连续刚构桥施工控制参数敏感性分析

Sensitivity Analysis on Construction Control Parameters of Continuous Rigid-frame Bridge

摘要:

大跨径连续刚构桥的结构线形和应力受到多种控制参数的影响，这些参数的改变会影响桥梁合龙精度以及成桥后的结构内力。为研究大跨径连续刚构桥施工控制参数的敏感性，以四川宜宾观音岩大桥为背景，采用Midas/Civil 2019建立桥梁空间有限元模型，基于均匀试验，探讨混凝土重度、挂篮荷载、初始张拉预应力、弹性模量4个典型控制参数对桥梁最大悬臂阶段和成桥阶段位移和内力的影响。结果表明：无论是位移还是弯矩，桥梁最大悬臂阶段的最敏感参数均是挂篮荷载；成桥阶段的最敏感参数均是初始张拉预应力。分析成果可为大跨径连续刚构桥精细化施工控制提供参考依据。

Abstract:

The structural alignment and stresses of a long-span continuous rigid bridge are affected by a variety of control parameters. The changes of these parameters will affect the closing accuracy of the bridge and the internal forces of the structure after bridge completion. In order to study the sensitivity of the control parameters in the construction of a long-span continuous rigid-frame bridge, a spatial finite element model of the bridge is established by using Midas/Civil 2019 based on Sichuan Yibin Guanyingyan Bridge. According to the uniform test, the effects of four typical control parameters of concrete weight, form traveler load, initial tensioning prestress and elastic modulus on the displacements and internal forces in the maximum cantilever stage and the completion stage of the bridge are discussed. The results show that the most sensitive parameter in the maximum cantilever stage of the bridge is the form traveler load, and the most sensitive parameter in the completion stage of the bridge is the initial tensioning prestress whether displacement or bending moment. The analysis results can provide a reference for the refined construction control of long-span continuous rigid-frame bridge.