Experimental Research On The Axial Compression Performance Of Steel Reactive Powder Concrete Full-scale Columns

With the increasing social economy,our country civil engineering structures such as buildings,highways,bridges,and water conservancy have already developed to a high level.High-rise and super-high-rise buildings have risen from the ground,and highway bridges such as cross-mountain and sea-crossing have come to our country.The requirements for vertical load-bearing component columns that bear heavy loads have become more stringent,and ordinary reinforced concrete structures have long been difficult to apply.Therefore,in order to efficiently and greatly improve the bearing capacity and durability of the vertical member column,this paper combines the excellent performance of RPC with the section steel,and proposes a steel reactive powder concrete composite structure with excellent stress performance(Steel Reactive Powder Concrete,referred to as SRPC),opening up new horizons for civil engineering construction.This article first discusses the domestic and foreign RPC and section steel concrete structures.Secondly,five full-scale SRPC columns with a height of 3m are tested under axial compression by using RPC strength grade and section size of section steel(steel content)as parameter variables,investigating the damage and destruction process of the specimen,measuring the axial displacement,strain and ultimate bearing capacity,and studying the influence of RPC strength and steel flange size(steel content)on the mechanical properties of the SRPC full-scale specimen.Then,finite element analysis was performed on the SRPC specimen by ABAQUS,analyzing the experimental results and simulation results.The results of the two are basically the same.And then extending simulation analysis of different parameters in the same modeling method,including the influence of the strength of the section steel,the high RPC strength,the steel content and so on among the mechanical performance of SRPC.The simulation and experimental results show that the final failure of the SRPC full-scale specimen is the split failure at the end of the column,the RPC and the section steel work together,and the strength of the two can be fully exerted during the load process.The lateral effect of RPC on section steel and the restraint of RPC in the core area by the combination of stirrups and section steel can greatly increase the ultimate bearing capacity of SRPC full-scale columns,increasing with the increase of RPC strength.The confinement effect of RPC in the closed loop of the core area improvs with the enlargement of the size of the steel flange,that is,the bigger the size of the steel flange,the greater the load that the RPC in the core area can share,and the greater the ultimate bearing capacity of the SRPC full-scale column.RPC strength is the main factor that affects the ultimate bearing capacity of SRPC.The steel content can significantly affect the restraint effect of RPC in the core area.In the initial elastic stage of loading,the strength of section steel has a greater impact on the mechanical properties of the specimen.Finally,based on the existing domestic technical regulations on steel-concrete,considering the restraint effect of stirrups and section steel on the RRC of the core area,a calculation method for the axial bearing capacity of full-scale columns is proposed,which provides a certain theoretical basis for engineering construction design.