Numerical Simulation Research Of Bond Behavior Between Glass Aggregate Concrete And Steel Bar

Glass aggregate concrete(GAC)is a new type green building material.In actual practice,the basic properties of the glass aggregate concrete are focus on the research of compressive strength,the splitting tensile strength and the modulus of elasticity.In addition,the study on the bonding properties between glass aggregate concrete and steel is also crucial,which has a great influence on the structure design and practical application.Based on the half beam tests,this paper focuses on numerical simulation study of bonding properties between glass aggregate concrete and steel.Verifying the bond slip constitutive relation between glass aggregate concrete and steel,analyzing the the change regulation of bond slip curve,anchorage characteristic value and stress distribution of steel between glass aggregate concrete and steel and comparing with the normal concrete,further research on the bond characteristics between glass aggregate concrete and steel,which provide reference for the engineering practice and structure design of glass concrete.This article mainly finished the following work:(1)Based on the half beam tests,using ABAQUS software to build a finite element model and stimulate the adhesion between glass aggregate concrete and steel by introducing the nonlinear spring element.ABAQUS software contains no nonlinear spring function module,but it can add nonlinear spring element and bond slip constitutive model to corresponding grid nodes by editing the INP files.Contrasting the bond slip constitutive model of different norms and scholars at home and abroad,this paper uses the bond slip constitutive model between steel and concrete from domestic Code for Design of Concrete Siructure.(2)This paper analyzed the image and data by contrasting the results of the half beam tests.Studying the relationship between the bond slip curves and the constitutive models of glass coarse and fine aggregate concrete under different replacement rates,and the change regulation of the bond anchorage eigenvalue with the replacement rate of aggregate was analyzed.The results show that the bond slip constitutive model between steel and concrete obtained by finite element simulation is approximately the same as the experimental results.It consists of four stages:elastic section,splitting section,descending section and residual section.The difference of the results of the half beam tests is that there is a micro slip section at the beginning of the test,and producing the initial bond stress.Through contrasting the change regulation of the anchorage characteristics from test and simulation,it is found that the change regulation of the glass fine aggregate concrete is in agreement with the test,but the glass coarse aggregate concrete is different;The ultimate bond stress and relative limit bond stress of glass fine aggregate concrete are greater than that of glass aggregate concrete.(3)A comprehensive analysis of stress cloud map of concrete main tensile stress and drawing reinforcement,and drawing the steel stress distribution image the corresponding displacement of the free end and different positions on the bond section,which make up for the deficiency of the half beam tests.The study found that the bonding properties of glass aggregate concrete and steel are lower than the normal concrete,and producing the splitting failure.When adding glass fine aggregate reasonably,the bond performance between concrete and steel is enhanced,and glass fine aggregate concrete and steel with mass substitution rate of 25?75%has stronger bonding effect.