EXPERIMENTAL MEASUREMENTS AND NUMERICAL SIMUATION OF NOVEL ANCHORING DEVICES FOR OPEN HOOP FIBER REINFORCING POLYMER STRIPS USED IN THE SHEAR UPGRADE OF R/C T-BEAMS

Abstract eng:
Shear strengthening of reinforced concrete (R/C) T-Beams can be achieved by open hoop FRP strips applied externally as transverse reinforcement. Unless these FRP strips are anchored the transfer of tensile forces developing in these strips relies solely on the interface between the FRP sheet and the concrete contact surface. In this case, the delamination (debonding) mode of failure of these FRP strips is very likely to occur, disrupting the effectiveness of such a shear strengthening scheme. Consequently, there is need to study both this debonding mode of failure as well as various forms of effective anchoring. For this purpose a number of special unit T-Beam R/C specimens were fabricated employing open hoop FRP strips with or without anchoring. One type of anchoring that was tested is based on a novel anchoring device. It was demonstrated that an anchoring scheme devised by the authors can provide the necessary satisfactory transfer of forces between the FRP strip and the concrete volume of the R/C T-Beam. This used testing arrangement was also numerically simulated employing the exact properties of the materials which were used in the experimental sequence. Two different types of numerical models were studied. The first was without any anchoring device whereas the second the novel anchoring device that was employed during testing was simulated in detail. It can be demonstrated that the used numerical simulation predicts in a satisfactory way both the bearing capacity as well as the mode of failure that was observed in the test specimens with or without the anchoring device.

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