| 多跨连续斜桥动力特性分析 |
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| 引用本文： | 夏桂云,李传习,张建仁.多跨连续斜桥动力特性分析[J].重庆大学学报(自然科学版),2011,34(8):121-127. |
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| 作者姓名： | 夏桂云 李传习 张建仁 |
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| 作者单位： | 长沙理工大学土木与建筑学院;西安交通大学航天航空学院; |
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| 基金项目： | 国家自然科学基金资助项目(50778024); 中国博士后科学基金资助项目(20080441177) |
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| 摘 要： | 为了解多跨连续斜桥振动频率的变化规律和冲击系数的合理取值,建立了等截面多跨斜桥振动频率求解的递推算法和斜桥振动分析的有限元列式,比较了等跨径多跨连续斜桥和不等跨径多跨连续斜桥前5阶频率的变化,分析了两跨连续斜桥的车-桥振动,给出了跨中截面挠度、弯矩的时程曲线,考察了斜度对挠度和弯矩的影响、挠度和弯矩的冲击系数随车速、斜度的变化。算例结果表明,等跨径多跨连续斜梁基频与单跨斜梁一致,单跨斜梁的高阶频率分布在多跨斜梁的高阶频率中,其间夹杂有其它振型频率,随着跨数的增加,夹杂的振型频率也越多;斜度对斜桥动力特性有重要影响;车辆的冲击效应与车速、斜没之间没有单调变化规律;挠度和弯矩的冲击系数不同。
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| 关 键 词： | 桥梁工程 斜桥 递推算法 有限元 振动频率 冲击效应 |
| 收稿时间： | 2/9/2011 12:00:00 AM |
Analysis of vibrating characteristics of multi-span continuous skew bridges |
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| XIA Gui-yun,LI Chuan-xi and ZHANG Jian-ren.Analysis of vibrating characteristics of multi-span continuous skew bridges[J].Journal of Chongqing University(Natural Science Edition),2011,34(8):121-127. |
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| Authors: | XIA Gui-yun LI Chuan-xi and ZHANG Jian-ren |
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| Institution: | XIA Gui-yun1,2,LI Chuan-xi1,ZHANG Jian-ren1 (1.School of Civil Engineering and Architecture,Changsha University of Science and Technology,Changsha 410076,Hunan,P.R.China,2.School of Aerospace,Xi'an Jiaotong University,Xi'an 710049,Shanaxi,P.R.China) |
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| Abstract: | To explore the vibrating frequencies and rational impact factors of multi-span skew bridge,the recursive algorithm of vibrating frequency and finite element formulations of static and dynamic analysis are established for uniform section multi-span continuous skew bridge.The first five order frequency changes of equal-span multi-span continuous skew bridge and unequal-span multi-span skew bridge are compared.The interaction of vehicle-bridge system for two-span skew bridge is analyzed.The history curves for ... |
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| Keywords: | bridge engineering skew bridge recursive algorithm finite element vibrating frequency impact effect |
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