连续刚构桥合龙顺序优化研究

Study on Closure Sequence Optimization of Continuous Rigid Frame Bridge

以里必沁水河特大桥左幅五跨连续刚构部分为依托工程,运用有限元软件建立计算模型,分析了三种合龙顺序对合龙段和成桥的内力及位移影响。根据有限元计算结果,合龙顺序的不同对成桥内力和线形有一定影响。综合分析,方案Ⅰ在合龙和成桥阶段的受力状态都较优于其余两种方案,但是差异不大。综合考虑该桥地理条件和现场施工机具及人员配备,拟采用方案Ⅰ进行合龙。

Based on the left five-span continuous rigid frame part of Libiqin Shuihe Bridge,the finite element software was used to establish the calculation model,and the effects of three closure sequences on the internal forces and displacements of the closure section and the completion bridge were analyzed.According to the results of finite element calculation,the different closure sequence has certain influence on the internal force and alignment of the completed bridge.Comprehensive analysis shows that scheme I is superior to the other two schemes at the stage of Helong and Chengqiao,but the difference is not significant.Considering the geographic conditions of the bridge and the construction equipment and staffing,scheme I is proposed to be adopted for closure.