连续刚构桥主梁线形控制参数敏感性分析

Parametric Sensitivity Analysis for Geometric Control of Continuous Rigid-frame Bridge

在施工监控过程中设置合理预拱度,使连续刚构桥能够顺利合龙,以及提高桥面线形的平顺度。以康家河大桥为工程背景,用Midas/Civil建立了空间有限元模型,进行了主梁挠度的计算。根据实际可能发生的情况,分析了结构自重、预应力损失、混凝土收缩徐变、梯度温度对主梁挠度的影响。

In order to make continuous rigid frame bridge smooth closured and improve the smoothness of bridge deck line,the setting camber should be reasonable in the process of construction monitoring. This paper takes the Kangjia River Bridge as the engineering background,The space finite element model is established by Midas/civil and the main girder deflection is calculated.According to the actu-al situations,the effects of the self weight of structure,the prestressing loss,the creep and shrinkage of concrete,and the temperature gradient on the deflection of main girder were analyzed.