单箱多室宽箱梁桥腹板剪力分配分析

Analysis on Web Shear Distribution of Single-box Multiple-cell Wide Box Girder Bridge

工程项目设计中,单箱多室宽箱梁横向桥面宽度往往大于跨度,受力情况复杂,采用常规梁单元计算分析,无法有效精确模拟横桥向箱梁受力状态。其中横桥向不同腹板的剪力分配情况,为多腹板宽箱梁横向受力的重点。为研究单箱多室宽箱梁不同腹板剪力分配的差异,建立箱梁上部实体单元有限元模型及相关对比模型。经分析可知,支座布设情况对宽箱梁多腹板剪力分配,起到至关重要的作用。

In the design of engineering projects,the crosswise deck width of sinle-box multiple-cell wide box girder is often larger than span.The stress is complex.The use of general beam element calcualtion and analysis is hard to effectively and accurately simulate the stress state of crosswise bridge to box girder,in which the shear distribution to the different webs of crosswise bridge is the key point of crosswise stress of multiple-web wide-box girder.In order to study the difference of the shear distributions of the different webs,the solid element finite element model of upper box girder and the related comparison models are established.The analysis result shows that the layout of support will act as a crucial adjective role for the multiple-web shear distribution of wide-box girder.