Experimental Study on a New Clamping Anchor for Carbon Fiber Reinforced Polymer Plate

To address the problem of uneven transverse compressive stress distribution in traditional carbon fiber reinforced polymer (CFRP) plate anchors, which makes the plate prone to tearing failure during the tensioning process, a new clamping anchor for CFRP plates was developed. The new anchor features a preloaded bolt arranged along the central axis. By setting the bolt length and controlling its displacement, a quantified compressive force was applied to the CFRP plate, and the force mechanism of the new anchor was analyzed. Next, finite element software ANSYS was used for simulation, and the key factors affecting anchorage performance were analyzed. Finally, a static tensile test was performed on a CFRP plate with a thickness of 2 mm and a width of 50 mm. The results are as follows. 1) The anchorage performance of the new anchor is closely related to the clamp thickness, the outer clamp plate thicknesses, and the bolt preload force. When the clamp thickness is 20 mm, the transverse compressive stress distribution of the CFRP plate is relatively uniform, with a difference between the maximum and minimum compressive stresses of only 9.8 MPa. When the thicknesses of the upper and lower outer clamp plates are 30 mm and 20 mm, respectively, the bending stress of each component remains within a safe range. When the preload force of the bolt is 170 kN, the compressive stress level in the CFRP plate significantly increases, while the shear stress remains consistently low. 2) In the static tensile test, the new anchor withstands a maximum tensile force of 260.7 kN, achieving an anchoring efficiency of 108.63%. The failure mode of the CFRP plate is fiber rupture, with no tearing or other abnormal failure modes observed. The anchor demonstrates excellent static anchorage performance.