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In this paper, the strengthening of two-way slabs using CFRP sheets is evaluated experimentally. The reinforcement ratio equal to 1.29% was chosen to serve the purpose of demarcating the punching shear failure mode. Results show that the punching capacity of two-way slabs can increase to 40% over that of the reference specimen. However, since bridge deck slabs directly sustain repeated moving wheel loads, they are one of the most bridge elements susceptible to fatigue failure. Therefore, this research is designed to investigate the fatigue behavior and fatigue life of concrete bridge deck slabs strengthened externally with CFRP sheets. A total of five slabs were constructed and tested under concentrated monotonic and cyclic loading until failure. Results are presented in terms of deflections, and strains in steel and CFRP at different levels of cyclic loading. The results showed the longer fatigue life of concrete bridge deck slabs strengthened CFRP sheets.

FATIGUE BEHAVIOR OF RC SLABS STRENGTHENED EXTERNALLY WITH CFRP SHEETS