大跨PC曲线连续刚构桥空间特性及收缩徐变影响分析

Impact Analysis of Spatial Characteristics and Shrinkage & Creep of Large-span PC Curved Continuous Rigid Frame Bridge

为明确曲线连续刚构桥的空间特性及收缩徐变对其产生的影响,文章以某大桥为工程背景,采用桥梁通用软件Midas/Civil建立空间有限元模型,分析了大跨PC曲线连续刚构桥最大悬臂阶段和成桥阶段主梁自重、预应力、混凝土徐变对主梁内力、关键截面应力及主梁空间变形的影响,同时考虑混凝土收缩徐变为长期效应,计算了随着服役期的增长收缩徐变对曲线连续刚构的影响规律,研究成果可为曲线连续刚构桥的设计和施工提供参考。

In order to determine the spatial characteristics of curved continuous rigid frame bridge and its impact from shrinkage and creep,with a bridge as the engineering background,this article established the spatial finite element model by using the general bridge software Midas/Civil,analyzed the impact of main beam weight,prestressing force,and concrete creep on the internal force of main beam,the stress of critical sections and the deformation of main beam space at the largest cantilever stage and bridge completion stage of large-span PC continuous curve rigid frame bridge,while considering that the concrete shrinkage and creep is the long-term effect,it calculated the influence rules of shrinkage and creep on the curved continuous rigid frame as the growth of service period,and the research results can provide the reference for the design and construction of curved continuous rigid frame bridge.