| 超大跨径斜拉桥斜拉索局部振动对地震反应的影响 |
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| 引用本文： | 叶爱君.超大跨径斜拉桥斜拉索局部振动对地震反应的影响[J].同济大学学报(自然科学版),2010,38(2):158-163. |
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| 作者姓名： | 叶爱君 |
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| 作者单位： | 同济大学,土木工程防灾国家重点实验室,上海,200092 |
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| 基金项目： | "十一五"国家科技支撑计划资助 |
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| 摘 要： | 在以往的斜拉桥地震反应分析中,大都采用单桁架(SECS)模型来模拟斜拉索,不能反映斜拉索的局部振动的影响.以世界第一跨度斜拉桥——苏通大桥为背景,采用多桁架(MECS)模型来分析斜拉索局部振动对超大跨度斜拉桥地震反应的影响,并探讨了斜拉索的合理单元划分方式.结果表明,斜拉索划分为10个单元已能够很好地反映斜拉索局部振动的影响.考虑斜拉索局部振动之后,会出现索梁耦合振型,减小一些振型的参与系数,基频与主梁的竖向振动相近的斜拉索在地震作用下大幅振动,而主梁和主塔的内力反应普遍减小,特别是主塔的地震轴力明显减小.
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| 关 键 词： | 斜拉桥 斜拉索局部振动 地震反应 内共振 |
| 收稿时间： | 2008/11/25 0:00:00 |
| 修稿时间： | 2009/12/28 0:00:00 |
EFFECT OF CABLE VIBRATION ON SEISMIC RESPONSE OF SUPER-LONG SPAN CABLE-STAYED BRIDGE |
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| Ye Aijun.EFFECT OF CABLE VIBRATION ON SEISMIC RESPONSE OF SUPER-LONG SPAN CABLE-STAYED BRIDGE[J].Journal of Tongji University(Natural Science),2010,38(2):158-163. |
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| Authors: | Ye Aijun |
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| Institution: | YE Aijun,SU Zhenyu(State Key Laboratory for Disaster Reduction in Civil Engineering,Tongji University,Shanghai 200092,China) |
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| Abstract: | Single-element cable system(SECS) model is usually adopted in the seismic response analysis of cable-stayed bridges,but the local vibration of cables cannot be simulated.A case study was made of the longest span cable-stayed bridge in the world,the Sutong Bridge' to investigate the effect of cable vibration on seismic response.Its analytical model was established,in which,cables were modeled with multiple-element cable system (MECS),and rational discretization manner was discussed.The results show that rati... |
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| Keywords: | cable-stayed bridge local vibration of cables seismic response internal resonance |
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