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논문 기본 정보
- 자료유형
- 학술저널
- 저자정보
- 저널정보
- 한국콘크리트학회 International Journal of Concrete Structures and Materials International Journal of Concrete Structures and Materials Vol.12 No.2
- 발행연도
- 2018.2
- 수록면
- 269 - 278 (10page)
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초록· 키워드
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ACI 318-14 and 423.7-14 require the use of encapsulation system for an unbonded single-strand tendon for the purpose of corrosion protection and enhanced durability. In this study, load-carrying performance and hydrostatic tests were conducted for a newly developed, unbonded post-tensioning (PT) anchor with encapsulation, following the guidelines put forth in KCI-PS101 and ACI 423.7-14. The static load and fatigue tests as part of this study were used to evaluate the anchorage system behavior under static and cyclic loads, respectively. The hydrostatic test was used to demonstrate that the encapsulation system withstood at least 9.3 kPa of water pressure in a 24 h period according to ACI 423.7-14, and thus has been proven to promote the durability of unbonded PT single-strand tendons. Additionally, the push-in and jacking tests were used to assess the compressive and tensile strengths of the anchor as used in the field. Although these tests were not performed to failure for safety reasons, the anchor endured at least 1.18 and 1.02 times the nominal ultimate strength of a strand in each test, respectively. The authors’ previous load transfer tests were also reported in this paper, showing that test specimens with only two horizontal backup bars were capable of resisting at least 1.7 times the nominal ultimate strength of a strand. Based on the favorable results from the loadcarrying performance and hydrostatic tests, the developed encapsulated anchor systems are being applied in actual practice as an economically feasible option in Korean PT industry and are expected to improve the corrosion resistance and durability of posttensioned structures.
목차
Abstract
1. Introduction
2. Encapsulated Anchor System
3. Test Methods
4. Test Results and Discussion
5. Load Transfer Test
6. Applications to Real Buildings
7. Conclusions
References
참고문헌 (24)
참고문헌 신청
ACI Committee 318. (2014). Building code requirements for structural concrete (ACI 318-14) and commentary. Farmington Hills, MI: American Concrete Institute.
Architectural Institute of Korea. (2016). KBC 2016: Korean building code. Seoul: Architectural Institute of Korea. (both in Korean and English).
Cho, A. S., Cho, Y. W., Jeon, B. K., & Kang, T. H.-K. (2015). Development and performance test for unbonded posttensioned anchor. Journal of the Korea Concrete Institute, 27(1), 11?20. (in Korean).
Cho, A. S., & Kang, T. H.-K. (2017). Load transfer test of spirally reinforced anchorage zone for banded tendon group. Journal of the Korean Association for Spatial Structures, 17(1), 59?67. (in Korean).
EOTA. (2002). Guideline for European technical approval: Posttensioning kits for prestressing of structures (ETAG 013). Brussels: European Organisation for Technical Approvals.
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UCI(KEPA) : I410-ECN-0101-2018-532-001807903