FRP 보강재의 Box 형상 설계 및 거동 평가에 관한 연구
A Study on the Behavior Evaluation & Box Shape Designs of FRP Stiffeners
- 주제(키워드) 보강 , 유리섬유강화 , 복합재료 , 피복두께 , 보강효과 , Plate , Sandwich Box , Reinforced , GFRP , Concrete cover , Reinforced of effect
- 발행기관 江陵大學校 大學院
- 지도교수 鄭雨泳
- 발행년도 2008
- 학위수여년월 2008. 2
- 학위명 석사
- 학과 및 전공 土木工學科
- 원문페이지 x, 72 p.
- 본문언어 한국어
초록/요약
This paper presents the design, fabrication and performance of a reinforced concrete beam strengthened by GFRP box plate and its possibility for structural rehabilitations. The load capacity, ductility and failure mode of reinforced concrete structures strengthened by FRP box plate were investigated and compared with traditional FRP plate strengthening method. This is intended to assess the feasibility of using FRP box plate for repair and strengthening of damaged RC beams. A series of four-point bending tests were conducted on RC beams with or without strengthening FRP systems to evaluate the performance of rehabilitated RC beams after application of FRP plate and box types and to examine the influence of concrete cover thickness on the performance of overall stiffness of the structure. The parameters obtained by the experimental studies were the stiffness, strength, crack width and pattern, failure mode, respectively. The test yielded complete load-deflection curves from which the increase in load capacity and the failure mode was evaluated. Results from this study show that the use of load and first crack and post cracking stiffness of all beams was increased primarily due to flexural GFRP. Compared to RC beams without FRP strengthening system, the increase of static capacity for FRP plate and box type systems was proved to be 38% and 79% respectively when compared to an unstrengthened RC beam. For the study of concrete cover thickness, it is informed that flexural effect strengthened by FRP system should be reduced as the cover thickness is decreased. Test results suggest that RC beams strengthened by FRP plate and box section sis capable of substantially increasing the load capacity and is effective in strengthening and repair of damaged RC beams. The results of the investigation will be used to develop design guidelines governing the use of GFRP box type for repairing and strengthening of damaged RC beams.
more목차
제 1장 서론 = 1
1.1 연구배경 및 목적 = 1
1.2 연구내용 및 방법 = 3
1.3 국내외 연구동향 = 4
1.3.1 국내 연구동향 = 4
1.3.2 국외 연구동향 = 6
제 2장 복학재료의 특성 및 보강재 설계 = 9
2.1 복합재료의 특성 = 9
2.1.1 복합재료의 정의 = 9
2.1.2 복합재료의 성형방법 = 10
2.2 복합재료 보강재 설계 = 11
2.2.1 보강재 설계 개요 = 11
2.2.2 보강재 설계 = 14
2.2.2 샌드위치 패널 설계 = 20
제 3장 FRP 보강 철근 콘크리트 보의 휨 실험 = 24
3.1 실험방법 및 계획 = 24
3.2 실험 재료 = 25
3.2.1 철근 및 콘크리트 = 25
3.2.2 섬유 및 매트릭스 수지 = 27
3.2.3 실험체 및 보강재 제작 = 30
3.3 실험체 설치 및 실험 = 37
제 4장 실험 결과 및 고찰 = 40
4.1 하중-처짐 관계 비교 = 40
4.2 휨 실험에 따른 균열 및 파괴모드 = 50
제 5장 해석적 연구 = 55
5.1 유한요소법 및 해석과정 = 55
5.2 ABAQUS를 이용한 Sandwich Box core의 설계 = 57
5.2.1 Sandwich Box core의 설계 = 57
5.2.2 해석 결과 및 두께 산정 = 59
5.3 ABAQUS를 이용한 보의 휨 해석 = 61
5.3.1 보의 휨 해석 = 61
5.3.2 해석 결과 및 분석 = 64
제 6장 결론 = 68
참고문헌 = 71
