Study On Properties Of Steel Reinforced Concrete For Large Cantilever Structure

Steel reinforced concrete,also known as reinforced concrete,is a type of reinforced concrete.Steel-concrete structure(also known as SRC structure)belongs to a new form of steel-concrete composite structure,that is,the concrete is placed around the profile steel and the concrete is poured,so that the two parts of the section steel and the reinforced concrete are integrated.In the steel reinforced concrete structure,different materials bear different functions.The steel mainly bears the tensile effect.The concrete mainly bears the compressive effect.The performance of the whole combined structure is better than that of the superposed steel reinforced concrete of these two materials,which has strong bearing capacity and high rigidity.The seismic performance is good;the cross-sectional area is relatively small,saving building materials;the construction is convenient,and the construction progress is accelerated.Research on steel reinforced concrete is of great significance for practical engineering,especially for high-rise buildings.Based on the actual project,this paper studies the design of the proportion of steel-concrete concrete,and determines the benchmark,laboratory and construction mix ratio.According to the construction ratio of the formed steel reinforced concrete specimens,the axial compression performance and shrinkage defor mation performance were verified.The maximum values of axial compression and shrinkage were 5430 k N and 142×10-6,respectively.After analyzing and discussing the data obtained from the test,the influence of two variables of water-binder ratio and mineral admixture on the durability of steel-reinforced concrete was investigated.The optimum durability of steel-reinforced concrete with the best water-to-binder ratio of 0.28 was determined.Subsequently,the strength grade of the steel reinforced concrete ma trix,the anchorage length of the section steel and the thickness of the concrete protective layer were studied.The anchorage length of the steel and the thickness of the concrete protective layer,through the data analysis obtained by the relevant loadin g test,found that the concrete strength grade of the internal structure of the steel reinforced concrete mainly affects the initial bond strength and the effective bond strength,and has positive correlations.The strength and residual bond strength have little effect and even have weak inverse correlations;The greater the thickness of the steel protective layer,the initial bond strength,effective bond strength and residual bond strength will increase with different degrees,but it has little effect on the ultimate bond strength of the test piece;the test piece medium steel The anchor length is increased,which can improve the effective bond strength and initial bond strength of the test piece,while the ultimate bond strength and residual bond strength are basically unaffected.