Abstract

For the problem of square concrete-filled steel tube (CFST) under the action of axial pressure, concrete received local compression and buckling occurred in the application of thin-walled steel pipe.Using built-in spiral reinforcement to strengthen the constraints of thin-walled square steel tube to core concrete. And by using ANSYS program established the built-in spiral reinforcement of thin-walled square steel tube concrete composite column 3 d finite element model, and the results show that spiral reinforcement strengthen the constraint effect, increase the ultimate bearing capacity of the composite columns of square steel tube by 7.41%; And with stiffening rib and rod measures were compared, built-in spiral ripe construction is convenient, easily applied.

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