In light of old bridge widening staggered perforated conditions owning to river limits,combining with Guanlan separated overpass wide-ning 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 stag-gered perforated bridge after the old and the new splicing increases more,which needs adopting necessary bearing capacity reinforcement meas-ures,so as to meet bearing capacity demands.%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。
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