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Title |
Code Change for using the High-Strength(550 MPa) Headed Deformed Bars of Large-Sized Diameter(57 mm) in Concrete Containments
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Authors |
이병수(Byung-Soo Lee) ; 임상준(Sang-Jun Lim) ; 윤현도(Hyun-Do Yun) |
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DOI |
https://doi.org/10.11112/jksmi.2017.21.6.147 |
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Keywords |
확대머리 철근 ; 표준갈고리 철근 ; 정착길이 ; 횡보강 철근 ; 순피복 두께 Headed deformed bars ; Standard hooked bars ; Development length ; Transverse reinforcement ; Clear cover thickness |
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Abstract |
Generally, significant amount of reinforcements are used in nuclear power plant structures and it may cause several potential problems during the construction. In particular, it is more difficult to pour concrete into structural member joint area than other areas because of the significant congestion of the joint area due to a lot of hooked bars, embedded materials, and other reinforcements. The purpose of this study is to solve these problems due to the reinforcement congestion by using the high-strength(ASTM A615 Gr.80) headed deformed bars of large-sized diameter(43 mm & 57 mm) in nuclear power plant structures as a alternative of standard hooked bars. In order to use headed deformed bars effectively, It is necessary to find the method how to relax limits on their use while maintaining or improving the anchorage capacity. Therefore, this study will analyze the results of tests planned to evaluate the influence of the restricted variables, such as bar size, yield strength, clear cover thickness.
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