TIME DOMAIN BUFFETING ANALYSIS OF SUSPENSION BRIDGES SUBJECTED TO TURBULENT WIND WITH EFFECTIVE ATTACK ANGLE
TIME DOMAIN BUFFETING ANALYSIS OF SUSPENSION BRIDGES SUBJECTED TO TURBULENT WIND WITH EFFECTIVE ATTACK ANGLE
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DOI：
10.1006/jsvi.1999.2801
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发表时间：
2000-06
影响因子：
4.7
通讯作者：
Q. Ding;P.K.K. Lee;S. H. Lo
中科院分区：
文献类型：
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作者：
Q. Ding;P.K.K. Lee;S. H. Lo
摘要悬索桥是一种大跨度柔性结构，容易受到抖振等各种风致振动的影响。建立了考虑有效攻角的悬索桥三维有限元模型，分析了考虑有效攻角时悬索桥的风振特性。该模型充分考虑了拉索垂度、桥面和桥塔中的力-弯矩相互作用以及大位移引起的桥梁线形变化等各种几何非线性的来源。利用计算机仿真技术将包括抖振荷载和自激荷载在内的风荷载转换到时间域中，形成气动阻尼阵和刚度矩阵以及单元荷载向量。此外，为了研究湍动风有效攻角的瞬时变化对桥梁抖振响应的影响，建立了更为精细的风荷载模型。通过算例将计算结果与经典抖振理论的计算结果进行比较，验证了该方法的有效性。
Abstract Suspension bridges are long-span flexible structures susceptible to various types of wind-induced vibrations such as buffeting actions. In this paper, a three-dimensional finite element model formulated to deal with suspension bridges under turbulent wind with effective attack angle is presented. In this model, all sources of geometric non-linearity such as cable sag, force-bending moment interaction in the bridge deck and towers as well as changes in bridge geometry due to large displacements are fully considered. The wind loads which include buffeting loads and self-excited loads are converted into the time domain by using a computer simulation technique to form aerodynamic damping and stiffness matrices as well as element loading vectors. Furthermore, a more refined model of wind loads is constructed in order to investigate the effect of an instantaneous change in effective attack angle of turbulent wind on bridge buffeting response. By comparing the results with those obtained by classic buffeting theory through an example bridge, the validity of the presented method is verified.