉军山长江大桥非线性地震反应时程分析[J].湖南大学学报,2010,37(5):19-23.
[3]余报楚,邱文亮,余庆军.广东金马大桥三维地震时程反应研究[J].武汉理工大学学报:交通科学与工程版,2010,34(6):1 167-1 171.
[4]Soyluka K,Dumanoglu A A.Geometrical spatialvariability effects of ground motions on cable-stayedbridges[J].Soil Dynamics and Earthquake Engi-neering,2004,24:241-250.
[5]项海帆.斜拉桥在行波作用下的地震反应分析[J].同济大学学报,1983(2):1-9.
[6]陈幼平,周宏业.斜拉桥地震反应的行波效应[J].土木工程学报,1996,29(6):61-68.
[7]白玲.大跨度钢管混凝土拱桥地震响应分析[J].中国铁道科学,2008,29(6):41-45.
[8]Freire A M S,Negrao J H O,Lopes A V.Geomet-rical nonlinearities on the static analysis of highlyflexible steel cable-stayed bridges[J].Computers andStructures,2006,84:2 128-2 140.
[9]钱稼茹,纪晓东,范重,刘先明.国家体育场大跨度钢结构罕遇地震性能分析[J].建筑结构学报,2007,28(2):16-25.
[10]刘健新,张伟,张茜.洛河特大桥抗震性能计算[J].交通运输工程学报,2006,6(1):57-62.
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