结构参数对双链式悬索桥地震响应的影响
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摘要
以某双链式悬索桥为工程背景,建立了空间有限元计算模型。运用几何非线性时程分析方法,分析并探讨了不同垂跨比、阻尼比,塔桥不同连接方式和双链位置对双链式悬索桥地震响应的影响。分析表明,竖向地震动分量使桥塔轴力迅速增大,加劲梁采用钢筋混凝土边梁可有效减小地震响应;塔梁间采用简支连接方案其抗震性能比固定支座连接方案、滑动支座连接方案要好;双链式悬索桥横向抗震性能优于单链式悬索桥。对双链式悬索桥抗震性能的研究,为此类悬索结构的设计选型,乃至减震、隔震及抗震加固提供了参考。
Taking a double cables suspension bridge as engineering background,a three-dimensional finite element model was established.Considering different sag ratios and damping ratios,different connection between stiffening girder and tower,and different location of double cales the seismic response of the double cables suspension bridge was analyzed and discussed by geometric nonlinear time history analysis method.The results show that vertical ground motion component make the axial force of bridge tower increases rapidly,and the stiffening girder using reinforced concrete edge beam can effectively reduce the seismic response;the seismic performance of simply supported connection scheme is better than both of the fixed bearing connection and sliding bearing connection schemes;the horizontal seismic performance of the double cables suspension bridge is better than that of single cables suspension bridge.The study of the seismic response characteristics of the double cable suspension bridge give a reference to structural form selection of such type bridge during designing,as to well as shock absorption,vibration isolation,and anti-seismic retrorit design.
Taking a double cables suspension bridge as engineering background,a three-dimensional finite element model was established.Considering different sag ratios and damping ratios,different connection between stiffening girder and tower,and different location of double cales the seismic response of the double cables suspension bridge was analyzed and discussed by geometric nonlinear time history analysis method.The results show that vertical ground motion component make the axial force of bridge tower increases rapidly,and the stiffening girder using reinforced concrete edge beam can effectively reduce the seismic response;the seismic performance of simply supported connection scheme is better than both of the fixed bearing connection and sliding bearing connection schemes;the horizontal seismic performance of the double cables suspension bridge is better than that of single cables suspension bridge.The study of the seismic response characteristics of the double cable suspension bridge give a reference to structural form selection of such type bridge during designing,as to well as shock absorption,vibration isolation,and anti-seismic retrorit design.
引文
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[9]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 Menggang,HU Jianhua,CHEN Zhengqing.Seismic response analysis of self-anchored suspension bridge with single-tower[J].Journal ofCenter South Univaersity(science and technology),2005,36(1):133-137.
[10]聂利英,叶爱君,胡世德.大跨度悬索桥地震动力分析中高阶振动的影响[J].同济大学学报,2001,29(1):84-88.NIE Liying,YE Aijun,HU Shide.Effects of higher modes of vibration on seismic response of suspension bridges[J].Journal of Tongji Universi-ty,2001,29(1):84-88.
[11]秦权,罗颖,孙浩.悬索桥上部结构的抗震设计.清华大学学报(自然科学版),1998,38(12):52-56.QIN Quan,LUO Ying,SUN Hao.Seismic design of suspension bridge superstructures[J].Journal of Tsinghua University(Sci&Tech),1998,38(12):52-56.
[12]丁南宏,钱永久,林丽霞.双链式悬索桥在单车荷载下的振动特征[J].振动与冲击,2010,29(7):216-220.DING Nanhong,QIAN Yongjiu,LIN Lixia.Vibration character of double cable suspension bridge under single vehicle load[J].Journal of Vibra-tion and Shock,2010,29(7):216-220.
[2]林丽霞,吴亚平,丁南宏.双索悬索桥结构参数对自振特性的影响分析[J].铁道学报,2007,29(4):91-95.LIN Lixia,WU Yaping,DING Nanhong.Influence of structure parameters on natural vibration characteristics of double-cable suspension bridge[J].Journal of the China Railway Society,2007,29(4):91-95.
[3]Huang M H,Thambiratnam D P,Perera N J.Vibration characteristics of shallow suspension bridge with pre-tensioned cables[J].EngineeringStructures,2005,27(13):1220-1233.
[4]胡世德,范立础.江阴长江公路大桥纵向地震反应分析[J].同济大学学报,1994,22(4):433-438.HU Shide,FAN Lichu.The longitudinal earthquake response analysis for the jiangyin yangtze river bridge[J].Journal of Tongji University,1994,22(4):433-438.
[5]李志岭,秦权.用R1tZ法分析江阴悬索桥地震反应的影响[J].工程力学,2003,20(1):32-36.LI Zhiling,QIN Quan.RITZ method for seismic response analysis of jiangyin suspended bridge with non-classical damping[J].Engineering Me-chanics,2003,20(1):32-36.
[6]Arzoumanidis S,Shama Y,Ostadan O.Performance-based seismic analysis and design of suspension bridges[J].Earthquake Engineering andStructural Dynamics,2005,34(1):349-317.
[7]秦权,楼磊.非经典阻尼对悬索桥地震反应的影响[J].土木工程学报,1999,32(3):18-22.QIN Quan,LOU Lei.Influences of non-classic damping on seismic responses of suspension bridges[J].China Civil Engineering Journal,1997,32(3):18-22.
[8]彭大文,黄朝光,王忠.单塔悬索桥的地震响应研究[J].中国公路学报,1997,10(4):55-63.PENG Dawen,HUANG Chaoguang,WANG Zhong.Analysis of earthquake response for single-tower suspension bridge[J].China Journal ofHighway and Transport,1997,10(4):55-63.
[9]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 Menggang,HU Jianhua,CHEN Zhengqing.Seismic response analysis of self-anchored suspension bridge with single-tower[J].Journal ofCenter South Univaersity(science and technology),2005,36(1):133-137.
[10]聂利英,叶爱君,胡世德.大跨度悬索桥地震动力分析中高阶振动的影响[J].同济大学学报,2001,29(1):84-88.NIE Liying,YE Aijun,HU Shide.Effects of higher modes of vibration on seismic response of suspension bridges[J].Journal of Tongji Universi-ty,2001,29(1):84-88.
[11]秦权,罗颖,孙浩.悬索桥上部结构的抗震设计.清华大学学报(自然科学版),1998,38(12):52-56.QIN Quan,LUO Ying,SUN Hao.Seismic design of suspension bridge superstructures[J].Journal of Tsinghua University(Sci&Tech),1998,38(12):52-56.
[12]丁南宏,钱永久,林丽霞.双链式悬索桥在单车荷载下的振动特征[J].振动与冲击,2010,29(7):216-220.DING Nanhong,QIAN Yongjiu,LIN Lixia.Vibration character of double cable suspension bridge under single vehicle load[J].Journal of Vibra-tion and Shock,2010,29(7):216-220.
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