收缩对分期浇筑砼箱梁受力性能的影响分析  

Analysis of Influence of Shrinkage on Mechanical Behavior of Layered Pouring Concrete Box Girder

作　　者：孙增寿[1] 唐一瑞 王涛 SUN Zengshou;TANG Yirui;WANG Tao(Department of Traffic Engineering,School of Civil Engineering,Zhengzhou University,Zhengzhou 450001,China)

机构地区：[1]郑州大学土木工程学院交通工程系,郑州450001

出　　处：《结构工程师》2020年第4期151-155,共5页Structural Engineers

摘　　要：针对实际工程中预应力钢筋混凝土箱梁分层浇筑的情况,考虑箱梁上下层收缩不同步,可能对混凝土箱梁受力性能产生影响。采用有限元方法建立箱梁的实体有限元模型,分析研究收缩应变对分期浇筑混凝土箱梁受力性能的影响规律。研究表明,分期浇筑对箱梁受力性能的影响较大,分期浇筑时间间隔越长对箱梁受力性能的影响越大,龄期越长对未加载箱梁受力性能的影响也越大。In this paper,for the prestressed reinforced concrete box girder with layered pouring in practical engineering,considering that the shrinkage of the upper and lower layers of the box girder is not synchronized,it may have an effect on the mechanical behavior of the concrete box girder.The finite element method is used to establish the solid finite element model of box girder,and the effect of shrinkage strain on the mechanical performance of concrete box girder is analyzed.The research shows that the effect of stage pouring on the mechanical performance of box girder is great.The longer the time interval of the stage pouring is,the greater the influence on the mechanical performance of the box girder is.The longer the age is,the greater the influence on the stress performance of the unloaded box girder is.

关 键 词：分期浇筑 箱梁 收缩 受力性能 

分 类 号：U441[建筑科学—桥梁与隧道工程]