武宣县黔江特大桥关键施工阶段内力分析

Internal Force Analysis of Qianjiang Bridge in Wuxuan County at Critical Construction Phase

武宣县黔江特大桥主桥采用预应力混凝土连续刚构结构,文章综合考虑各种荷载情况,建立全桥有限元模型对该桥主桥三个关键施工阶段(最大悬臂状态、边跨合拢状态、中跨合拢状态)的内力进行了全面分析,得到了结构体系约束不断增加,墩顶最大弯矩向中跨及边跨迁移的规律,可为预应力混凝土连续刚构桥的设计及施工控制提供参考和借鉴。

Main bridge of Qianjiang Bridge in Wuxuan County used the prestressed concrete continuous rigid frame structure,this article by comprehensively considering all loading conditions established the full-bridge finite element model and conducted a comprehensive analysis on the internal force of main bridge of this bridge at three key construction stages（maximum cantilever state,side-span closure state,mid-span closure state）,and obtained the rules that the maximum bending moment of pier top migrates to the mid-span and side spans when the structure system constraints increasing,thereby providing the reference for the design and construction control of prestressed concrete continuous rigid frame bridges.