行波效应对大跨多塔悬索桥地震反应的影响分析
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摘要
以一座大跨3塔悬索桥为工程背景,采用时程分析法分析了行波效应对大跨多塔悬索桥地震反应的影响,比较了行波作用下不同结构体系地震反应的变化规律.研究结果表明:行波效应可能会使边塔的地震反应有较大增长,但对中塔的地震反应影响不大;行波效应对边、中塔基础及梁端位移的反应影响不大;结构体系的变化对行波效应有一定影响,当中塔由沉井基础变为桩基础时,行波效应对边塔的地震反应影响增大;而当中塔与主梁之间设置弹性索,中塔由桩基础变为沉井基础时,行波效应对中塔的地震反应影响增大.
Based on a realistic engineering project of a long-span multi-tower suspension bridge,the seismic response under seismic wave passage is analyzed.And the effect of different longitudinal connections between the middle-tower and the girder,and distinct foundations of the middle-tower on seismic wave passage effect was studied.The results indicate that seismic wave passage can amplify the seismic demand of side-towers,but has minor effects on seismic demand of middle-tower.It also has minor effects on seismic demand of foundations and the displacement of main grider.The effect of seismic wave passage on seismic demand of side-towers increments as the piles foundation of middle-tower substitute for caisson.But the effect of seismic wave passage on seismic demand of middle-towers increases as the caisson foundation of middle-tower substitute for foundation with longitudinal elasticity spring between the main-tower and the main girder.
Based on a realistic engineering project of a long-span multi-tower suspension bridge,the seismic response under seismic wave passage is analyzed.And the effect of different longitudinal connections between the middle-tower and the girder,and distinct foundations of the middle-tower on seismic wave passage effect was studied.The results indicate that seismic wave passage can amplify the seismic demand of side-towers,but has minor effects on seismic demand of middle-tower.It also has minor effects on seismic demand of foundations and the displacement of main grider.The effect of seismic wave passage on seismic demand of side-towers increments as the piles foundation of middle-tower substitute for caisson.But the effect of seismic wave passage on seismic demand of middle-towers increases as the caisson foundation of middle-tower substitute for foundation with longitudinal elasticity spring between the main-tower and the main girder.
引文
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[2]Dumanoglu A A,Brownjohn J M W,Severn R T.Seismic analysis of the fatih sultan mehmet suspen-sion bridge[J].Earthquake Engineering and Struc-tural Dynamics,1992,21:881-906.
[3]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):434-438.
[4]丰硕,项贻强,谢旭.超大跨度悬索桥的动力特性及地震反应分析[J].公路交通科技,2005,22(8):31-35.
[5]Zerva A.Response of multi-span beams to spatiallyincoherent seismic ground motions[J].EarthquakeEngineering and Structural Dynamics,1990,19:819-832.
[6]Ettouney M,Hapij A,Gajer R.Frequency-domainanalysis of long-span bridges subjected to nonuniformmotions[J].Journal of Bridge Engineering,2001(11/12):577-586.
[2]Dumanoglu A A,Brownjohn J M W,Severn R T.Seismic analysis of the fatih sultan mehmet suspen-sion bridge[J].Earthquake Engineering and Struc-tural Dynamics,1992,21:881-906.
[3]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):434-438.
[4]丰硕,项贻强,谢旭.超大跨度悬索桥的动力特性及地震反应分析[J].公路交通科技,2005,22(8):31-35.
[5]Zerva A.Response of multi-span beams to spatiallyincoherent seismic ground motions[J].EarthquakeEngineering and Structural Dynamics,1990,19:819-832.
[6]Ettouney M,Hapij A,Gajer R.Frequency-domainanalysis of long-span bridges subjected to nonuniformmotions[J].Journal of Bridge Engineering,2001(11/12):577-586.
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