| 哪吒大桥地震响应分析 |
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| 引用本文： | 李杰,陈淮,栗金营,夏伟.哪吒大桥地震响应分析[J].世界地震工程,2011,27(1). |
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| 作者姓名： | 李杰 陈淮 栗金营 夏伟 |
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| 作者单位： | 郑州大学土木工程学院,河南,郑州,450001 |
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| 基金项目： | 河南省杰出人才计划项目(084200510003) |
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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。
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| 关 键 词： | 悬索桥 钢桁加劲梁 振动特性 地震响应 |
Analysis to seismic response of Nazha suspension bridge |
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| LI Jie,CHEN Huai,LI Jinying,XIA Wei.Analysis to seismic response of Nazha suspension bridge[J].World Information On Earthquake Engineering,2011,27(1). |
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| Authors: | LI Jie CHEN Huai LI Jinying XIA Wei |
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| Institution: | LI Jie,CHEN Huai,LI Jinying,XIA Wei (School of Civil Engineering,Zhengzhou University,Zhengzhou 450001,China) |
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| Abstract: | 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 dist... |
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| Keywords: | suspension bridge steel truss girder free vibration seismic response |
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