Calculation of shear capcaity is very little considered about debonding destruction.

Experimental study on debonding failure of steel beams strengthened with a CFRP plate;

Experimental investigation on flexural and flexural/shear crack induced debonding failure in FRP strengthened concrete beams;

Study on Flexural Behavior and Debonding Failure of CFRP-strengthened RC Beams;

Trough the application of finite element software ABAQUS, FRP reinforced concrete beams, FRP reinforcement FRP sheets and FRP reinforcement AL plates are respectively studied to identify the location and size of debonding failure layer by the analysis the change law of strain curve of fiber-optic, providing the theoretical basis of this method for practical engineering applications.

Based on different stress state at the cracking position and experimental results,an interface failure criterion was proposed.

The mechanism of the interface failure,as is reported in this paper, has been studied by the pull-out test, SEM, surf ace energy and fracture energy measurements.

Using the analytical methods of composite mechanics for reference, this paper established a layering shear-lag model accounting for the interfacial failure in mid-span and incorporated an energy failure criterion to study the stress redistributions and failure loads of carbon fiber sheet-reinforced concrete and reinforced concrete beams with a crack under 4-point bending.

By adopting a new anchoring method, interfacial failure happened between CFRP sheets and concrete, the effective jointing length between Sika~ CarboDur~ CFRP sheets and concrete is about 200 mm, and the interfacial bonding shear strength reached 20～30 MPa.