摘要
Abstract
In the past,the mechanical properties of recycled concrete are analyzed from a mesoscopic point of view by consider-ing the recycled concrete as a composite material consisting of five medias(aggregate,new mortar,new interface,old mortar, and old interface).In order to simplify the conventional five-phase recycled concrete model,a new method,base force element method(BFEM)based on interface equivalent model is provided.Firstly,the three-phase ball theory model is used to equate the three media(old mortar,new interface and old interface)in recycled concrete into one medium,and the interface equivalent model of three media of recycled concrete is obtained;then the base force element method(BFEM)of potential energy principle is used to compile the damage program,and uniaxial tensile test of different size recycled concrete blocks is simulated.The stress-strain curves and damage process diagrams are given and compared with those from the common five-phase model, showing that the curves are basically consistent with the common.So the equivalent model can be used to replace the ordinary five-phase model,which can simplify the damage analysis of multi-phase recycled concrete and improve the simulation efficiency.关键词
混凝土与钢筋混凝土结构/再生混凝土/三相球模型/界面等效模型/基面力元法Key words
concrete and reinforced concrete structure/recycled concrete/three-phase ball model/interface equivalent model/base force element method分类
建筑与水利
