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HOLLOW SECTIONS HAVE BEEN INCREASINGLY APPLIED IN THE CONSTRUCTION OF BUILDINGS, BRIDGES, OFFSHORE STRUCTURES, AND TOWERS FOR PASSING ELECTRICAL AND MECHANICAL PIPES OR OTHER UTILITIES. ONE OF THE WEAKNESSES OF HOLLOW SECTIONS IS UNDER TORSION FORCE CAUSED BY EXTERNAL FORCE WHICH IS RARELY INVESTIGATED. IN PARTICULAR, THE BEHAVIOR OF HOLLOW SECTIONS WITH HIGH-STRENGTH CONCRETE (HSC) AND ULTRA-HIGH PERFORMANCE CONCRETE (UHPC) REMAINS POORLY STUDIED. THIS STUDY AIMS TO EXAMINE THE BEHAVIOR OF A REINFORCED CONCRETE HOLLOW BEAM WITH OPENING AND COMPARE IT WITH A HOLLOW BEAM WITHOUT OPENING. THE HOLLOW BEAM WITH AN OPENING IS MODELED USING THE FINITE ELEMENT METHOD AND ANALYZED UNDER TORSION, FLEXURAL, AND CYCLIC LOADING FOR TWO DIFFERENT HSC AND UHPC MATERIALS. THE EFFECT OF THE OPENING SECTION SIZE ON THE BEHAVIOR OF HOLLOW BEAM IS ALSO EVALUATED. RESULTS SHOWED THAT THE OPENINGS CREATED IN THE WEB OF HOLLOW BEAMS LED TO A DECREASE IN THE CAPACITY OF THE BEAMS ALTHOUGH THE HOLLOW BEAM WITH SMALL OPENING CAN CARRY ALMOST THE SAME LOAD AS THAT OF HOLLOW BEAM WITHOUT AN OPENING. THE RESULT ALSO INDICATED THAT THE CAPACITY OF UHPC BEAMS FOR TWISTING IS TWICE THAT OF HSC BEAMS.

Effect of an Opening on Reinforced Concrete Hollow Beam Web Under Torsional, Flexural, and Cyclic Loadings