Finite Element Modeling of the Bond-Slip Behavior of CFRP Anchors
Jose Luis Jimenez and Hernan Santa Maria
Appears on pages(s):
bond-slip law, CFRP anchors, push-pull tests, single-lap, 2D FEM
CFRP reinforcement has become a consolidated technology in the retrofit of existing structures. Extensive experiments have shown that delamination of externally bonded CFRP plies governs their failure mode. To delay delamination, CFRP anchors are particularly attractive due to their wide range of applicability and large increases in strength and deformability. This paper presents a 2D finite element model for single-lap push-pull tests of concrete blocks reinforced with CFRP subject to monotonic loading. A numerical model is implemented to simulate the bond between CFRP anchors and concrete. CFRP anchors present a complex geometry and a combined tensional state of tangential and normal stresses. For these reasons it is difficult to determine a bond-slip law for CFRP anchors; however, with the proposed procedure the necessary parameters are obtained numerically, at a low computational cost. Experiments taken from literature with a single CFRP anchor are replicated and used to capture the parameters of the bond-slip curve for a particular anchor. The procedure is then validated with experiments with two and three anchors. The proposed procedure achieves reasonable results when comparing the obtained maximum strength achieved, the strains along with the CFRP reinforcement, and the anchor stress behavior with the experiments.