低热微膨胀混凝土预压应力研究  

Study of Precompressed Stress of Low-heat Micro-expansive Concrete

作　　者：李振富[1] 吕秀红[1] 

机构地区：[1]天津大学,天津市300072

出　　处：《水利水电技术》1999年第9期17-20,共4页Water Resources and Hydropower Engineering

摘　　要：开裂问题是混凝土工程百余年来未能很好解决的技术难题．近年出现的低热微膨胀混凝土在限制条件下以其合适的膨胀，来补偿部分或全部导致开裂的收缩，从而减轻或避免了混凝土的开裂．以低热微膨胀混凝土的补偿收缩原理为基础，根据弹性理论及弹性徐变理论，应用有限元增量法建立了预压应力仿真分析的数值模型；依照文中的理论和方法，对黄河某枢纽工程大坝基础坝块、岸坡坝段及隧洞衬砌等分别进行了预压应力仿真计算，得到了低热微膨胀混凝土在不同约束时的预压应力大小及变化规律，这对微膨胀混凝土在水利水电工程中的应用是很有意义的，The crack puzzle for concrete engineering has not been solved successfully over one hundredyears. Recently, the low-heat micro-expansive concrete in a moderate expansion under some restrictions can beused to compensate the contract length partly or totally due to the cracks in concrete. In this paper，based onthe compensation-contract principle in low-heat micro-expansive concrete, in connexion with elasticity theoryand elastic-creep theory, the numerical emulation model for precompressed stresses is given in finite element in-cremental method. Finally, the magnitude and variation feature in different restraints for low-heat micro-ex-pansive concrete are obtained. Apparently,it is of considerable interest in the application of low-heat micro-ex-pansive concrete in hydro-electric engineering.

关 键 词：微膨胀混凝土 预压应力 约束条件 仿真计算 浇筑 

分 类 号：TV431.9[水利工程—水工结构工程] TV544.6