To increase the axial compression performance of thin-walled concrete-filled steel tubular col-umns,the prestressed thin-walled circular steel tubular confined concrete column was presented,in which the tension bolts were used to apply circumferential prestressed force for thin-walled circular steel tube to form initial confining pressure on the internal concrete,and then the axial compressive strength and bearing capacity per-formance of internal concrete were improved.To investigate the improvement effect of the axial compression per-formance,the short column axial compression test was first conducted,and then a nonlinear finite element mod-el was established with Abaqus software.The reliability of the model was verified based on the load displace-ment data obtained from the experiment.Based on the validated model,the parameter analysis was carried out for the prestressed thin-walled circular steel tubular confined concrete short column with different prestressed de-grees(k=0,0.1,0.2,0.3,0.4 and 0.5)and different steel tube thicknesses(t=1.5mm,2.0mm,2.5mm and 3.0mm).The results show that applying circumferential prestressed force to thin-walled circular steel tube concrete columns using tension bolts can effectively improve their axial compressive strength,stiffness,and duc-tility.Within the appropriate range of prestressed force(k=0～0.4),the improvement in the axial compression performance of prestressed thin-walled steel confined concrete short columns increases with the prestressed de-gree increase.A larger prestressed degree(k=0.5)will cause to significantly decrease of structural element bearing capacity after reaching its peak load,thereby reducing the ductility of the structural element.When the prestressed degree k remains constant,the axial compression performance of the structural element increases with the steel pipe thickness increase.
PrestressedThin-walled circular steel tubular concrete short columnFinite elementAxial compression performance
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