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논문 기본 정보

자료유형
학술저널
저자정보
Nima Hashemi (Shahid Rajaee Teacher Training University) Sina Hassanpour (Sharif University of Technology) Asghar Vatani Oskoei (Shahid Rajaee Teacher Training University)
저널정보
한국콘크리트학회 International Journal of Concrete Structures and Materials International Journal of Concrete Structures and Materials Vol.16 No.3
발행연도
2022.5
수록면
287 - 302 (16page)

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초록· 키워드

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Low-strength concrete (LSC) elements are prone to several seismic and static loads and are one of the priorities to be considered for FRP strengthening. However, certain provisions should be taken into account according to provisions, as elements with considerably low compressive strength are not eligible for FRP confinement. This experimental study investigates (1) the effect of rebar planting on increasing the initial compressive strength of LSC to achieve allowable compressive strength for FRP strengthening, and (2) the effect of CFRP confinement on increasing the strength of rebar-embedded specimens and determining the most effective factor for strength improvement. For this purpose, 38 standard concrete cylinders were tested under compressive load. The variables of this study were rebar length and diameter, the compressive strength of concrete, and the number of CFRP sheets. Two initial compressive strengths below the designated compressive strength of 17 ㎫ (12.5 and 14.5 ㎫) were selected. After determining rebar-reinforced specimens with compressive strength of more than 17 ㎫, CFRP confinement and compressive tests of these cylinders were utilized. A statistical single-factor ANOVA analysis is performed to determine the most effective variable for ultimate strength and strain, individually. In the end, available models in the literature were utilized to predict experimental data. The results indicated the effectiveness of rebar planting for strength enhancement up to 53%, also showing that specimens with initial compressive strength of 14.77 ㎫ were suitable for CFRP confinement after rebar planting. The experimental and statistical ANOVA results demonstrated the CFRP confinement and its interaction with rebar embedment as the most effective factors with respect to increasing the load-bearing capacity of LSC concrete.

목차

Abstract
1. Introduction
2. Material Properties
3. Experimental Procedure
4. Test Results
5. Analysis of the Force–Deformation Diagram of Rebar
6. ANOVA Analysis
7. Verification of Test Results
8. Conclusion
9. Suggestions for Future Work
References

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