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本文以云南某连续刚构特大桥为例,通过规范理论公式及有限元软件分别计算,研究了预应力混凝土连续刚构桥在合龙前确定顶推力的计算方法及考虑因素,并对桥梁运营10年后在顶推和不顶推的情况下的墩顶、底弯矩分别进行了比较,得出连续刚构桥在合龙前增加顶推工序可有效改善桥墩后期的受力状态。
In this paper, taking a continuous rigid-frame bridge in Yunnan as an example, the calculation methods and considerations for determining the thrust before continuous closure of prestressed concrete continuous rigid frame bridge are studied through the standard theoretical formula and finite element software respectively. After comparing the top and bottom bending moment of the pier under the condition of pushing and not pushing, the conclusion is obtained that increasing the pushing process of the continuous rigid frame bridge before closing can effectively improve the post-stress state of the bridge pier.