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논문 기본 정보

자료유형
학술저널
저자정보
Hyeon‑Jong Hwang (Konkuk University) Fan Yang (Hunan University) Li Zang (Hunan University) Jang‑Woon Baek (Korea Military Academy) Gao Ma (Hunan University)
저널정보
한국콘크리트학회 International Journal of Concrete Structures and Materials International Journal of Concrete Structures and Materials Vol.14 No.5
발행연도
2020.9
수록면
711 - 727 (17page)

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초록· 키워드

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Impact loading damage of reinforced concrete (RC) members deteriorates bond strength of reinforcing bars. To understand the effect of strain rate on the bond strength of reinforcing bars in RC beams under impact load, drop hammer test was performed on twenty-four simply supported RC beams with lap spliced bars at the mid-span. The test parameters were reinforcing bar diameter, splice length, drop height, and hammer mass. The dynamic responses including the impact load history, mid-span deflection history, crack distribution, and strain history of reinforcing bar were evaluated. Although the designed bar development length was 31–69% of the requirement of current design codes under static load, the tensile strength of bar splices was greater than the dynamic yield strength when subjected to large impact energy under impact load. On the basis of the test results, existing design equations for the bar development length under static load were modified to consider the impact loading effect on the bond strength. Factors related to the strain rate effect of materials, impact damage, and impact energy loss were proposed. The prediction of the proposed method agreed well with the tensile strength of bar splices under impact load.

목차

Abstract
1. Introduction
2. Test Program
3. Test Results
4. Evaluation of Structural Performance Under Impact Load
5. Prediction for Bar Development Length
6. Summary and conclusions
References

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