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논문 기본 정보

자료유형
학술저널
저자정보
Jehan H. Aly (Ain Shams University) A. Farghal Maree (Ain Shams University) Mohamed Kohail (Ain Shams University) Ayman H. Khalil (Ain Shams University)
저널정보
한국콘크리트학회 International Journal of Concrete Structures and Materials International Journal of Concrete Structures and Materials Vol.18 No.6
발행연도
2024.11
수록면
1,213 - 1,226 (14page)

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초록· 키워드

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The bond between prestressing strands and concrete within the dead-end zone of a post-tensioned concrete member significantly influences the effectiveness of the strand-concrete system. However, the existing code equations for determining development length rely on studies conducted on pretensioned concrete members rather than post-tensioned ones. As a result, the implementation of development length for prestressing strands with bulb-shaped dead end anchorage in post-tensioning slabs relies on common practice and former experience. Unfortunately, this can sometimes lead to concrete cracks or strand slippage at the dead end zone due to insufficient development length. This paper presents an experimental study on post-tensioning slab segments representing the dead end zone. The aim of this study is to assess the development length of prestressing strands with bulb-shaped dead end that shall guarantee full bond with concrete throughout the member’s service life. The Specimens were divided according to three different concrete compressive strengths 34 MPa, 48 MPa and 70 MPa. The parameters considered included slab thicknesses of 160 mm and 250 mm, as well as strand embedment lengths of 700 mm and 850 mm. Based on the test results, the sufficient development length was determined. Furthermore, a verification was carried out to assess the validity of applying predicted equations from an adopted bond model to determine the bond strength of strand with bulb-shaped dead end anchorage in concrete slabs.

목차

Abstract
1. Introduction
2. Research Significance
3. Experimental Work
4. Material Properties
5. Specimen Dimensions
6. Specimen Preparation and Reinforcement Details
7. Specimens Configuration
8. Test Setup
9. Test Results and Discussions
10. Crack Pattern and Failure Mode
11. Load-Displacement Relationships
12. Bond Model Background
13. Verification of the Adopted Bond Model
14. Conclusion
References

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