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FRP 긴장재로 외부 보강된 철근콘크리트 보의 피로거동

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Alternative Title
Fatigue Behavior of Externally Strengthened Reinforced Concrete Beams with FRP Tendon
Abstract
Of the reinforcing methods of structures which are used at the present, the external prestressing method which has the excellent internal force and hardness improvement effect comparing to other engineering methods is being much frequently used. The recent study trend brings the study to forecast the ultimate capability of the structures reinforced by the external prestressing method into many focuses. But, it is the practical state that regarding to the structure reinforced by the external prestressing, the evaluation about fatigue performance by the repeated loads is poor and the studies on that are very poor. Accordingly this study wanted to evaluate the stability and the appropriateness of external prestressing method as analyzing the characteristic of fatigue movement according to the repeated loads of ferroconcrete bean externally reinforced with FRP tendon.
The expected shape of destruction about the repeated loads of ferroconcrete bean externally reinforced with FRP tendon can be forecasted as adhesion fatigue destruction of anchorage, bending tensility fatigue destruction of tendon at the front part of anchorage, pressure fatigue destruction of concrete, fatigue destruction of tensile iron bar and adhesion fatigue destruction of iron bar and concrete.
This experiment study performed the experiments while selecting the kinds of external tendons(non-reinforcing, FRP tendon and Steel tendon) and the level of load(the level of stress) as the comparative variable.
The load was experimented with the cycle of 3 Hz as using sine wave in the 4 points loading method as changing Max. load into 70~85% while regarding Min. load as 50% based on iron bar-surrender load of FRP-reinforced experimenting body.
As the result of experiment, fatigue destruction shape of ferroconcrete bean externally reinforced with FRP tendon showed not fatigue destruction related to FRP tendon but fatigue destruction of internal tensile iron bar or fatigue destruction of the adhesion of iron bar and concrete. This is judged to be more safe because external FRP tendon is not adhered and the stress is standardized over the whole length of tension member. Fatigue strength over 2 million times from S-N curve was appeared as about 74%.
Accordingly, from the fatigue experiment about ferroconcrete beam externally reinforced with FRP tendon, FRP external prestressing method was confirmed to have the safety about the fatigue at FRP tendon, bending part of deviator and equipment of fixing apparatus, etc.
Author(s)
홍성룡
Issued Date
2008
Awarded Date
2008. 2
Type
Dissertation
URI
http://dcoll.jejunu.ac.kr/jsp/common/DcLoOrgPer.jsp?sItemId=000000004265
Alternative Author(s)
Hong, Seong-Yong
Affiliation
제주대학교 대학원
Department
대학원 토목해양공학과
Advisor
박상렬
Table Of Contents
I. 서론 = 1
1. 연구 배경 및 목적 = 1
2. 연구 방법 = 4
II. 철근 콘크리트 보의 피로 해석방법 및 파괴형태 = 5
1. 피로 해석방법 = 5
1.1. 통계학적 방법 = 5
1.2. 손상역학적 방법 = 7
1.3. 파괴역학적 방법 = 10
2. 피로 파괴형태 = 12
2.1. 사인장 파괴 = 12
2.2. 콘크리트 압축파괴 = 13
2.3. 부착파괴 = 13
2.4. 인장철근 취성파괴 = 14
III. 실험 준비 = 15
1. 시험체 제원 = 15
2. 실험 변수 = 16
3. 시험체 제작 = 17
4. 사용 재료 = 19
4.1. 콘크리트 = 19
4.2. 철근 = 20
4.3. FRP와 Steel 긴장재 = 20
5. 정착과 긴장 = 22
6. 실험 및 데이터 수집 = 23
6.1. 재하장치 및 방법 = 23
6.2. Data 측정방법 = 24
IV. 실험결과 및 분석 = 26
1. 정적실험 결과 및 분석 = 26
2. 피로실험 결과 및 분석 = 28
2.1. 시험체 별 피로실험 결과 분석 = 29
2.1.1. 무보강 시험체 (RU70 시험체) = 29
2.1.2. FRP 긴장재로 외부 보강된 시험체(RF70, RF75, RF80, RF85) = 31
2.1.3. Steel 긴장재로 외부 보강된 시험체(RS70 시험체) = 43
2.2. 반복 횟수에 대한 균열성장과 파괴형태 = 46
2.3. 피로강도와 S-N 선도 = 50
2.4. FRP 긴장재로 외부 보강된 시험체의 확률해석 = 54
2.4.1. 개요 = 54
2.4.2. Weibull 분포 = 54
2.4.3. FRP 긴장재로 외부 보강된 시험체의 확률 해석 결과 = 56
V. 결론 = 58
VI. 참고문헌 = 59
Degree
Master
Publisher
제주대학교 대학원
Citation
홍성룡. (2008). FRP 긴장재로 외부 보강된 철근콘크리트 보의 피로거동
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General Graduate School > Civil and Ocean Engineering
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