Residual Strength of Steel-Reinforced Concrete-Filled Square Steel Tubular (SRCFST) Stub Columns After Exposure to ISO-834 Standard Fire

다국어 초록 (Multilingual Abstract)

Steel-reinforced concrete-fi lled square steel tubular (SRCFST) column has been acknowledged as a progressive form from the steel–concrete composite system, having a higher load-bearing capacity. Aiming at lying the foundations for SRCFST full-scale research after fi re exposure, this paper has studied the axial compression behavior of SRCFST stub columns after diff erent modes of fi re exposure. To start with, temperature distributions, failure patterns and load–strain relationships of four existing SRCFST columns were experimentally analyzed. Based on this, numerical models of square SRCFST columns with suffi cient correctness and eff ectiveness were established for further holistically examining impacts of fi re duration time, yield strength of steel tube, compressive strength of concrete, confi nement index, section steel index and sectional dimensions on residual strength of SRCFST columns. The results indicate that residual strength of square SRCFST columns decrease signifi cantly with fi re duration time, sectional dimensions and section steel index, while yield strength of steel, compressive strength of concrete and confi nement index exert negligible eff ects. Afterwards, predictive formulas that can calculate residual strength index of square SRCFST columns under diff erent patterns of fi re exposure were proposed.

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