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Investigation of Reinforced Concrete Inclined Shear Plane Strengthened by U-Wrapped TRM jacket with Different Anchorage Details using Modified Push-off Tests

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Abstract

This study was conducted to understand the effects of anchored systems for shear strengthening of an inclined shear plane in reinforced concrete, using an externally U-wrapped textile-reinforced mortar (TRM) jacket. The main test parameters were the textile reinforcement ratios adopted in the TRM composite and the different anchorage details utilized at both ends of the U-wrapped TRM jacket. Two textile reinforcement ratios of 0.152% and 0.304% were adopted for the TRM jacket, corresponding to the use of two and four textile layers, respectively. The investigated anchorage details included (a) fiber-reinforced polymer (FRP) anchors; (b) mechanical anchors; (c) textile-anchored by re-bar inserted in a groove; and (d) textile-anchored by re-bar inserted in a groove, combined with FRP anchors. Modified push-off tests were conducted to partially simulate the development of the 45° diagonal failure plane in reinforced concrete (RC) beams subjected to a combination of shear and tension. The test results indicated the effectiveness of the proposed anchorage details in enhancing the contribution of the TRM jacket to the shear resistance capacity of the specimens, before and after the formation of the critical shear crack. Additionally, the strain of the internal shear reinforcement after attaining peak load considerably decreased, and the effective strain developed in the TRM composite was also ameliorated using the anchorage details.

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Acknowledgements

The authors wish to gratefully acknowledge the financial support received through grant (21CTAP-C152105-03) from the Infrastructure and Transportation Technology Promotion Research Program, funded by the Ministry of Land, Infrastructure and Transport of the Korean Government, and grant (NRF-2020R1F1A1051051) from the Basic Science Research Program of the National Research Foundation of Korea, funded by the Ministry of Education.

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  1. School of Architecture, Soongsil University, 369 Sangdo-fro, Dongjak-gu, Seoul, 153-743, Korea

    Ngoc Hieu Dinh, Seung-Hee Kim, Sang-Hyun Park & Kyoung-Kyu Choi

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  1. Ngoc Hieu Dinh
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  2. Seung-Hee Kim
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Correspondence to Kyoung-Kyu Choi.

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Dinh, N.H., Kim, SH., Park, SH. et al. Investigation of Reinforced Concrete Inclined Shear Plane Strengthened by U-Wrapped TRM jacket with Different Anchorage Details using Modified Push-off Tests. Arab J Sci Eng 47, 4003–4021 (2022). https://doi.org/10.1007/s13369-021-05855-6

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