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Structural Engineering and Mechanics
  Volume 59, Number 5, September10 2016 , pages 867-883

Influence of steel fiber and reinforcing details on the ultimate bearing strength of the post-tensioning anchorage zone
Jin-Kook Kim, Jun-Mo Yang and Yangsu Kwon

    In this paper, the effects of steel-fiber and rebar reinforcements on the ultimate bearing strength of the local anchorage zone were investigated based on experiments and comparisons between test results and design-equation predictions (AASHTO 2012, NCHRP 1994). Eighteen specimens were fabricated using the same anchorage device, which is one of the conventional anchorage devices, and two transverse ribs were used to secure an additional bearing area for a compact anchorage-zone design. Eight of the specimens were reinforced with only steel fiber and are of two concrete strengths, while six were reinforced with only rebars for two concrete strengths. The other four specimens were reinforced with both rebars and steel fiber for one concrete strength. The test and the comparisons between the design-equation predictions and the test results showed that the ultimate bearing strength and the section efficiency are highly affected by the reinforcement details and the concrete strength; moreover, the NCHRP equation can be conservatively applied to various local anchorage zones for the prediction of the ultimate bearing strength, whereby conditions such as the consideration of the rib area and the calibration factor are changed.
Key Words
    post-tension; anchorage; bearing strength; steel fiber; local anchorage zone
Jin-Kook Kim, Jun-Mo Yang: Steel Structure Research Group, POSCO, 100, Songdogwahak-ro, Yeonsu-gu, Incheon, 21985, Republic of Korea
Yangsu Kwon: Site & Structural Engineering Group, KHNP Central Research Institute, 70, 1312-gil, Yuseong-daero, Yuseong-gu, Daejeon, 34101, Republic of Korea

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