基于连续箱梁桥错孔拓宽方式拼接内力分析

Analysis on internal splicing force on the basis of staggered perforated and widening method of continuous box girder bridge

针对桥梁拓宽新旧桥由于河道限制桥梁需错孔布置的情况,结合观澜分离立交桥的拓宽实际,利用Midas/Civil进行拓宽仿真模拟,分析了错孔桥梁拼宽前后新、旧主梁各关键截面在各荷载工况下的内力,指出错孔桥梁在新旧拼接后旧桥内力增大较多,需采取必要的承载力加固措施,以满足承载力要求。

In light of old bridge widening staggered perforated conditions owning to river limits,combining with Guanlan separated overpass widening situation,the paper carries out widening simulation by applying Midas / Civil,analyzes internal force of critical old and new beam sections before the staggered perforated bridge splicing under different loading conditions,and finally points out that： the old bridge internal force of staggered perforated bridge after the old and the new splicing increases more,which needs adopting necessary bearing capacity reinforcement measures,so as to meet bearing capacity demands.