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连续刚构桥是一种多跨一联的连续结构,其一般采用悬臂浇注施工。在施工阶段,选择合理的合龙方案,既保证结构受力性能达到逼近合理状态,又兼顾施工工期与资源配置,是极其重要的一步。文章结合平寨特大桥这座5跨预应力混凝土连续刚构桥,定量分析了合龙顺序对其成桥状态的影响。利用有限元程序对5跨连续刚构桥几种常见的合龙顺序进行模拟计算,并将不同合龙顺序下的计算结果进行比较,以确定在其他因素不变时能够获得最优合理成桥状态的合龙顺序。
Continuous rigid frame bridge is a multi-span continuous structure, which is generally used cantilever casting construction. In the construction phase, it is an extremely important step to choose a reasonable closure scheme not only to ensure the mechanical performance of the structure reaches a reasonable approximation but also to meet the construction schedule and resource allocation. Combined with the 5-span prestressed concrete continuous rigid-frame bridge of Pingzhai Super Bridge, the article quantitatively analyzes the influence of the closing sequence on the state of its completion. The finite element program is used to simulate several common closing sequences of 5-span continuous rigid-frame bridge and to compare the calculation results under different closing orders to determine the optimal reasonable bridge state when other factors are constant Closure order.