Abstract
This paper presents both experimental and analytical study results for predicting the flexural capacity of reinforced concrete (RC) beams with externally bonded carbon fabric reinforced cementitious matrix (carbon-FRCM). Firstly, the available prediction approaches for FRCM-strengthened RC in flexure were summarized. The prediction formulas were deficient in the fabric slippage failure. Nine carbon-FRCM specimens with different layers of carbon fabric (CF) were tested under uniaxial tensile loading. Four RC beams were strengthened in flexure with carbon-FRCM having different layers of CF, which were tested under four-point bending. From the tensile test results, the apparent strain of CF was derived from the global strain of carbon-FRCM, and the two-layer carbon-FRCM was an optimized selection in the design of multilayer carbon-FRCM. From the bending test results, the utilization efficiency of CF was slightly higher in the fabric slippage failure than that in the peeling-off of concrete cover, and the failure mode was differentiated as the layers of CF increased. Additionally, a new procedure of prediction formulas in flexure for carbon-FRCM-strengthened beams was proposed, using the apparent strain of CF to assess the strengthening performance of beams at different load-carrying scenarios. The prediction of the proposed formulas agreed well with the experimental results.
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