行波激励下多塔自锚式悬索桥地震响应规律
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摘要
多塔自锚式悬索桥为新型桥梁结构,结构静动力性能十分复杂。以某三塔自锚式悬索桥工程为研究背景,建立三维数值分析模型,基于时程分析法研究不同视波速的行波效应对多塔自锚式悬索桥地震响应的影响规律。研究结果表明:边中塔身内力、塔顶索鞍抗滑系数、边跨主梁内力等地震响应均受行波效应的影响较大,而主缆、吊索及桥墩内力则受行波效应的影响则较小;不同视波速下的行波效应影响程度各不相同。总的来说,行波效应对多塔自锚式悬索桥的影响规律十分复杂,还需要进行进一步深入探讨。
A project of three-tower self-anchored suspension bridge(TSSB) was taken as research background in this paper and its numerical model was established.The influence law of wave passage effect on seismic response of TSSB was discussed by method of time history analysis.The results showed that internal forces of main tower,safety factors against saddles sliding and internal forces of girder for side spans were affected obviously by wave passage effect,but internal force of cables,slings and piers were not sensitive to it.And the influence degree of wave passage effect under different apparent wave velocities was quite different.Overall,wave passage effect should be considered in seismic analysis of multi-tower self-anchored suspension bridge.
A project of three-tower self-anchored suspension bridge(TSSB) was taken as research background in this paper and its numerical model was established.The influence law of wave passage effect on seismic response of TSSB was discussed by method of time history analysis.The results showed that internal forces of main tower,safety factors against saddles sliding and internal forces of girder for side spans were affected obviously by wave passage effect,but internal force of cables,slings and piers were not sensitive to it.And the influence degree of wave passage effect under different apparent wave velocities was quite different.Overall,wave passage effect should be considered in seismic analysis of multi-tower self-anchored suspension bridge.
引文
[1]张超.三塔自锚式悬索桥动力特性及地震响应研究[D].福州:福州大学,2011.
[2]何庆祥,沈祖炎.结构地震行波效应分析综述[J].地震工程与工程振动,2009,29(1):50-57.
[3]项海帆.斜张桥在行波作用下的地震反应分析[J].同济大学学报,1983(2):1-9.
[4]SOYLUK K,SICACIK E A.Soil-structure interaction analysis of cable-stayed bridges for spatially varying ground motion components[J].Soil Dynamics and Earthquake Engineering,2012,35:80-90.
[5]焦常科,李爱群,操礼林,等.三塔悬索桥行波效应研究[J].土木工程学报,2010,43(12):100-106.
[6]邓育林,何雄君.行波效应对大跨多塔悬索桥地震反应的影响分析[J].武汉理工大学学报:交通科学与工程版,2011,35(3):443-447.
[7]MWAFY A,KWON O S,ELNASHAI A,et al.Wave passage and ground motion incoherency effects on seismic response of an extended bridge[J].Journal of Bridge Engineering,2011,16(3):364-374.
[2]何庆祥,沈祖炎.结构地震行波效应分析综述[J].地震工程与工程振动,2009,29(1):50-57.
[3]项海帆.斜张桥在行波作用下的地震反应分析[J].同济大学学报,1983(2):1-9.
[4]SOYLUK K,SICACIK E A.Soil-structure interaction analysis of cable-stayed bridges for spatially varying ground motion components[J].Soil Dynamics and Earthquake Engineering,2012,35:80-90.
[5]焦常科,李爱群,操礼林,等.三塔悬索桥行波效应研究[J].土木工程学报,2010,43(12):100-106.
[6]邓育林,何雄君.行波效应对大跨多塔悬索桥地震反应的影响分析[J].武汉理工大学学报:交通科学与工程版,2011,35(3):443-447.
[7]MWAFY A,KWON O S,ELNASHAI A,et al.Wave passage and ground motion incoherency effects on seismic response of an extended bridge[J].Journal of Bridge Engineering,2011,16(3):364-374.
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