Simplified models for simulating FRP-to-concrete interface behavior are introduced and empirical relationships are utilized for their calibration. Moreover, the results of pull-out tests on FRP-to-concrete joints are presented. They are utilized in calibrating a bilinear shear-stress-to-interface-slip relationship by means of an inverse identification procedure.
Ciro Faella , Enzo Martinelli, and Emidio Nigro, "Interface Behaviour in FRP Plates Bonded to Concrete: Experimental Tests and Theoretical Analyses" in "Advanced Materials for Construction of Bridges, Buildings, and Other Structures III", Eds, ECI Symposium Series, Volume P05 (2003). http://dc.engconfintl.org/advanced_materials/3