Research Of High-strength Concrete Square Column Constrained By High-strength Spiral Stirrups On Seismic Performance

For most building structures,beams,columns,and slabs are the most basic components.Among them,columns are particularly important.Whether the columns of a structure are safe will directly determine the safety of the entire structure.When conducting research on seismic performance of the structure,it is inevitable to give priority to the seismic performance of the column.For the widely used concrete square columns,the research on the form of rectangular stirrup restraint has a history of nearly100 years.However,with the advancement of science and technology,the altitude of the structure is getting higher and the form is becoming more and more complex,which puts higher and higher requirements on the columns which are one of the cores of the structural bearing system.At present,some scholars have pointed out that the use of spiral stirrups has a better effect than traditional rectangular stirrups,and some scholars have explored their mechanisms.However,these investigations are based on the premise that the strength of steel bars and concrete strength are low.The improvement of strength is an inevitable trend.Therefore,the research on high-strength concrete columns constrained by high-strength stirrups has great prospects.This article is an experimental and simulation study of high-strength concrete columns constrained by high-strength spiral stirrups.The main research contents are as follows:(1)In this paper,6 full-strength high-strength concrete square columns equipped with high-strength spiral stirrups are made for pseudo-static test.The control variables of the 6 square columns are the spacing of the spiral stirrups,the strength of the spiral stirrups,the axial compression ratio of the specimen,and the constrained form of stirrups.Through the description and analysis of each experimental test phenomenon,qualitatively explore the influence of each control variable on the destruction form of the test pieces.(2)By processing the test data of 6 test pieces,we draw the hysteresis curve,skeleton curve and stiffness degradation curve of each test piece,and calculate the respective ductility performance coefficient and energy dissipation performance coefficient based on these curves.After co MParative analysis of the results of each test piece,quantitatively analyze the influence of the four parameters of the spacing of the spiral stirrups,the strength of the spiral stirrups,the axial compression ratio of the specimen and the constraint form of the stirrups on the seismic performance of the concrete column.(3)By using Abaqus finite element software,we simulate and analyze the test specimens,and co MPare the simulation results with the test results to verify the accuracy of the model.Based on the results of the verification,the finite element software is used to further expand the parameters to analyze the influence of stirrup strength(divided into spiral stirrups and external stirrups),longitudinal reinforcement strength and concrete strength on the seismic performance of concrete square columns.