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Title |
Performance Evaluation of Precast Deck Joints Using Ultra High-Performance Concrete Part 2: Proposal of Bond Strength and Development Length Model
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Authors |
강호비(Ho-Bi Kang) ; 임동규(Dong-Gyu Lim) ; 김영진(Young-Jin Kim) ; 최명성(Myoung-Sung Choi) |
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DOI |
https://doi.org/10.4334/JKCI.2025.37.5.573 |
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Keywords |
설계기준; 초고강도; 부착응력; 프리캐스트; 부착강도 식 제안 design standard; high-strength; bond stress; precast; proposal of a bond strength equation |
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Abstract |
This follow-on work examines the limitations of existing design standards in estimating the bond strength and development length of ultra-high-performance concrete (UHPC) and proposes an improved design equation. To achieve this, domestic and international design standards were reviewed, and a lap splice test was conducted to evaluate the bond performance of UHPC. The experimental results revealed that existing design standards may not fully reflect the actual bond performance of UHPC. For example, Eurocode 2, KDS, and the Fiber-Reinforced SUPER Concrete Structural Design Guidelines estimate bond strength based on pull-out tests, while neglecting splice length. Although ACI 318 considers the effect of splice length on bond performance, it is based on empirical formulas derived for conventional concrete, resulting in discrepancies when applied to UHPC. To address these issues, this work proposes a new bond strength model and development length equation that more accurately reflect UHPC bond characteristics. The proposed approach is expected to optimize bond performance, enhance structural safety, and improve the efficiency of precast construction employing UHPC.
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