科研之友
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摘要
By setting stiffening belts, the lateral stiffness of the steel tube of square section CFST columns is effectively improved, the resistance capacity of the local buckling of the steel tube is enhanced, and then the bearing capacity and the ductility of the columns are improved.The axial compression experiments of the ordinary square section and the stiffened square section CFST short columns were carried out.The characteristics of the failure, deformation, bearing capacity, strain of the steel tube of the columns were analyzed.The experimental results show that by setting the stiffening belts the confinement effects of the steel tube to core concrete become stronger and more uniform and the local buckling mode of the steel tube are changed.The axial compression bearing capacity and deformation capacity of the columns are significantly increased.The calculating method is put forward for the axial compression bearing capacity according to the mechanical analysis of the stiffened section square CFST short columns.The calculating results are in good agreement with the experimental results.
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