Local Buckling Of Steel Plates In Concrete-Filled Square Steel Tube Members With Tie Bars

Tie bars have been frequently used in square or rectangular concrete-filled steel tubular(CFST)columns and concrete-filled steel plate(CFSP)composite shear walls for delaying local buckling of the steel plates and also improving the concrete confinement.A systematic and in-depth study has been carried out on the local buckling behavior of steel plates in concrete-filled steel tube members with tie bars,and following achievements are attained:(1)four specimens with tie bas and two specimens without tie bars were designed and tested under axial compression.In these specimens,only the steel plates resisted the axial load,and the concrete was only used to restrain the inward buckling of the steel plates.The effects of the width-to-thickness ratio of the steel plate and the ratio of the vertical spacing of the tie bars to the steel plate width(abbreviated as vertical-spacing-to-width ratio)were investigated.It was found that the increase in the performance of the steel plates due to the tie-bar restraint was quite limited when the vertical-spacing-to-width ratio was 1/2 and became more significant when this ratio decreased to 1/3.The elastic buckling stresses of rectangular plates were computed using the finite element method for further strength evaluation of the steel plates.It was found that the effect of the columns of tie-bars on the elastic buckling stress increased as the vertical-spacing-to-width ratio decreased and was negligible when this ratio was larger than 0.6.Simplified equations for estimating the maximum strength and reserved strength(defined as the average stress corresponding to the average strain of 3%)of the steel plates in concrete-filled steel tube members with tie bars were developed based on the test results and elastic buckling analyses.(2)The nonlinear finite element analysis method for the steel plates in concrete-filled steel tube members with tie bars under axial compression was proposed.One hundred and five steel plate models were analyzed by the finite element methods.The effects of the yield strength of the steel plate,the ratio of the vertical spacing of the tie bars to the steel plate thickness and the ratio of the steel plate width to the horizontal spacing of the tie bars were investigated,and the entire stress-strain model of steel plates with different tie bars arrangement was developed.