混凝土结构抗力基本参数的调查统计分析

以西安市、咸阳市及其周边县市的混凝土结构为对象,对1 000余栋混凝土结构进行了现场调查,统计分析了混凝土强度、钢筋性能及构件几何参数,并重点分析了制备工艺、搅拌方法和施工水平等因素对材料性能和构件几何参数的影响。研究结果表明:自拌混凝土和商品混凝土的强度均值相近,但商品混凝土强度变异较小;除现浇板的混凝土强度值较高外,其余构件的混凝土强度接近;建筑公司的资质越高,混凝土的强度越高且变异越小。钢筋性能良好,各生产厂家性能差异不大。构件显性几何参数控制较好,但隐性几何参数控制较差且变异很大。

INVESTIGATION AND STATISTICAL ANALYSIS ON BASIC RESISTANCE PARAMETERS OF CONCRETE STRUCTURE

Taking the typical concrete buildings in Xi'an and Xianyang and their periphery county cities as research objects,more than 1 000 structures were investigated.The concrete strength,reinforcing bar properties and component dimension parameters were statistically analyzed.The influence of some factors such as preparation process,stirring method and construction level on material properties and dimension parameters were analyzed.The results show that the strength mean of commercial concrete is close to strength mean of self-mixing concrete,but the strength variation of commercial concrete is smaller.In addition to the concrete strength of floor is higher,the concrete strengths of other elements are basically the same.The higher the building company's qualification,the higher is the concrete strength and the smaller is the strength variation.Reinforcing bar properties are good and their performance difference of different manufacturers is not big.The control level of dominant geometric parameter is better,but the control level of hidden geometric parameter is poor and its variation is large.