混凝土收缩徐变对铁路高墩大跨连续刚构桥的影响研究

Study of the Effects of the Contraction-Caused Gradual Deformation of Concrete on Tall-Pier,Large-Span Continuous Rigid-Frame Railway Bridges

以某一铁路高墩大跨连续刚构桥为例,利用空间有限元计算软件MIDAS/Civil建立了该桥仿真模型,对该桥考虑收缩徐变和不考虑收缩徐变的内力、挠度等进行了对比研究,得出了收缩徐变对铁路高墩大跨连续刚构桥的影响规律,该规律可为该类型桥梁的施工控制和结构分析提供借鉴。

With a certain tall-pier,large-span continuous rigid-frame railway bridge as a practical example,a simulation model for the bridge is established in the light of the software of the finite element method in the paper,with the internal forces and the deflexion of the bridge both when the contraction-caused gradual deformation of concrete is taken into account and when the contraction-caused gradual deformation of concrete is not taken into account compared and studied,which helps us work out the influential laws for the effects of the contraction-caused gradual deformation of concrete on the tall-pier,large-span railway bridge.These laws may serve as a useful reference for the construction control and structural analyses of bridges of the same type.