基于收缩徐变效应的大跨PC连续梁桥施工控制研究  

Construction Control of Long Span PC Continuous Beam Bridge Based on Shrinkage and Creep Effect

作　　者：黄兴亮 HUANG Xingliang

机构地区：[1]中铁十八局集团第五工程有限公司,天津300450

出　　处：《辽宁省交通高等专科学校学报》2024年第6期1-4,共4页Journal of Liaoning Provincial College of Communications

摘　　要：针对现有研究较少从实际桥梁入手探讨混凝土收缩徐变效应所产生的影响,借助有限元分析软件Midas Civil模拟分析了某大跨PC(预应力混凝土)连续刚构桥施工全过程的徐变效应,从结果看,成桥阶段混凝土收缩徐变效应对桥梁上部结构挠度影响最大,且混凝土收缩徐变效应的影响随龄期增长而增大,但随着龄期增长,其影响程度逐渐下降;此外,混凝土收缩徐变效应对悬臂梁根部截面顶板应力的影响要大于截面底板,且该种收缩徐变将导致悬臂梁根部截面产生较大挠度,使得桥梁结构产生一定形变。可得出结论:在桥梁的施工设计时应重点关注悬臂梁根部截面顶板,并充分考虑混凝土收缩徐变对桥梁结构的影响。In view of the fact that few existing studies start from the actual bridge performance to discuss the impact of concrete shrinkage and creep effect,the creep effect of a large-span pc(prestressed concrete)continuous rigid frame bridge during the whole construction process was simulated and analyzed with the help of finite element analysis software Midas Civil.The shrinkage and creep effect of concrete has the greatest influence on the deflection of bridge superstructure,and the influence of concrete shrinkage and creep effect increases with the increase of age,but the influence degree decreases with the increase of age.In addition,the effect of concrete shrinkage and creep on the roof stress of the cantilever beam root section is greater than that of the bottom section,and this kind of shrinkage and creep will cause a large deflection of the cantilever beam root section,resulting in a certain deformation of the bridge structure.It can be concluded that the roof at the root section of cantilever beam should be paid more attention in the design of bridge construction,and the influence of concrete shrinkage and creep on the bridge structure should be fully considered.

关 键 词：大跨PC连续梁 收缩徐变 数值模拟 应力分析 

分 类 号：U445[建筑科学—桥梁与隧道工程]