Study On The Bond-slip Properties Of Angle Steel And Concrete

Ensuring the bonding between the steel and concrete is an important basis for the cooperation between the two,and can also directly affect the stress,failure,ultimate bearing capacity,stiffness,cracks and analysis methods of the structure.The steel reinforced concrete structure has high bearing capacity,high rigidity,good ductility,good energy dissipation and seismic performance,and is especially suitable for earthquake areas,especially high-rise and super-high-rise buildings in the earthquake area.Favorable,in countries such as Europe and Japan,the use of steel reinforced concrete structures is quite extensive.This paper analyzes and discusses the sliding mechanism of the bonding between angle steel and concrete in steel reinforced concrete.A total of 20 angle steel concrete members were designed and manufactured for concrete strength,embedding length and different bonding positions of angle steel.Theoretical analysis has mainly done the following research:(1)By analyzing the research results of the two types of bond-slip performance at home and abroad related reinforced concrete and steel reinforced concrete,on the basis of understanding and summarizing the current status of previous studies,according to the direction of this article,the main analysis content is proposed;(2)Based on the pull test of the angle steel,explore the mechanism of the steel-concrete concrete slip,detail the overall process of the test of the angle steel concrete pull specimen,and record the load-slip and stick of the member under different influencing factors Junction stress-slip relationship,a comprehensive analysis of the P-S curve and its characteristics of the extracted specimen.Summarize and deal with the strain measurement results of the section steel in the ascending and descending sections of the load,and analyze the two comparative test results;(3)Briefly explain the bonding slip mechanism,analyze the reliability of angle steel anchoring,and perform orthogonal regression analysis through Origin to obtain the limit state equation of angle steel's bearing capacity,which is in good agreement with the test results,indicating that this equation is feasible;(4)Analyze the influence of various influencing factors on the bonding performance between angle steel and concrete,and get the basic equation and constitutive relationship of angle steel bonding slip.Combined with the experimental analysis,the strain distribution law and position function are deduced.The two position functions F(x)and G(x)reflect the change of the bond-slip constitutive relationship along the buried length.