The present study is an experimental investigation of the behavior of two-way simply
supported RC flat slabs with centered circular, rectangular, and square openings. Four models
were tested to failure, consisting of a reference model without opening, and three models with
an opening and Carbon Fiber Reinforced Polymer (CFRP) laminates applied to the tension
face of the models. The results revealed that externally bonded CFRP laminates significantly
increased both the overall stiffness and flexural capacity of the models provided with an
opening. CFRP anchoring method can further increase the performance of the strengthening
scheme used. Experimental load-deflection curves and failure modes are discussed.