Strength of Concrete Subjected to Pullout Load

Site-bond modelling of porous quasi-brittle media

“…We have selected plain concrete as a study material. Typical values for the macroscopic elastic and failure properties of this material are: compressive strength f c = 40 MPa; tensile strength f t = 3.3 MPa; modulus of elasticity E = 5000Hf c = 31623 MPa; Poisson's ratio n = 0.25 (Bortolotti, 2003). The linear elastic behaviour of this material is represented by a site-bond model with the following bond properties: R 1 /L = 0.1; R 2 /L = 0.35; G b /E b = 0.61; and E b = 66292 MPa.…”

A post-installed insert for pull-out tests on concrete up to 70 MPa

“…Several authors and codes relate the splitting tensile strength of concrete to the compressive strength by means of a power law [30][31][32][33][34][35], while other authors [36] and [37] suggested a different nonlinear connection. Even though we can note that the splitting tensile strength is conceptually not the same as the direct tensile strength, that is the parameter to be considered in the MohrCoulomb type limit domain, we can say that both the assumptions are reasonable due to the large scattering of measured data in tensile tests; besides, the equations provided in [30][31][32][33][34][35][36][37] give substantially the same results. For the aims of this paper, we'll assume the equation suggested in [37]:…”

“…12b and c. It is in this case that the transversal field plays the major role: transversal compression increases the interlocking of the aggregates across the crack surface while traction reduces it. Since the bridging effect of aggregates rules the pre-peak phase and the peak value of the pull-out force [21] and [22], we can assume that the effect of the transversal stress field can be represented by an increase of the uniaxial tensile strength, as already conjectured, on similar bases by [36], which asks another model parameter c to be introduced:…”