约束条件下混凝土基础面层开裂应力分析及相应措施研究  

Stress Analysis and Corresponding Countermeasures of Concrete Foundation Cracking Under Constraint Condition

作　　者：陈洪 吴剑剑[3] 廖开星 张承志 彭先兵 CHEN Hong;WU Jian-jian;LIAO Kai-xing;ZHANG Cheng-zhi;Peng Xian-bing(School of Civil Engineering and Architecture,Wuhan University of Technology,Wuhan 430070 China;Suzhou Concrete and Cement Products Research Institute Co.,Ltd.,Suzhou 215004,China;Suzhou Nuclear Power Research Institute Co.,Ltd.,Suzhou 215004,China)

机构地区：[1]武汉理工大学土木工程与建筑学院,湖北武汉430070 [2]苏州混凝土水泥制品研究院有限公司,江苏苏州215004 [3]苏州热工研究院有限公司,江苏苏州215004

出　　处：《混凝土与水泥制品》2022年第10期7-11,16,共6页China Concrete and Cement Products

摘　　要：为解决风机基础修补加固时混凝土面层出现开裂的问题,运用弹性力学方法计算了圆环形基础在中心受钢筒约束条件下面层修补加固混凝土中的应力状况,通过结构参数的代入,建立了弹性力学计算方程,并进行了弹性力学分析。结果表明:在基础环钢筒的约束下,面层修补加固混凝土的早期收缩和温度变形会产生较大的约束拉应力;当该拉应力大于混凝土的抗拉强度时,会导致混凝土开裂。此外,给出了消减约束应力的相应措施和所涉及到的相应技术参数,以削弱该约束应力,使其在整个发展期均小于混凝土的抗拉强度,可为此类混凝土基础面层开裂问题研究提供借鉴。In order to solve the problem of concrete surface cracking during the repair and reinforcement of the wind-powder tower concrete foundation,the elastic mechanics method was used to calculate the stress state of the repaired and strengthened concrete layer of the annular foundation under the constraint condition of the steel cylinder in the center.Mechanics equations were calculated,and elastic mechanics analysis was carried out.The results show that under the constraint of the foundation ring steel cylinder,the early shrinkage and temperature deformation of the repaired and strengthened concrete of the surface layer will generate a large constrained tensile stress,which is greater than the tensile strength of the concrete,and then cause the concrete to crack.In addition,the corresponding measures to reduce restraint stress and related technical parameters are given to weaken the restraint stress and make it less than the tensile strength of concrete in the whole development period,which can provide reference for the study of such concrete foundation surface cracking problems.

关 键 词：混凝土基础 面层修补加固 弹性力学 约束应力 裂缝 

分 类 号：TU528.1[建筑科学—建筑技术科学]