ENDURANCE LIMIT OF FRP COMPOSITES USED FOR REINFORCEMENT OF CONCRETE STRUCTURES

Abstract eng:
FRP reinforcement subjected to a constant load over time can suddenly fail after a time period called the endurance time. This phenomenon is known as creep rupture. Carbon fibers have a very good resistance to creep rupture. Aramid fibers are more susceptible to this phenomenon and glass and basalt fibers are the most susceptible ones. Results of various previous experimental programs showed the ratios of stress level at creep rupture to the initial strength to be in range of 0.18 to 0.93 for different types of FRP reinforcement. Simple example was chosen to calculate supposed stresses in reinforcement and according to results, only calculated values for CFRP reinforcement are lower than the 50-years residual stresses according to aforementioned experiments. The values of residual stresses are only extrapolated from shortterm tests and real experience in time is needed to decide about real long-term degradation of these materials.

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