高墩大跨连续刚构桥最大悬臂阶段风致响应及其对施工人员的影响

以某高墩大跨连续刚构桥为工程背景进行了空间有限元分析,采用静力分析方法,分别计算了阵风作用下最大双悬臂施工状态下高墩桥梁和跨度相近的低墩桥梁的结构内力,并探讨了其墩底内力特点;采用时域分析方法,计算了桥梁最大双悬臂施工状态下结构的抖振响应,通过进行舒适度分析,讨论了桥梁抖振响应对施工人员安全的影响。研究结果表明:高墩刚构桥墩底的横桥向弯矩由主梁上风荷载对称加载方式决定,而低墩刚构桥则由非对称方式决定;最大双悬臂状态在抖振作用下的Diekemann舒适度指标值很小,对施工人员的工作影响不大。

The wind-induced response of high-pier long-span continuous rigid frame bridge under the longest cantilevered construction stage and its effect on workers

A spatial finite element model of high-pier long-span rigid frame bridge was presented.The gust-induced internal forces of the highpier long-span bridges and two similar span rigid frame bridges with low piers were computed with static analytical method,then characteristics of the internal forces of high piers and low piers were investigated.The buffeting responses of the bridge under the longest cantilevered construction stage were also calculated with time-domain method and effects on the workers' safety were discussed according to the Diekemann values.The results show that the lateral moment at the bottom of piers is up to the load model of symmetrical wind loads in the high-pier rigid frame bridges,however,it is determined by the nonsymmetrical load model in the low-pier ones.The Diekemann values of the bridge under buffeting forces usually are small,showing that the buffeting response has a little effect on the workers' safety and work.