TORSION PLUS BENDING AND SHEAR ON REINFORCED CONCRETE BEAMS

الملخص

This paper is relevant with reinforced concrete beams subjected to combined torsional moments, bending moments and its comitant shear forces. Six identical beams in its dimensions and reinforcement, but different in the external loading setup were tested. The loading setup was applied in a manner depending on gradual ratio of bending moment to torsional moment; thereby, two beams were references to the other four ones. Experimental results revealed that, the loading setup is considerably effective factor on the structural behavior of the reinforced concrete beam. So that, through the loading setup, the presence of torsional moment leads to enhance the resistance of the beam over than 200% against combined loads than pure bending moment or torsional moment only. Also, the loading setup is capable of restoring the stiffness, maintaining the flexure mode of failure and raising the design safety factor for combined loaded reinforced concrete beams subjected to combined torsional moments, bending moments and shear forces.