双链式悬索桥地震反应特征研究
|
摘要
双链式悬索桥采用钢加劲梁和钢筋混凝上索塔,使得阻尼在全桥中呈非经典阻尼耗能特性,导致主坐标系中的运动方程耦联。基于复阻尼理论求解等效粘滞阻尼比,以近似描述非经典阻尼体系的阻尼耗能特性。考虑几何非线性及非经典阻尼因素,对一座双链式悬索桥进行了地震反应谱和时程反应分析。引入主缆形状系数,将单链式悬索桥作为双链式悬索桥的特例,就同跨度同矢高的双链式悬索桥和单链式(普通式)悬索桥地震反应进行对比分析,揭示双链式悬索桥地震反应特征。双链式悬索桥地震反应特征的研究对该类桥设计选型、动力性能评估及抗震加固设计都有重要的工程意义。
Damping in double cables suspension bridge composed of steel reinforcement beams and reinforced concrete tower is non-classical,which leads to coupled equations of motion in main coordinate system.Based on the complex damping theory,the equivalent viscous damping ratio was derived,which can be used to describe energy dissipation characteristics of non-classical damping system approximately.The seismic response of double chains suspension bridge was analyzed through a pratical example,considering the geometric nonlinearity and non-classical damping,and numerical calculation was presented for seismic response of the bridge subjected to independent effect or combination effect of three orthogonal components of seismic wave respectively.Single cable suspension bridge can be taken as a special case of double cable suspension bridge,after the main cable shape coefficient was introduced.The dynamic responses of double cable suspension bridge and single cable suspension bridge were compared to reveal the ristics of seismic response of double cable suspension bridge.The study has a positive significance on structural form selection,dynamic performance evaluation and reinforcement design of such type of bridges.
Damping in double cables suspension bridge composed of steel reinforcement beams and reinforced concrete tower is non-classical,which leads to coupled equations of motion in main coordinate system.Based on the complex damping theory,the equivalent viscous damping ratio was derived,which can be used to describe energy dissipation characteristics of non-classical damping system approximately.The seismic response of double chains suspension bridge was analyzed through a pratical example,considering the geometric nonlinearity and non-classical damping,and numerical calculation was presented for seismic response of the bridge subjected to independent effect or combination effect of three orthogonal components of seismic wave respectively.Single cable suspension bridge can be taken as a special case of double cable suspension bridge,after the main cable shape coefficient was introduced.The dynamic responses of double cable suspension bridge and single cable suspension bridge were compared to reveal the ristics of seismic response of double cable suspension bridge.The study has a positive significance on structural form selection,dynamic performance evaluation and reinforcement design of such type of bridges.
引文
[1]严国敏.现代悬索桥[M].北京:人民交通出版社,2002.
[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.
[3]Huang M H,Thambiratnam D P,Perera N J.Vibrationcharacteristics of shallow suspension bridge with pre-tensionedcables[J].Engineering Structures,2005,27(13):1220-1233.
[4]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.
[5]Arzoumanidis S,Shama Y,Ostadan A.Performance-basedseismic analysis and design of suspension bridges[J].Earthquake Engng Struct Dyn,2005,34(1):349-317.
[6]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.
[7]王建有,陈健云.基于复模态的非比例阻尼结构参数识别研究[J].哈尔滨工业大学学报,2005,37(12):1647-1649.
[8]周锡元,董娣,苏幼坡.非正交阻尼线性振动系统的复振型地震反应叠加分析方法[J].土木工程学报,2003,36(5):31-36.
[9]俞瑞芳,周锡元.非比例阻尼弹性结构地震反应强迫解耦方法的背景和数值检验[J].工业建筑,2005,35(2):52-56.
[10]桂国庆,何玉敖.非比例阻尼结构体系近似解耦分析中的误差分析[J].工程力学,1994(4):40-50.
[11]龚炳年,郝锐坤,赵宁.钢-混凝土混合结构模型动力特性的试验研究[J].建筑结构学报,1995,16(3):37-43.
[12]邓育林,贾贤盛.大跨度悬索桥地震反应中高阶振型的影响分析[J].工程抗震与加固改造,2008,30(2):24-24,81.
[13]秦权,罗颖,孙浩.悬索桥上部结构的抗震设计[J].清华大学学报(自然科学版),1998,38(12):52-56.
[14]丁南宏,钱永久,林丽霞,等.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.
[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.
[3]Huang M H,Thambiratnam D P,Perera N J.Vibrationcharacteristics of shallow suspension bridge with pre-tensionedcables[J].Engineering Structures,2005,27(13):1220-1233.
[4]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.
[5]Arzoumanidis S,Shama Y,Ostadan A.Performance-basedseismic analysis and design of suspension bridges[J].Earthquake Engng Struct Dyn,2005,34(1):349-317.
[6]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.
[7]王建有,陈健云.基于复模态的非比例阻尼结构参数识别研究[J].哈尔滨工业大学学报,2005,37(12):1647-1649.
[8]周锡元,董娣,苏幼坡.非正交阻尼线性振动系统的复振型地震反应叠加分析方法[J].土木工程学报,2003,36(5):31-36.
[9]俞瑞芳,周锡元.非比例阻尼弹性结构地震反应强迫解耦方法的背景和数值检验[J].工业建筑,2005,35(2):52-56.
[10]桂国庆,何玉敖.非比例阻尼结构体系近似解耦分析中的误差分析[J].工程力学,1994(4):40-50.
[11]龚炳年,郝锐坤,赵宁.钢-混凝土混合结构模型动力特性的试验研究[J].建筑结构学报,1995,16(3):37-43.
[12]邓育林,贾贤盛.大跨度悬索桥地震反应中高阶振型的影响分析[J].工程抗震与加固改造,2008,30(2):24-24,81.
[13]秦权,罗颖,孙浩.悬索桥上部结构的抗震设计[J].清华大学学报(自然科学版),1998,38(12):52-56.
[14]丁南宏,钱永久,林丽霞,等.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.
版权所有：© 2023 中国地质图书馆 中国地质调查局地学文献中心