DOI: 10.11648/j.jccee.20261103.13 ISSN: 2637-3890

In-vitro Testing and Analysis of the Anchoring Capacity of Steel Anchor Plates in Chemical-Anchor-Based Prestressed Reinforcement

Liya Pei, Jun Song, Jifeng Wen, Peng Kang, Jing Huang
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To verify the reliability of the composite anchoring system consisting of chemical anchors and anchoring adhesive for the external prestressing reinforcement of concrete T-beams, this study conducted a systematic investigation through laboratory tests, theoretical derivations, and finite element simulations using MIDAS/FEANX. Tensile pull-out tests were designed using chemical anchors with three diameters (12, 16, and 20 mm) and five embedment depths ranging from 5D to 10D. Concurrently, tests were conducted on C50 concrete specimens to evaluate the bond strength at the adhesive interface and the composite anchorage capacity. Relevant theoretical formulas were derived, numerical models were established, and the failure modes and load differences were compared and analyzed. The results indicate that chemical anchors primarily exhibit a combined conical-adhesive failure mode. For 16 mm anchors with embedment depths ranging from 6.5D to 10D, the safety factor reaches 1.45 to 2.02. The anchoring adhesive increases the initial stiffness of the steel anchor seat by 42.6%, and the ultimate load-bearing capacity of the composite system is 93.7% higher than that of specimens using pure anchoring adhesive. The average error between the theoretically derived formula and experimental values was 5.8%, and the relative error between finite element simulation results and experimental values was 5.3%, both demonstrating high accuracy.

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