Abstract

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Title:: Analysis of Load Carrying Capacity of Concrete-filled Square CFRP-steel Tubular Stub Column Under Axial Compression

Author(s):: ZHAO Jun-hai; DU Wen-chao; ZHANG Chang-guang; School of Civil Engineering, Chang’an University

Keywords:: unified strength theory; CFRP; concrete-filled square steel tubular; stub column under axial compression; ultimate bearing capacity

Abstract:: Based on the unified strength theory, the load carrying capacities of concrete-filled square CFRP-steel tubular stub column under axial compression were analyzed. The concretefilled square CFRP-steel tube was equivalent to concretefilled circular CFRP-steel tube through introducing equivalent stress factor, concrete strength reduction factor and equivalent constraint reduction factor. Then authors established a formula for calculating ultimate bearing capacity of concrete-filled square CFRP-steel tubular stub column under axial compression. Through comparing the results of proposed formula with those of reference data, the correctness of proposed formula was proved. The influencing factors of formula were also discussed. The results show that the ultimate bearing capacity of concrete-filled square CFRP-steel tubular stub column under axial compression increases with increasing the tension and compression ratio of material, unified strength theory parameter and thickness of CFRP. However, the confinement rate of CFRP decreases with increasing its thickness. The obtained results can provide some theoretical references for the design, construction and extension of concretefilled square CFRP-steel tubular stub column under axial compression.