The setting of pair bolts can improve the mechanical properties of concrete filled steel tubular short columns.The ANSYS model with the same parameters of the specimen was used as the original example to study the influence of the diameter and longitudinal spacing of the pair bolts,the hoop coefficient,the width-to-thickness ratio,the length-to-width ratio and the material strength on the axial compression mechanical properties.The results show that the constraint effect of the steel tube on the core concrete can be improved by setting the pair bolt.The stress distribution of the core concrete is characterized by the formation of two effective constraint zones with the pair bolt as the dividing line,and the stress value of the four corners is the largest.With the decrease of the longitudinal spacing of the pair bolts and the increase of the diameter,the bearing capacity,deformation capacity and ductility of the specimens are improved.The bearing capacity of the specimen can be increased slightly with the increase of the hoop coefficient,the decrease of the width-thickness ratio and the increase of the material strength.The calculation method of axial bearing capacity of rectangular concrete filled steel tubular short column with pair bolts was proposed.The calculated values are in good agreement with the experimental values.This method is also suitable for the calculation of bearing capacity of rectangular concrete filled steel tubular short column with binding bars,and calculation process is simple and accurate.
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