Assessment of shear capacity in NSM prestressed FRP strengthening with anchorage conditions AITranslate

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DOI：https://doi.org/10.1016/j.cscm.2023.e02743

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Highlights • Shear capacity of anchorage device NSM-prestressed FRP strengthening studied. • 3D FEA was performed to compare the experimental and FEA behaviors. • Type B device closely attached to front side concrete increased ultimate load. • Thorough epoxy-resin filling to ensure excellent shear capacity for anchorage. • FEA model predicted anchoring behavior and failure mode of anchorage devices. Efforts to achieve a defect-free flat groove in near-surface-mounted prestressed fiber-reinforced polymer (FRP) strengthening systems have proven challenging. Despite attempts, attaining an ideal groove remains formidable. In this system, anchorage device installation involves injecting epoxy resin into groove defects to achieve planarity. Structural behavior analysis and optimization of the anchorage device were conducted based on device type, anchor type, and defect depth through shear loading tests. The mechanical anchor demonstrated an ultimate load of 261 kN, with failure modes including concrete cracking, concrete compression failure, and anchor tensile failure. The chemical anchor exhibited an ultimate load of 390 kN, with its final failure attributed to anchor tensile failure. The ultimate load capacity of anchorage device surpassed that of a carbon FRP(CFRP) bar by up to 62.5%. In a parametric study, the shear strength of the anchorage device was explored concerning concrete compressive strength and anchor diameter. The ultimate load of the proposed model with low concrete compressive strength proved insufficient compared to the strength of CFRP rebar. Graphical Download : Download high-res image (155KB) Download : Download full-size image