Table 1: Existing theoretical models and guidelines.

No.FormulaReference
Characteristic value of FRP debonding strainDesign value of FRP debonding strain

1 ,
,
[7]

2 ,
,
, ,
[8]

3 , [11]

4 , [12]

5 ( ) ,
, ,
[13]

6 [14]

7 , ,
[1619]
,

8 , ,
,
[20]

9 , , , [21]

10 , ,
[15]
,

is the specified compressive strength of concrete; is the number of plies of FRP reinforcement; is the tensile modulus of elasticity of FRP; is the nominal thickness of one ply of FRP reinforcement; is the ultimate rupture strain of FRP reinforcement; is the design rupture strain of FRP reinforcement; is the FRP strength reduction factor; is the environmental reduction factor; , , , , , , are the partial factors; is the partial factor for concrete; is the characteristic value of specific fracture energy; is the maximum shear bond stress; is the distance from the loaded section to the end of the FRP plate; is the tensile strength of concrete; is the bond-dependent coefficient; , characteristic value of compressive strength of concrete in compliance with Russian codes; strength classes for concrete in compliance with Russian codes.