Structural behavior of self compacting concrete deep beams reinforced with longitudinal circular openings

Reinforced concrete deep beams are commonly used in high-rise buildings to support heavy loads. Openings are typically given in deep beam construction for accessibility and to permit essential services such as power, ventilation, and network system access. However, deep beams’ openings can generate various beam behaviour problems, including reduced beam strength, excessive cracking, and deflection. This investigation conducted the behaviour of longitudinal circular opening-reinforced self-compacting concrete deep beams. The behaviour of six specimens have been studied in this research; different longitudinal circular sizes openings (circular opening in the tension zone with a diameter of (4in, 3in, 2in, in addition to the ratio of the void) were utilized in this study, all specimen have the same dimensions ((1600)mm length, (425)mm total height, and (250mm) width), For comparison purposes, one of these specimens was cast with a solid section (without longitudinal opening). The study’s primary consideration is longitudinal openings, size of openings, voiding ratio and openings reinforcement. The crack pattern, deflection, and load capacity were measured and discussed. The experimental program reveals that longitudinal openings reduce the loading capacity of SCC reinforced concrete deep beams; increasing the opening size also lowers the capacity load. The small circular opening’s structural behaviour approximated that of the reference specimen. The use of steel pipes to strengthen the longitudinal opening was found to be a practical specimen in increasing deep beam stiffness and load carrying capacity; the ultimate load was enhanced by (12.33) per cent over an unreinforced opening beam.