ABAQUS 1 Bearing capacity 1 Bending-torsion 1 Bending-torsion performance 1 CFRP 1 Carbon fiber polymer 1 Carbon fibers 1 Concrete-filled 1 Concretes 1 Experimental study 1 Filled polymers 1 Finite element analyse 1 Finite element method 1 Loads (forces) 1 Performance 1 Polymer steels 1 Reliability analysis 1 Software testing 1 Square concrete-filled steel tube 1 Steel fibers 1 Torsion loads 1 Torsional stress 1 Tubular steel structures bending-torsion performance 1 experimental study 1 finite element analysis 1 square concrete-filled steel tube 1