大跨度桥梁耦合抖振响应的时域分析

Time-Domain Analysis for Coupled Buffeting Response of Long Span Bridges

提出了一个大跨度桥梁的耦合抖振时域分析方法．作用于桥面上的风荷载被转化到时域中．以汕头海湾大桥为工程背景，用文中方法的计算结果与频域反应谱理论以及紊流场中全桥模型风洞试验结果相当吻合．另外，本文方法计及有效攻角的瞬时变化和紊流对自激力的影响，显示出频域反应谱方法所不具备的优点．

in the analysis, a method in the time domain is proposed. Buffeting forces are simulated as multi--correlated random processes and self-excited forces are expressed according to impulse functions. The results from three different ways show that the proposed method is reliable. On this basis, the influence of effective angle of attack on buffeting response is investigated.