Experimental Research On The Bond-Slip Aggregate Concrete Pipe Lightweight

Steel pipe concrete is steel pipe hoop concrete short.It is the concrete filled into the thin-walled steel pipe formed by the combination of structural materials,is a special form of concrete constraints.The concrete-filled steel tubular structure has the advantages of high bearing capacity and seismic performance,fast and simple construction,less space occupied,small structural weight and good economic effect,and has good engineering application prospect.The lightweight aggregate concrete is a new type of composite structure which is filled with high strength lightweight aggregate concrete in steel pipe.It has the advantages of high strength,good ductility and light weight.It is applied to bridge engineering with remarkable economic and Social application benefit.The research on the mechanical properties of steel tubular lightweight aggregate concrete column is needed,and the relevant data such as the analysis of bond slip and slump of the lightweight aggregate concrete column are needed.The research work is concerned with the research on the lightweight aggregate concrete The column has important theoretical significance and practical value.In this paper,the interfacial bonding properties of lightweight aggregate concrete are studied deeply from the experimental point of view.In this paper,the experiment is divided into two parts,the first is the steel pipe lightweight aggregate concrete column specimen for the axial launch test;then cited the relevant literature ordinary steel pipe binder slip test data and comparative analysis.This article specifically done the following aspects of the work:(1)through the introduction of steel pipe lightweight aggregate concrete column test,the resulting displacement-load curve of the development of the decline in the main reason is that the steel pipe lightweight aggregate concrete and the core concrete between the mechanical bite force generated The maximum bond load is greater than(or less than)the initial friction between the steel pipe and the core lightweight aggregate concrete interface.(2)According to the steel pipe lightweight aggregate concrete "launch test",when the component displacement-load curve developed to the friction phase,the steel pipe tightening coefficient is relatively large,steel and core lightweight aggregate concrete friction between the greater;(3)According to the steel pipe lightweight aggregate concrete "launch test",when the specimen length ratio is consistent,the hoop coefficient on the bond failure strength and its corresponding displacement have a certain impact,the component of the hoop coefficient and stick The variation of the joint strength is the same,which is opposite to the change of the corresponding displacement.(4)According to the steel pipe lightweight aggregate concrete "launch test",steel pipe lightweight aggregate concrete,in the case of the same hoop coefficient,the slenderness ratio of the corresponding specimen,the corresponding bond damageintensity corresponding to the displacement.(5)The weight ratio of ordinary concrete-filled steel tube is the same,and the corresponding displacement of bond-breaking load increases gradually with the increase of slenderness ratio,which is the same as that of steel pipe lightweight aggregate concrete with respect to slenderness ratio and bond failure load.