山区大跨悬索桥考虑空间变异性的地震响应
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摘要
以一座在建的山区大跨悬索桥为研究对象,采用基于规范设计反应谱迭代拟合法合成一致激励、行波效应以及多点激励三种工况下的位移时程,并作为该桥地震动输入。采用两水准设防抗震设计方法,分别按纵向+竖向、横向+竖向对其进行线性和几何非线性地震时程分析,计算了主塔弯矩和剪力响应。分析结果表明:沿纵桥向,多点激励的影响较大;沿横桥向,三种工况结果相差较小,且线性与几何非线性分析结果较接近。
The montanic long-span suspension bridge abuilding is taken as an example,the iterative fitting method which is compatible with design response spectrum is adopted to respectively simulate the uniform excitation,wave passage effect and multi-point excitation,which are in turn used as the earthquake ground motions input for the suspension bridge.According to two-phase aseismic fortification criterion,linear and nonlinear seismic time-history analyses are carried out under two kinds of combinations of earthquake ground motion inputs,i.e.,the longitudinal & vertical directions and the lateral & vertical directions,the peak bending moment and shearing force distributions of the main tower are calculated.The analysis shows that the multi-support excitation effect affects greatly in the longitudinal bridge direction while the result of three cases is almost the same in the lateral bridge direction,and calculation results of the linear and nonlinear analyses are very close.
The montanic long-span suspension bridge abuilding is taken as an example,the iterative fitting method which is compatible with design response spectrum is adopted to respectively simulate the uniform excitation,wave passage effect and multi-point excitation,which are in turn used as the earthquake ground motions input for the suspension bridge.According to two-phase aseismic fortification criterion,linear and nonlinear seismic time-history analyses are carried out under two kinds of combinations of earthquake ground motion inputs,i.e.,the longitudinal & vertical directions and the lateral & vertical directions,the peak bending moment and shearing force distributions of the main tower are calculated.The analysis shows that the multi-support excitation effect affects greatly in the longitudinal bridge direction while the result of three cases is almost the same in the lateral bridge direction,and calculation results of the linear and nonlinear analyses are very close.
引文
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[2]Abdel-Ghaffar A M,Rubin L I.Suspension bridge response to multiple-support excitations[J].ASCE Journal of Engineering Mechanics Division,1982,108(EM2):419―435.
[3]Dumanoglu A A,Soyluk K.A stochastic analysis of long span structures subjected to spatially varying ground motions including the site-response effect[J].Engineering Structures,2003,25:1301―1310.
[4]屈铁军,王前信.多点输入地震反应分析研究的进展[J].世界地震工程,1993,11(1):30―36.Qu Tiejun,Wang Qianxin.Progress in studies of seismic response analysis under multiple support excitations[J].Journal of World Seismic Engineering,1993,11(1):30―36.(in Chinese)
[5]范立础,王君杰,陈玮.多点地震激励下大跨度斜拉桥的响应特征[J].计算力学学报,2001,18(3):358―363.Fan Lichu,Wang Junjie,Chen Wei.Response characteristics of long-span cable-stayed bridges under non-uniform seismic action[J].Journal of Computational Mechanics,2001,18(3):358―363.(in Chinese)
[6]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 B02-01-2008,Guidelines for seismic design of highway bridges[S].Beijing:China Communications Press,2008.(in Chinese)
[7]范立础.桥梁抗震[M].上海:同济大学出版社,1997.Fan Lichu.Seismic resistance of bridges[M].Shanghai:Tongji University Press,1997.(in Chinese)
[8]Ren Weixin,Blandford G E.suspension bridge II:Finite-element model and free vibration response roebling[J].Journal of Bridge Engineering,2004,9(2),110―118.
[9]Shama A.Simplified procedure for simulating spatially correlated earthquake ground motions[J].Engineering Structures,2007,18(7):248―258.
[10]Kiureghian A D.A coherency model for spatially varying ground motions[J].Earthquake Engineering and Structural Dynamics,1996,25(1):99―111.
[11]Harichandran R S,Vanmarcke E H.Stochastic variation of earthquake ground motion in space and time[J].ASCE Journal of Engineering Mechanics,1986,112(2):154―174.
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