渡槽混凝土结构施工期温控防裂研究  

Temperature control and crack prevention of concrete aqueduct during construction

作　　者：许军才[1,2] 任青文[1] 张胜[2] 

机构地区：[1]河海大学水利水电学院,江苏南京210098 [2]安徽省交通规划设计研究院,安徽合肥230088

出　　处：《合肥工业大学学报（自然科学版）》2011年第4期553-556,共4页Journal of Hefei University of Technology：Natural Science

基　　金：国家自然科学基金资助项目(50779009;51079045);国家重点基础研究发展计划973计划资助项目(2007CB714104)

摘　　要：施工期渡槽开裂是常见的工程难题,温度荷载形成的裂缝是渡槽开裂的主要原因,特别是高性能泵送混凝土广泛施工,混凝土开裂问题变得更加突出。文章采用三维有限单元法对施工期某渡槽进行了非稳定温度场和应力场仿真计算,分析了主梁、次梁、底板、墙体裂缝的成因;针对裂缝成因,提出相应的内部水管降温和外部保温的抗裂方法,结果表明合理得当的温控方法能有效抵制裂缝的形成。Aqueduct crack is a common engineering problem during construction.The temperature load is the major factor to generate crack,especially as the high performance pump concrete is widely used,the problem becomes more serious.The three-dimensional finite element method is adopted to simulate the instable thermal field and stress field of concrete aqueduct during construction and the generation mechanics of cracks in main beam,junior beam,floor plate and wall body are analyzed.In view of the crack generation mechanics,the relevant countermeasures of external heat preservation and internal pipes cooling are put forward.The result indicates that the presented temperature control measures are effective in anti-crack.

关 键 词：温度荷载 高性能混凝土 温度场 应力场 

分 类 号：TV315[水利工程—水工结构工程]