The main purpose of this study is to evaluate the effect of CFRP strips on the behavior of circular RC slabs which have different shapes of openings (circle, square, and rectangle). Eight circular RC slabs were constructed and tested under repeated loading. The experimental variables considered in this paper include the shape of openings and the form of strengthening. All the slabs were geometrically similar, having dimensions of (1200mm in diameter and 75mm in thickness). Two different strengthening schemes were used in this paper. The slab specimens were divided into three groups: group I includes three unstrengthened control slabs with central openings, group II includes three specimens having central openings and strengthened with CFRP strips using scheme I, and group III includes two specimens having central openings and strengthened with CFRP strips using scheme II. The test results clearly demonstrated that using CFRP leads to significant improvement in the flexural capacity of circular RC slabs.
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