ABSTRACT
According to Nakaba et al.’s study (2001), the shearslip response relationship (Fig. 1) can be expressed by the following power law:
Where n = 3 for concrete with a compressive strength range over 24-58 MPa. s0 = relative slip between the concrete and the FRP corresponding to maximum bond stress, τmax = maximum shear stress. Substituting n = 3, the expression for the shear-slip response in Equation 1 becomes:
The area beneath the curve (Fig. 1) is equal to the value of the interfacial fracture energy Gf :
The ratio of the maximum shear, τmax, over the corresponding slip, s0, depends upon the properties of the concrete-adhesive-composite material system and is independent of the slip variation ds. Thus, this integration, Equation 3 becomes Equation 4:
Assuming that the maximum shear stress, τmax, and the corresponding slip, s0, have linearly increasing relationships and the ratio of τmax over s0 is related to the material system properties.
