哪吒大桥地震响应分析
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摘要
建立了哪吒大桥———钢桁加劲梁悬索桥的三维有限元计算模型,对该桥进行了振动特性和地震响应研究,对比分析了一致激励下和考虑局部场地效应、行波效应非一致激励下的桥梁地震时程响应的差异。计算结果表明,由于悬索桥的钢桁加劲梁采用半飘浮体系,纵向约束较弱,桥梁第1阶振型为钢桁加劲梁的纵飘;各阶振型的频率呈现出密集分布的形态;考虑地震波传播速度产生的行波效应的影响,桥梁的地震响应与一致激励下的地震响应有一定差异;局部场地效应对哪吒大桥的地震响应影响较大,特别是对大缆应力及结构变形影响很大;哪吒大桥在7度设防(地震波峰值加速度不超过0.15g)时,大桥的抗震安全性是可以得到保证的。
Introducing 3D model and free vibration of Nazha suspension bridge in detail,the paper analyzes seismic time-history response under uniform excitation and considering traveling wave effect and local site effect non-uniform excitation.According to analytical result,longitudinal stiffness is weaker than vertical stiffness because of half-floating system,and the first vibration mode is longitudinal floating.Traveling wave effect is non-significant to seismic response of the bridge,and local site effect is distinct to cable's stress and structural stress of seismic response of the bridge.When seismic wave acceleration is no more than 0.15g according design document's 7 degree seismic zone,the bridge is secure.
Introducing 3D model and free vibration of Nazha suspension bridge in detail,the paper analyzes seismic time-history response under uniform excitation and considering traveling wave effect and local site effect non-uniform excitation.According to analytical result,longitudinal stiffness is weaker than vertical stiffness because of half-floating system,and the first vibration mode is longitudinal floating.Traveling wave effect is non-significant to seismic response of the bridge,and local site effect is distinct to cable's stress and structural stress of seismic response of the bridge.When seismic wave acceleration is no more than 0.15g according design document's 7 degree seismic zone,the bridge is secure.
引文
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[9]李杰,李娜.自锚式悬索桥自由振动研究[J].郑州大学学报(工学版),2008,29(1):61-65.LI Jie,LI Na.Study on self-anchored suspension bridges free vibrations[J].Journal of Zhengzhou University(Engineering Science),2008,29(1):61-65.
[10]JTG/TB02-01-2008公路桥梁抗震设计细则[S].JTG/TB02-01-2008 Guidelines for Seismic Design of Highway Bridge[S].
[11]谢开仲.大跨度钢管混凝土拱桥非线性地震反应分析与研究[D].南宁:广西大学博士学位论文,2005.XIE Kaizhong.Nonlinear analysis and research of seismic response of long-span oncrete filled steel tubular arch bridges[D].Nanning:GuangxiUniversity PhD Thesis,2005.
[2]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):17-22.QIN Quan,LOU Lei.Effect of non-proportional damping on seismic responses of suspension bridges[J].China Civil Engineering Journal,1999,32(3):17-22.
[3]徐勋,任伟平,强士中.影响大跨悬索桥地震响应的敏感因素[J].华南理工大学学报(自然科学版),2008,36(11):108-113.XU Xun,REN Weiping,QIANG Shizhong.Sensitive factors to influence seismic response of long-span suspension bridge[J].Journal of SouthChina University of Technology(Natural Science Edition),2008,36(11):108-113.
[4]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)2:24-28.DENG Yulin,JIA Xiansheng.Effect of higher frequency models of vibration on seismic response of long-span suspension bridge[J].EarthquakeResistant Engineering and Retrofitting,2008,30(2):24-28.
[5]张行,李黎,龙晓鸿.大跨度悬索桥地震反应分析及其抗震性能评价[J].工程抗震与加固改造,2007,29(1):85-88.ZHANG Hang,LI Li,LONG Xiaohong.Seismic response analysis and performance evaluation of a long-span suspension bridge[J].EarthquakeResistant Engineering and Retrofitting,2007,29(1):85-88.
[6]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(自然科学版),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 University(Natural Science Edition),2001,29(1):84-88.
[7]郭迅,李洪涛,王金国.某悬索桥振动特性现场测试及数值模拟[J].世界地震工程,2008,24(3):1-6.GUO Xun,LI Hongtao,WANG Jinguo.Field measurement and numerical simulation on dynamic properties of a cable suspension bridge[J].World Earthquake Engineering,2008,24(3):1-6.
[8]刘春华,秦权.悬索桥振动特性对结构参数的灵敏度[J].清华大学学报(自然科学版),1998,38(12):48-51.LIU Chunhua,QIN Quan.Sensitivities of natural modes of suspension bridges to structural parameters[J].Journal of Tsinghua University(Sci-ence and Technology),1998,38(12):48-51.
[9]李杰,李娜.自锚式悬索桥自由振动研究[J].郑州大学学报(工学版),2008,29(1):61-65.LI Jie,LI Na.Study on self-anchored suspension bridges free vibrations[J].Journal of Zhengzhou University(Engineering Science),2008,29(1):61-65.
[10]JTG/TB02-01-2008公路桥梁抗震设计细则[S].JTG/TB02-01-2008 Guidelines for Seismic Design of Highway Bridge[S].
[11]谢开仲.大跨度钢管混凝土拱桥非线性地震反应分析与研究[D].南宁:广西大学博士学位论文,2005.XIE Kaizhong.Nonlinear analysis and research of seismic response of long-span oncrete filled steel tubular arch bridges[D].Nanning:GuangxiUniversity PhD Thesis,2005.
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