Crack Resistant Performance and Crack Width of one-Way Slabs Strengthened with FRP

Abstract

Based on the tests of six reinforced concrete slabs strengthened with fibre reinforced plastic (FRP) sheets and one reference slab without the sheet, the influences of factors such as type of FRP sheets (CFRP and GFRP), amount of FRP sheets and strengthening scheme upon the crack resistant performance were presented and discussed in this paper. In the end, a calculation method was put forward, which can be used to calculate cracking moment and crack width in reinforced concrete slabs strengthened with FRP sheets.

Experimental and Theoretical Analysis of Cracking Moment of Concrete Beams Reinforced with Hybrid Fiber Reinforced Polymer and Steel Rebars

“…That fact has proven that both GFRP and steel reinforcement affects the cracking moment of hybrid GFRP/steel RC beams, but the contribution of GFRP reinforcement in this stage is negligible as compared to steel, and the stress in GFRP is about 0.44% to 0.73% of ultimate tensile strength. These results are consistent with the findings reported by most other researchers [27][28]31] and are contrary to the results presented in [32]. In addition, experimental research results show that, as the first crack appears, the maximum tensile strain in the outermost concrete fiber ( , ) reaches the value of 1.47×10 -4 to 1.86×10 -4 , which meets the recommended ultimate tensile strain of concrete = 1.5×10 -4 in SP 63.13330:2018 [33].…”

“…6. It is well known that the cracking moment depends on beam dimensions, properties of materials, and reinforcement ratios [28,30]. It can be seen in Figs.…”

“…Gao et al [28] carried out an experimental study on the flexural behavior of one-way slab strengthened by FRP sheets, and pointed out the influence of the amount of strengthening CFRP and GFRP sheets on cracking moment of RC one-way slab. In particular, the CFRP sheet with a high elastic modulus has a stronger effect on the cracking moment in comparison with a GFRP sheet.…”