1. Experimental study on shear behavior of reinforced concrete beams strengthened with CFRP sheet after fire.
- Author
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XU Yuye, PENG Xiaoli, DONG Yuli, LUO Yi, and LIN Bilan
- Abstract
Based on the static load tests of two reinforced concrete (RC) beams without fire, two RC beams after fire and four RC beams strengthened with CFRP sheet after fire, the effects of shear span ratio, CFRP sheet usage and flange on the strengthening shear behavior of RC beams after fire were analyzed. Using a self-developed finite element program, the average reduction coefficient of concrete tensile strength of beam section after fire and repaired with equal dimensions was calculated, and a practical calculation method for shear strength of RC beams strengthened with CFRP sheet after fire was proposed. The results show that rupture failure occurs in fully-wrapped CFRP sheet and debonding failure occurs in the U-wrapped CFRP sheet with additional anchoring. The shear strength of concrete rectangular beams firstly exposed to fire and then fully-wrapped with CFRP sheet is higher than, about 5. 3% -16. 6%, that of the unfired one. The shear strength of concrete T-shaped beams firstly exposed to fire and then U-wrapped CFRP sheet with additional anchoring is increased about 34. 0% compared with that of the corresponding unfired rectangular beam. The proposed formula for the shear strength of RC beams strengthened with CFRP sheet after fire has certain safety margin ratio, and can be used to calculate the strengthened shear performance of that member after fire. [ABSTRACT FROM AUTHOR]
- Published
- 2015
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