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多跨连续的大跨径连续刚构桥采用悬臂浇注工艺,其节段多、施工周期长、多T同时施工工艺复杂、并且很难一次合龙。由于施加预应力及墩高差异的影响,合龙顺序会引起墩顶位移和主梁线形变化的差异,直接关系到桥梁的成桥线形和受力。因此,桥梁合龙之前有必要对合龙方案进行专门研究,对合龙顺序进行优化设计,尽量减小由于合龙对桥梁带来的不利影响。以一座连续刚构桥作为工程依托,建立有限元模型模拟合龙施工过程,对不同合龙方案下成桥主梁线形、主梁应力状态及桥墩墩顶位移进行了比较分析,在此基础上进行合龙方案比选。
Multi-span continuous large-span continuous rigid frame bridge using cantilever casting process, the segment more, the construction period is long, more T while the construction process is complex, and it is difficult to co-drag. Due to the influence of prestress and pier height difference, the closing sequence will cause the difference between the top displacement and the linear change of the main girder, which is directly related to the bridge formation and stress. Therefore, it is necessary to conduct a special study on the closure scheme before the closure of the bridge, optimize the closure sequence, and minimize the adverse impact on the bridge due to the closure. Taking a continuous rigid frame bridge as the basis of engineering, a finite element model was established to simulate the construction process of the slamming, and the linear shape of the main girder, the stress state of the main girder and the top displacement of the bridge pier under different closure schemes were compared and analyzed. Based on this, Alternatives.