地震作用下大跨斜拉桥主桥与多联引桥伸缩缝处连锁碰撞效应研究
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摘要
针对地震作用下大跨斜拉桥主桥与多联引桥间易发生连锁碰撞现象,以一座典型大跨斜拉桥为研究背景,采用SAP2000 Nonlinear有限元程序,建立考虑主桥与多联引桥伸缩缝处碰撞效应的桥梁结构三维非线性计算模型,采用非线性时程分析法,研究大跨斜拉桥主桥与多联引桥伸缩缝处连锁碰撞效应对桥梁抗震性能的影响,并分析初始间隙、引桥周期比对连锁碰撞效应的影响规律。研究结果表明:若仅在引桥-引桥相邻梁体间发生碰撞,碰撞效应对短周期联引桥影响不大,但对长周期联引桥有一定影响,即会增大长周期联引桥梁端位移、梁墩相对位移以及固定墩墩底地震响应;而若主桥与多联引桥间发生连锁碰撞,不仅会显著增大短周期联引桥梁端位移、梁墩相对位移以及桥墩地震响应,而且会进一步增大长周期联引桥梁端位移、梁墩相对位移以及桥墩地震响应,更易引起各联引桥桥墩破坏或梁体落梁;随着初始间隙的增大,连锁碰撞效应对引桥结构的影响减弱;随着短周期联引桥基本周期的减小,连锁碰撞效应对短周期联的影响也有所降低。
Because the pounding usually occurs at expansion joints between main span and multiple approach spans,a typical long-span cable-stayed bridge is analyzed. The three dimensional nonlinear dynamics model considering the effects of pounding at expansion joints between main span and multiple approach spans is established by SAP2000 Nonlinear software. Using the nonlinear time history analysis method,the effects of pounding at expansion joints on seismic performance of the bridge under earthquakes are studied and the influence laws of initial clearances and the natural period ratios between approach spans are analyzed. The results indicate that if the pounding only emerges between approach spans,it has little influence on the short-period unit approach span. However,the pounding has more influence on the long-period unit approach span because the pounding effects can amplify the deck displacement,the relative displacement between the deck and transitional pier,and the seismic response of its fixed pier. But if the pounding between main span and multiple approach span takes place,both the seismic responses of the short-period unit approach spans and long-period unit approach spans will be amplified. Furthermore,the piers of approach spans may be seriously damaged the decks may collpase. The effects of the pounding decrease with the increase of initial clearances.The effects on the short-period unit approach span also weaken gradually when the natural period of the short-period unit approach span decreases.
Because the pounding usually occurs at expansion joints between main span and multiple approach spans,a typical long-span cable-stayed bridge is analyzed. The three dimensional nonlinear dynamics model considering the effects of pounding at expansion joints between main span and multiple approach spans is established by SAP2000 Nonlinear software. Using the nonlinear time history analysis method,the effects of pounding at expansion joints on seismic performance of the bridge under earthquakes are studied and the influence laws of initial clearances and the natural period ratios between approach spans are analyzed. The results indicate that if the pounding only emerges between approach spans,it has little influence on the short-period unit approach span. However,the pounding has more influence on the long-period unit approach span because the pounding effects can amplify the deck displacement,the relative displacement between the deck and transitional pier,and the seismic response of its fixed pier. But if the pounding between main span and multiple approach span takes place,both the seismic responses of the short-period unit approach spans and long-period unit approach spans will be amplified. Furthermore,the piers of approach spans may be seriously damaged the decks may collpase. The effects of the pounding decrease with the increase of initial clearances.The effects on the short-period unit approach span also weaken gradually when the natural period of the short-period unit approach span decreases.
