Abstract
Fifty-four bond specimens were subjected to cyclic bond tests to obtain the bond stress–slip relationships between the fiber reinforced polymer (FRP) sheets and concrete. The specimens were prepared in accordance with Japan Concrete Institute recommendations (in 1998). The tests were conducted using three experimental variables: (1) type of FRP (aramid, carbon, and polyacetal); (2) sheet layers (single layered and double layered); and (3) loading hysteresis. The bond stress–slip model was developed on a Popovics base envelope and consisted of seven empirical parameters: The maximum bond stress τmax, the corresponding slip smax, the curve characteristic constant a, the unloading stiffness K, the ultimate slip su, the friction stress τfp, and negative friction stress τfn. Numerical analyses using the model compared well overall to the experimental cyclic responses of the specimens.
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