| 大跨度中承式拱桥的耦合抖振有限元分析 |
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| 引用本文： | 晏致涛;李正良;黄汉杰.大跨度中承式拱桥的耦合抖振有限元分析[J].华南理工大学学报(自然科学版),2009,37(8). |
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| 作者姓名： | 晏致涛;李正良;黄汉杰 |
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| 作者单位： | 晏致涛,李正良(重庆大学,土木工程学院,重庆,400045);黄汉杰(中国空气动力研究与发展中心,四川,绵阳,621000) |
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| 摘 要： | 大跨度中承式的拱桥属于柔性空间结构，风荷载及抖振分析相当复杂。基于结构的固有模态坐标，考虑风速沿主拱高度变化，推导了桥梁结构的节点等效气动抖振力公式，进行了大跨度中承式拱桥的抖振有限元分析。该分析方法可以考虑作用于主拱的干扰风谱、风载的空间相干性及主桥及主拱的多模态耦合效应。以重庆菜园坝长江大桥为例，计算了桥梁结构节点位移和单元脉动内力功率谱密度和方差。
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| 关 键 词： | 拱桥 气动耦合 抖振响应分析 有限元法 |
| 收稿时间： | 2008-7-2 |
| 修稿时间： | 2009-1-21 |
Finite Element Anaysis of Coupled Buffeting for Long Span Half-through Arch Bridges |
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| Zhengliang Li.Finite Element Anaysis of Coupled Buffeting for Long Span Half-through Arch Bridges[J].Journal of South China University of Technology(Natural Science Edition),2009,37(8). |
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| Authors: | Zhengliang Li |
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| Abstract: | Long span arche bridges are flexible space structure. Wind loads and buffeting analysis are rather complicated. Based on the modal coordinates of structure, the formula of nodal equivalent aerodynamic buffeting forces is derived in view of wind speed varied with structure height. A finite element method for analyzing the coupled buffeting response of long span half-through bridges is proposed in this paper. The method presented can consider the disturbed spectrum of main arches and spatial coherence of natural winds and the multimode and intermode effects on the responses of main bridge and arches. For Chongqing Caiyuanba Yangzi River bridge, the power spectrum density and square deviation of nodal displacements and elemental internal forces of bridge structures are computed. |
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| Keywords: | arch bridges aerodynamic coupling buffeting response analysis finite element method |
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