引文
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[6]邓育林,雷凡,何雄君.纵向地震作用下大跨三塔悬索桥伸缩缝处双边碰撞效应研究[J].振动与冲击,2013,32(12):126-130(Deng Yulin,Lei Fan,He Xiongjun.Effect of double-side pounding at expansion joints on seismic response of a long-span triple-pylon suspension bridge[J].Journal of Vibration and Shock,2013,32(12):126-130(in Chinese))
[7]邓育林,彭天波,李建中.强震作用下大跨斜拉桥伸缩缝处碰撞效应的影响研究[J].振动与冲击,2011,30(6):26-30(Deng Yulin,Peng Tianbo,Li Jianzhong.Effect of pounding at expansion joints on seismic response of long-span cable-stayed bridge under strong earthquakes[J].Journal of Vibration and Shock,2011,30(6):26-30(in Chinese))
[8]邓育林,彭天波,李建中.大跨多塔悬索桥纵向地震碰撞反应参数研究[J].振动与冲击,2011,30(4):152-157(Deng Yulin,Peng Tianbo,Li Jianzhong.Parametric study of longitudinal seismic pounding response for a longspan multi-tower suspension bridges[J].Journal of Vibration and Shock,2011,30(4):152-157(in Chinese))
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[11]Malhotra P K.Dynamics of seismic pounding at expansion joints of concrete bridges[J].Journal of Engineering Mechanics,1998,124(7):794-802
[2]王军文,李建中,范立础.非规则梁桥伸缩缝处的碰撞对地震反应的影响[J].土木工程学报,2006,39(1):54-59(Wang Junwen,Li Jianzhong,Fan Lichu.Effect of pounding at expansion joints on seismic response of irregular girder bridges[J].China Civil Engineering Journal,2006,39(1):54-59(in Chinese))
[3]王斌斌,叶爱君.地震作用下大跨度斜拉桥和引桥间碰撞分析[J].振动与冲击,2010,29(3):95-99(Wang Binbin,Ye Aijun.Pounding effects between long-span cable-stayed bridge and its approach bridges under earthquake[J].Journal of Vibration and Shock,2010,29(3):95-99(in Chinese))
[4]张文学,王景景,鲍艳.斜拉桥与引桥地震碰撞影响因素研究[J].振动与冲击,2012,31(23):115-119(Zhang Wenxue,Wang Jingjing,Bao Yan.Earthquake impact influence factors for a cable-stayed bridge and its approach bridge[J].Journal of Vibration and Shock,2012,31(23):115-119(in Chinese))
[5]雷凡,邓育林,杨吉新.大跨三塔悬索桥伸缩缝处纵向碰撞对结构地震反应的影响[J].公路交通科技,2012,29(4):34-40(Lei Fan,Deng Yulin,Yang Jixin.Effect of pounding at expansion joints of long-span triple-pylonsuspension bridge on seismic response of the structure[J].Journal of Highway and Transportation Research and Development,2012,29(4):34-40(in Chinese))
[6]邓育林,雷凡,何雄君.纵向地震作用下大跨三塔悬索桥伸缩缝处双边碰撞效应研究[J].振动与冲击,2013,32(12):126-130(Deng Yulin,Lei Fan,He Xiongjun.Effect of double-side pounding at expansion joints on seismic response of a long-span triple-pylon suspension bridge[J].Journal of Vibration and Shock,2013,32(12):126-130(in Chinese))
[7]邓育林,彭天波,李建中.强震作用下大跨斜拉桥伸缩缝处碰撞效应的影响研究[J].振动与冲击,2011,30(6):26-30(Deng Yulin,Peng Tianbo,Li Jianzhong.Effect of pounding at expansion joints on seismic response of long-span cable-stayed bridge under strong earthquakes[J].Journal of Vibration and Shock,2011,30(6):26-30(in Chinese))
[8]邓育林,彭天波,李建中.大跨多塔悬索桥纵向地震碰撞反应参数研究[J].振动与冲击,2011,30(4):152-157(Deng Yulin,Peng Tianbo,Li Jianzhong.Parametric study of longitudinal seismic pounding response for a longspan multi-tower suspension bridges[J].Journal of Vibration and Shock,2011,30(4):152-157(in Chinese))
[9]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—2008Guidelines for seismic design of highway bridges[S].Beijing:China Communications Press,2008(in Chinese))
[10]李建中,范立础.非规则梁桥纵向地震反应及碰撞效应[J].土木工程学报,2005,38(1):84-90(Li Jianzhong,Fan Lichu.Longitudinal seismic response and pounding effects of girder bridges with unconventional configurations[J].China Civil Engineering Journal,2005,38(1):84-90(in Chinese))
[11]Malhotra P K.Dynamics of seismic pounding at expansion joints of concrete bridges[J].Journal of Engineering Mechanics,1998,124(7):794-802
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