Static load tests for reinforced concrete deep beams strengthened with carbon fiber sheets and plates were carried out to investigate the structural behavior and the strengthening effect of carbon fiber on the R/C deep beams. Test results show that the crushing of compression strut for the unstrengthened specimen is changed to the group of several diagonal cracks at mid-depth within the shear span of strengthened specimen. Consequently, it is appropriate to strengthen the R/C deep beam with carbon fibers in perpendicular to the expected fracture mode, which obtained by the nonlinear structural analysis, which cause the improvement of ultimate fracture load.
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