跨江高墩刚构桥施工期地形风致响应分析

Static Wind Response Analysis of High-pier Rigid Frame Bridge Across River

跨江高墩刚构桥在悬浇施工过程中,主桥箱梁受力较为复杂,为最不利状态,为了研究地形风对施工期跨江高墩刚构桥的影响,以东溪河大桥为工程背景,利用前处理软件Gambit对东溪河大桥最大悬臂端阶段和桥址附近地形建立三维数值模型,利用后处理软件Fluent对桥址附近风场进行数值模拟分析,计算出主桥箱梁静力三分力系数,分析风荷载对主桥箱梁的影响。基于Midas/Civil建立东溪河大桥有限元模型,模拟桥梁在风荷载作用下,对跨江高墩刚构桥在施工期风荷载响应进行研究。

In the process of cantilever construction of high-pier rigid frame bridge across the river,the stress of main bridge box girder is more complex,which is the most unfavorable state.In order to study the influence of topographic wind on the high-pier rigid frame bridge,taking"Dongxi River Bridge"as the engineering background,a three-dimensional numerical model of the maximum cantilever end stage and near the bridge site of"Dongxi River Bridge"was established by using the preprocessing software"Gambit".The post-processing software"Fluent"was used to simulate the wind field near the bridge site,and the static three component force coefficient of the main bridge box girder was calculated,and the influence of wind load on the main bridge box girder was analyzed.Based on Midas/Civil,the finite element model of"Dongxi River Bridge"was established to simulate the changes of displacement,internal force and stress of box girder of main bridge under wind load.The wind load response of high pier rigid frame bridge across the river during construction period was studied.