连续梁桥合龙段施工方案优化分析

Optimal analysis of construction schemes for the closing section of continuous girder bridges

为了降低连续梁桥合龙后成桥线形和应力变化,采用有限元模拟分析确定最优施工方案。对三种连续梁桥合龙段施工方案采用MIDAS/CIVIL软件进行模拟分析,分别对主梁挠度、成桥顶面应力和底面应力进行计算,确定不同施工方案的施工效果。根据模拟分析结果,得出方案2主梁挠度较大,不建议选用。在综合考虑施工工期、施工难度、施工成本和施工精度要求等因素的情况下,确定方案1为最优方案。

In order to reduce the alignment and stress changes of the continuous beam bridge after closing,finite element simulation analysis is used to determine the optimal construction plan.MIDAS/CIVIL software was used to simulate and analyze the construction schemes of the closing section of three continuous beam bridges.The deflection of the main girder,the stress on the top surface and the stress on the bottom surface of the completed bridge were calculated separately to determine the construction effect of different construction schemes.According to the results of the simulation analysis,it is concluded that the deflection of the main girder of scheme 2 is relatively large,and it is not recommended to be used.In the case of comprehensive consideration of construction period,construction difficulty,construction cost and construction accuracy requirements and other factors,scheme 1 is determined as the optimal scheme.