大跨径刚构连续梁桥悬臂施工阶段抗风性能

摘要

For the three-span rigid-frame continuous bridge with main span of 160 m in Changbai Mountain International Tourism Resort,the dynamic characteristics in each cantilever construction stage was calculated using Midas Civil software,and the characteristics of the vibration mode and frequency of each construction stage were analyzed.First,according to the climate condition at the bridge site,the gust wind speed was calculated,then the wind field area was simulate using Midas FEA software CFD module.Second,the three component coefficient of the maximum cantilever state of the bridge structure was calculated,and then the static gust was obtained.Finally,the simplified calculation method of buffeting force is adopted to analyze the buffeting force of the bridge under the maximum cantilever state,and the safety of the structure under the maximum cantilever state and wind load was evaluated.%依托长白山国际旅游度假区主跨160 m三跨刚构连续梁桥工程,利用Midas Civil软件对依托工程各悬臂施工阶段的动力特性进行计算,分析各个施工阶段的振型和基频的变化规律.根据桥址处的气候条件,计算阵风风速,利用Midas FEA软件CFD模块模拟风场区域,计算桥梁结构最大悬臂状态三分力系数,进而求得静阵风荷载.采用抖振力的实用简化计算方法进行桥梁最大悬臂状态抖振力分析.验算了在风荷载作用下最大悬臂状态结构的安全性.