Abstract
The aim of this study is to evaluate the shear strengthening of fire-damaged reinforced concrete (RC) beams with carbon fiber-reinforced polymer (CFRP) laminates using the near-surface mounted (NSM) technique. An experimental program involving 13 RC beams subjected to heating for 60, 90, and 120 min in accordance with the standard fire curve presented in International Organization Standardization (ISO) 834 is presented. After cooling to room temperature, the beams are strengthened with NSM CFRP laminates at spacings of 75, 150, and 200 mm. During heating, explosive spalling of concrete occurred in the samples. The NSM CFRP system can efficiently strengthen the shear of the beams; in most cases, it recovers the initial shear capacity of fire-damaged RC beams and increases it considerably. A smaller spacing between the laminates results in greater load capacities and stiffness, and a spacing of 75 mm causes the RC beams to fail owing to peeling-out in the strengthening region.
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