Simulation of Crack Growth in FRP Reinforced Concrete对照翻译.docVIP

Simulation of Crack Growth in FRP Reinforced Concrete Yunyi Zou, Ph.D., P.E.1; and Arthur Huckelbridge, P.E.2 Abstract: Experimental results show that the crack growth of fiber-reinforced polymer (FRP) reinforced concrete flexural elements experience a crack development stage followed by crack stabilization. The crack length and elastic crack mouth opening displacement (CMOD) increase during the crack development stage until reaching the crack stabilization stage. A finite-element representation was proposed to predict the initial CMOD. A debonded length was specified to account for the bond-slip between FRP bar and concrete. It was assumed that there was no tangential displacement between the reinforcement and concrete outside of the debonded length. A fatigue model was created using the Paris equation to simulate the growth of elastic CMOD. The model displayed good agreement with the test results. A size effect was also observed for the exponential parameter in the Paris equation. DOI: 10.1061/(ASCE)1084-0702(2007)12:2(237) CE Database subject headings: Fiber reinforced polymers; Cracking; Fatigue; Concrete, reinforced. Introduction Fiber-reinforced polymer (FRP) reinforcement has been known for its high ratio of strength to mass, excellent fatigue characteristics, excellent corrosion resistance, electromagnetic neutrality, and low axial coefficient of thermal expansion. There is significant potential for applying FRP RC in bridge engineering for structural elements in corrosive environments with low ductility demand. Due to the high strength of FRP, serviceability becomes a critical issue. The main serviceability requirements are maximum deflection and crack width control. For quasi-brittle materials such as concrete, there exists an inelastic zone at the tip of a crack, which is called the fracture process zone. Shah (1995) s