In
this paper, the peeling behavior and the spalling resistance effect of fiber
reinforced polymer (FRP) sheets
externally bonded to bent concrete surface are
firstly investigated theoretically. A peeling load is applied on the FRP sheet
by loading a circular rod placed into the central notch of beam, and the
theoretical analysis is conducted for the specimens. Load is expressed as the
function of peel angle by geometry analysis and equilibrium of forces between
FRP sheets and circular rod.
Interfacial fracture energy is calculated
analytically using membrane peeling method. Both initial loading and debonding
propagation stages are explored. It is realized that only two material
parameters, the interfacial fracture energy of FRP-concrete interface and the
tensile stiffness of FRP sheets, are necessary to represent the interfacial
spalling behavior. Finally, the peeling load – deflection curves for various
radii of curvature of concrete surface are demonstrated by means of a numerical
example. It is found that radius of curvature has remarkable influence on peeling
load.