The Model Test on the Anchoring Performance of GFRP Anti-Floating Anchor with Base Floor

Abstract

In order to solve the external anchorage problem of GFRP (glass fiber reinforced plastics) anti-floating anchors, a new anchorage system–nutpallet anchorage was proposed. Based on self-designed pulling test indoor with large structure, external anchorage bearing behavior of nut-pallet anchorage of GFRP anti-floating anchors was studied. The external anchorage deformation (slippage) and the ultimate capacity were also monitored during the test. The results show that the failure modes of the GFRP anti-floating anchors are pulled out. Under the condition of C25 concrete and the GFRP anti-floating anchors diameter with 28 mm, other conditions remain unchanged, the anchorage length is only changed, the limit supporting capacity of the external anchorage length with 30d is 384 kN, the maximum slippage is 8.98 mm, the generalized efficiency coefficient of external anchorage is 0.890, the generalized average bond strength is 5.20 MPa; the limit supporting capacity of the external anchorage length with 15d is 267 kN, the maximum slippage is 5.13 mm, the generalized efficiency coefficient of external anchorage is 0.619, the generalized average bond strength is 7.24 MPa. The average bond strength between the GFRP anti-floating anchors and the concrete reduces along with the increase of external anchorage length. Under the counter-pulled loads of each level, the generalized average bond strength between the GFRP anti-floating anchors and the concrete reduces along with the increase of test sample both sides slippage quantity. Finally, the generalized average bond strength increasing rate decreases along with the increase of slippage quantity unceasing.