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There is a growing trend in constructing high-rise buildings towards eliminating the extra space above false ceilings by passing service ducts through openings in the floor beams. Such an arrangement of building services leads to a significant reduction in the dead space, and results in a more compact and economical design. However, including openings in the web of a reinforced concrete beam induces high stress concentration at opening corners, reduces beam stiffness, and alters the simple beam behavior to a more complex one. Therefore, this work investigates the effect of openings on the statical behavior of high strength L- section reinforced concrete beams. For this purpose, thirteen reinforced concrete beams of L- section, with web openings, were tested. The studied parameters were: opening position, concrete compressive strength, length of the opening, reinforcement around the opening, and shape of the opening (rectangular, square, and circle). Cracking and ultimate loads were recorded; deflections at the position of mid- span and at the center of the opening were measured. Pattern of cracks and modes of failure were observed It was found that, decreasing the compressive strength of the used concrete, or the steel reinforcement around the opening, and increasing the opening length have a great effect on cracking and ultimate loads, pattern of cracks, and maximum induced deflections and strains, i.e., bearing capacity, and deformation capacity of such tested beams.

EFFECT OF OPENINGS ON THE STATICAL BEHAVIOUR OF REINFORCED HIGH STRENGTH CONCRETE L- BEAMS