Study On The Axial Compression Performance Of High Strength Reinforced Concrete Columns Confined By Expanded Steel Mesh

With people’s pursuit of quality of life,people are gradually paying attention to the safety of various buildings in the living environment.Since high-strength concrete can make the structure more stable and safe,the role of high-strength concrete in buildings has become more and more important.Due to its high strength,high-strength concrete can reduce the cross-sectional area of components when used in building structures,so that the components are smaller than ordinary concrete components and their weight is reduced,thereby increasing the bearing capacity of the components and ultimately strengthening the building structure The stability.But when taking advantage of its high strength,it must accept its shortcomings of poor brittleness and low ductility.Therefore,in order to solve these problems,many scholars at home and abroad have conducted a lot of research on how to restrain high-strength concrete.This thesis summarizes and analyzes the various restraint methods proposed by domestic and foreign scholars,and proposes a new type of restraint method-expanded steel mesh restraint method.The paper first uses the principle of concrete restraint by stirrups;then designs expanded steel mesh restraint High-strength concrete column components,and load tests on them under axial load;the test data analysis shows that the steel mesh has a good restraint effect on the high-strength concrete;finally,the test results are combined with the finite element simulation and the parameters are expanded Through analysis,the optimal steel mesh thickness for confining high-strength concrete columns is obtained.The main content of the paper is as follows:(1)Six groups of 12 test pieces with a cross-sectional size of 200mm×200mm,a height of 600 mm,and a slenderness ratio of 3 are designed.Among them,3 groups of plain concrete column specimens and 3 groups of reinforced concrete specimens,the steel mesh restraint method is all outsourcing along the surface of the specimen.(2)Axial loading test was carried out on these 6 groups of concrete column specimens,and the failure form,bearing capacity,ductility,energy dissipation,stressstrain and other axial compression properties of each specimen were studied by analyzing the test data.(3)Use ABAQUS finite element analysis software to perform numerical simulation on 6 groups of concrete specimens,compare the simulation results with the test results,and then change the thickness of the expanded steel mesh based on the correct model,and then perform parameter expansion analysis,and finally get The optimal steel mesh thickness for constraining high-strength concrete columns is determined.