自密实混凝土与老混凝土黏结收缩有限元分析  

A Finite Element Analysis of Adherence Between Old and Freshly Cured Self-Compacting Concrete

作　　者：陈峰[1] 郑建岚[2] 

机构地区：[1]福州大学环境与资源学院,福建福州350108 [2]福州大学土木工程学院,福建福州350108

出　　处：《中国矿业大学学报》2009年第5期660-664,共5页Journal of China University of Mining & Technology

基　　金：国家自然科学基金项目(50478003)

摘　　要：在自密实混凝土与老混凝土约束收缩试验的基础上,采用大型有限元软件ABAQUS进行了新老混凝土黏结约束收缩的有限元模拟.通过与试验结果进行比较,验证了有限元模型的可行性.并从应力分析的角度研究在约束收缩的作用下,新老混凝土黏结的应力分布规律.计算结果表明,在黏结面附近新混凝土受到明显的拉应力,而沿着试件高度方向拉应力不断减小直至转变成压应力;黏结面上的剪应力则在两端部最大,中部最小;修补混凝土较薄时新混凝土由于约束收缩而受到的拉应力较大;当新混凝土高长比为1/4时,混凝土上的拉应力最小.The effects of restrained shrinkage on adhesion was modeled with the finite element program ABAQUS.The results were compared to adhesion tests between old,cured concrete and fresh self-compacting concrete.The finite element model was shown to be correct.The stress distribution is affected by restrained shrinkage and this,in turn,affects adhesion.A tensile stress is obvious in the new concrete layer near the interface.Further from the interface the tensile stress decreases until the stress finally becomes co...

关 键 词：新老混凝土 约束收缩 黏结 有限元 应力分布 

分 类 号：TU528[建筑科学—建筑技术科学]