Experimental study on short eccentrically loaded column of recycled aggregate concrete filled square steel tube

Abstract

To investigate the mechanical properties of recycled aggregate concrete filled square steel tubular column under bias voltage, and to analyze the effects of three influencing factors (steel ratio, eccentricity and different types of aggregates) on mechanical properties of test specimens. The experimental results indicated that recycled aggregate concrete filled square steel tubular column had high bearing capacity and excellent deformation performance, and its final fracture morphology was similar to that of common concrete-filled steel tube, which was bending failure. Steel ratio, eccentricity and different types of aggregates had significantly effects on the mechanical properties of bias column. Mid-span longitudinal strain distribution of the test specimens could basically satisfy the plane cross-section assumption, the calculated value according to standard GB 50936-2014 was close to the measured value, which was more suitable for calculating the bearing capacity of bias column.