Influence of steel ratio on axial compressive behavior of recycled aggregate concrete-filled square steel tube short column

Abstract

Abstract: To clarify the improving effect of the steel ratio on mechanical performance and applicability of Code formulas of recycled aggregate concrete-filled square steel tube (RACFST) short column with 100% recycled coarse aggregate replacement ratio, experimental studies were performed. A total of 10 specimens, including both square CFST and RACFST columns, were designed and tested. Based on the experimental results, the influencing mechanism of steel ratio on failure mode, load-displacement behaviour, fracture toughness, ductility and load-carrying capacity was analyzed, and the strength predicting method was discussed. Results show that the increase of steel ratio can effectively improve the mechanical performances of square RACFST, but the improvement is not proportional to the steel ratio. With the lower steel ratio, the prediction results of the code are higher than experimental values and reliability reduces, and the reliability of prediction results, however, tends to stabilise with the increase of steel ratio. When the steel ratio is greater than 9%, the load-carrying capacity evaluation formulas given by the code can be used to predict the axial strength of square RACFST short columns with 100% recycled coarse aggregate replacement ratio.

Key words: recycled aggregate concrete-filled square steel tube, 100% recycled coarse aggregate replacement ratio, steel ratio, load-carrying capability, experimental study

CLC Number:

TU398+.9

ALIFUJIANG Xiamuxi, MAIMAITIAILI Maimaitimin, LIU Cai-jian. Influence of steel ratio on axial compressive behavior of recycled aggregate concrete-filled square steel tube short column[J]. Journal of Lanzhou University of Technology, 2026, 52(1): 120-126.

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