Test And Analysis Of The Axial Compression Performance Of Section Steel Reactive Powder Concrete Short Columns

Steel-reinforced concrete composite structure is a kind of composite structure with excellent mechanical properties,which has been widely used in practical construction engineering.This composite structure mainly uses the section steel as the skeleton and casts concrete around the section steel.This composite structure has the advantages of high bearing capacity,good seismic performance and simple construction.Based on the reinforced steel concrete composite structure,reactive powder concrete is used instead of ordinary concrete to form the reinforced steel reactive powder concrete composite structure.This composite structure can fully combine the advantages of both shaped steel and reactive powder concrete,and has the advantages of reducing the cross section area and improving the bearing capacity.It can be used in large-span,super-tall building and nuclear power plant engineering.Column is an indispensable component in building structure.This paper studies the section steel reactive powder concrete short column.In this paper,the axial compression test,finite element analysis and theoretical study of section steel reactive powder concrete short column are carried out.Firstly,the axial compression test was carried out on four sections of reactive powder concrete short columns,and the whole test process was recorded.The influence of reinforcement ratio,steel ratio and volume stirrup ratio on the axial compression capacity of the sections of reactive powder concrete short columns was studied,and the influence of these three factors on the loaddisplacement curve was also analyzed.On the basis of the test,the ABAQUS finite element analysis software is used to simulate the axial compression of four sections of steel reactive powder concrete short columns,and the finite element analysis results are compared with the actual results,so as to prove the feasibility of finite element analysis.In order to fully study the factors affecting the axial compressive capacity of the reinforced steel reactive powder concrete short column,the ABAQUS finite element software was used to establish a specimen model,and the combined structure was further studied.Finally,the applicability of the two calculation methods to the calculation of axial compression capacity of section steel reactive powder concrete short columns is analyzed.The final research results of this paper are as follows:（1）Under the vertical axial force,the surface of the column body does not change significantly at first,and small concrete blocks fall off with the increase of the axial force.When the peak load is reached,the column breaks suddenly,and cracks appear throughout the column body,and the peak load drops suddenly,showing brittle failure.（2）By pasting strain gauges on the column surface,longitudinal bars and section steel,and placing displacement gauges in the middle of the column,the load-strain curve is drawn.It was found that the strain of stirrup,longitudinal reinforcement and section steel had yielded before reaching the peak load.The results show that the longitudinal bars and section steel play their role and bear part of the axial pressure.The axial pressure of the column increases with the increase of reinforcement ratio,volume stirrup ratio and steel ratio.（3）The ABAQUS software was used to simulate and analyze the steel active powder concrete short column,and the finite element simulation data were obtained to compare the peak loads and draw the load-strain curve,which was compared with the test results to verify the reliability of the model established in this paper.ABAQUS software was used to analyze the parameters,and it was found that increasing the strength of reactive powder concrete,longitudinal reinforcement and section steel,and increasing the reinforcement ratio,steel ratio and volume stirrup ratio could effectively improve the axial bearing capacity of the section reactive powder concrete short column.（4）In this paper,two methods are used to calculate the axial compression capacity of the section active powder concrete short column.The experimental results are compared with the calculated results.The comparison results show that the calculation formula considering the stirrup constraint is suitable for the calculation of the axial compression capacity of the section active powder concrete short column proposed in this paper.In order to further verify the rationality of the calculation formula for the bearing capacity of stirrups,the axial bearing capacity of composite columns simulated by finite element was compared with the calculation result of the formula,and the error of the comparison result was small.