Abstract
This paper presents an experimental investigation on the mechanical behaviour of the Self-stressing Steel Slag Aggregate Concrete Filled Steel Tubular (SSSACFST) short columns under axial compression. Ten SSSACFST short columns with different diameter-thickness ratios and expansion rates of Steel Slag Aggregate Concrete (SSAC) are designed, and three different axial compression tests are conducted including the load applied to the core SSAC (type-A loading), load applied to the outer steel tube (type-B loading), and load applied to the steel tube and core SSAC simultaneously (type-C loading). The experimental results show that all SSSACFST short columns subjected to axial load exhibit drum-like failures. The Incremental Range of Load Capacity (IRLC) and the ultimate axial and circumferential strains of the specimens will be improved by increasing the expansion rate. The effect of the loading mode on the ultimate bearing capacity is not very evident, while the influence of the loading mode on the strains is remarkable. The ultimate axial and circumference strains of the specimens with type-B loading mode are significantly larger than those of the specimens with type-A loading mode or type-C loading mode. The increase in the diameter-thickness ratio decreases the ultimate bearing capacity and ultimate axial and circumferential strains of the specimens. According to the experimental results, the adaptability of the existing CFST design codes for estimating the strength of SSSACFST short columns is examined. Additionally, a model for predicting the ultimate bearing capacity of SSSACFST short columns with the type-C loading mode is proposed depending on the limit equilibrium theory. On this basis, the calculation methods of the bearing capacity of the SSSACFST short columns under axial compression with the other two loading modes are suggested. The results predicted by the proposed models are in good agreement with the test data.
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