Experimental study on axial compression mechanical properties of new type concrete-filled square steel tubular columns
A new type concrete-filled square steel tubular column was developed to improve the restraint and overall bearing capacity of core concrete.Taking the shear nails,pull plates and stiffeners as test parameters,the axial compression tests of several specimens were systematically carried out.The test results show that the failure mode of the new type concrete-filled square steel tubular column is flexion,local buckling occurs in the damaged area of the square steel tube,and the concrete finally collapse.By using the finite element software ABAQUS,the numerical analysis models of four new type concrete-filled square steel tubular columns were established,and the bearing capacity of the columns under axial pressure were finely simulated.The analysis results show that the failure mode and load-displacement relationship curve of the column obtained by finite element analysis are in good agreement with the test results.The ultimate bearing capacity expression of the new type concrete-filled square steel tubular column was established,and the accuracy of the theoretical analysis results is good.It can be found from the analysis of relevant influencing parameters that the installation of stiffeners can significantly improve the axial compression capacity of the square steel tubular column,while the installation of pull plates and shear nails does not have a significant effect on its axial compression capacity.
new type concrete-filled square steel tubular columnanxial comperssion testnumerical simulationmechanical behaviorbearing capacity
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