Experimental analysis explores anchorage bearing capacity in new composite materials, revealing significant effects of bonding length and crimping pressure.
To fully utilize the tensile strength of fiber-reinforced polymer (FRP) bars and prevent shear failure near the anchor head, a new type of adhesive- and pressure-combined steel–plastic composite anchor was designed. Through pull-out tests on 42 new anchor specimens, the effects of the bonding length and crimping pressure on the anchoring performance were studied. The test results showed three typical failure modes of the anchor: pull-out failure, splitting failure, and pull-off failure. Among these, splitting failure best represented the full utilization of the tensile strength of FRP bars and give full play to the bearing capacity of the anchor. Increasing the bonding length of the anchor and applying circumferential normal force crimping could help improve the ultimate bearing capacity of the anchor. Based on the test results, a calculation formula for the ultimate bearing capacity of the anchor in relation to the crimping pressure and the relative anchoring length was proposed. This formula can provide theoretical guidance for the design of new anchors.
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Sun et al. (2025) studied this question.
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