斜拉桥最大悬臂阶段抖振响应及其对施工人员影响

对某一斜拉桥进行最大双悬臂和最大单悬臂的空间有限元分析,采用时域分析方法,计算不同阻尼工况下,桥梁在不同攻角风作用下的抖振响应,通过频谱分析,讨论最不利施工状态下桥梁抖振响应对施工人员安全的影响。研究表明:抖振作用下的Diekemann舒适度指标值较大,对施工人员安全和桥梁施工质量均有影响,应采用一定的控制措施。

Buffeting Response and Its Effect on Construction Crew's Safety at Stage of the Longest Cantilevers of Cable-Stayed Bridge

The spatial finite element analysis is made for a cable-stayed bridge at the stage of its longest double cantilevers and single cantilever,and the buffeting response of the bridge under different damping cases and different wind attack angles is calculated by the time-domain analysis method.Further by means of the frequency spectrum analysis,the effect of the buffeting response on the construction crew's safety under the most unfavorable construction conditions is discussed.The results of the analysis and calculation reveal that the Diekemann comfort indices under the action of the buffeting are fairly great and have adverse effect on both the construction crew's safety and the bridge construction quality.Accordingly,certain control measures against the buffeting should be taken.