표제지
감사의 글
목차
Notations 12
Abstract 13
연구사 15
I. 서론 16
1. 연구배경과 목적 16
2. 연구 동향 17
3. 연구 범위와 방법 18
II. 스트레인 게이지의 구조 및 원리 19
1. 스트레인 게이지 구조 19
2. 스트레인 게이지 원리 21
3. 스트레인 게이지 연결 방식(휘스톤 브리지회로) 22
III. 콘크리트의 일축응력 및 탄성계수 25
1. 콘크리트의 압축응력 25
2. 콘크리트의 탄성계수 28
IV. 실험 및 고찰 30
1. 콘크리트 공시체 제작 및 양생 31
1.1. 콘크리트 슬럼프 및 공기량 시험 31
1.2. 콘크리트 공시체 제작 및 수중양생 33
2. 스트레인 게이지 부착 및 콘크리트 압축실험 35
2.1. 스트레인 게이지 부착 35
2.2. 콘크리트 공시체 압축실험 36
3. 콘크리트 공시체 축과 스트레인 게이지 축의 각도에 따른 응력-변형률 곡선 38
3.1. 스트레인 게이지 부착 각도가 0˚인 경우 38
3.2. 스트레인 게이지 부착 각도가 2˚인 경우 45
3.3. 스트레인 게이지 부착 각도가 4˚인 경우 53
3.4. 스트레인 게이지 부착 각도가 6˚인 경우 62
3.5. 스트레인 게이지 부착 각도가 8˚인 경우 70
3.6. 스트레인 게이지 부착 각도가 10˚인 경우 78
3.7. 스트레인 게이지 부착각도에 따른 평균곡선 86
3.8. 부착 각도가 0˚에 대한 오차 계산 88
3.9. 스트레인 게이지 부착각도에 따른 탄성계수 및 전단탄성계수 90
V. 결론 93
References 94
Table 1. Vertical and circumferential strain according to stress increase… 38
Table 2. Vertical and circumferential strain according to stress increase… 40
Table 3. Vertical and circumferential strain according to stress increase… 41
Table 4. Vertical and circumferential strain according to stress increase… 45
Table 5. Vertical and circumferential strain according to stress increase… 47
Table 6. Vertical and circumferential strain according to stress increase… 49
Table 7. Vertical and circumferential strain according to stress increase… 53
Table 8. Vertical and circumferential strain according to stress increase… 56
Table 9. Vertical and circumferential strain according to stress increase… 58
Table 10. Vertical and circumferential strain according to stress increase… 62
Table 11. Vertical and circumferential strain according to stress increase… 64
Table 12. Vertical and circumferential strain according to stress increase… 66
Table 13. Vertical and circumferential strain according to stress increase… 70
Table 14. Vertical and circumferential strain according to stress increase… 72
Table 15. Vertical and circumferential strain according to stress increase… 74
Table 16. Vertical and circumferential strain according to stress increase… 78
Table 17. Vertical and circumferential strain according to stress increase… 80
Table 18. Vertical and circumferential strain according to stress increase… 82
Table 19. Elastic modulus and shearing elastic modulus according to sticking angle 90
Fig. 1. Shape of strain-gauge and member deformation 19
Fig. 2. Wheastone bridge circuit 22
Fig. 3. Single axial stress 25
Fig. 4. Stress in section c-d 25
Fig. 5. Concrete elastic modulus 28
Fig. 6. Variable vertical strain according to vertical stress 43
Fig. 7. Variable circumferential strain according to vertical stress 44
Fig. 8. Variable vertical strain according to vertical stress 51
Fig. 9. Variable circumferential strain according to vertical stress 52
Fig. 10. Variable vertical strain according to vertical stress 60
Fig. 11. Variable circumferential strain according to vertical stress 61
Fig. 12. Variable vertical strain according to vertical stress 68
Fig. 13. Variable circumferential strain according to vertical stress 69
Fig. 14. Variable vertical strain according to vertical stress 76
Fig. 15. Variable circumferential strain according to vertical stress 77
Fig. 16. Variable vertical strain according to vertical stress 84
Fig. 17. Variable circumferential strain according to vertical stress 85
Fig. 18. Vertical average strain curve according to sticking angle 86
Fig. 19. Circumferential average strain curve according to sticking angle 87
Fig. 20. Vertical strain error for sticking angle 0˚ 88
Fig. 21. Circumferential strain error for sticking angle 0˚ 89
Fig. 22. Variable elastic modulus according to sticking angle 91
Fig. 23. Variable shearing elastic modulus according to sticking angle 92
Photo. 1. Concrete quality test 31
Photo. 2. Concrete test specimen manufacture and underwater curing 33
Photo. 3. Strain gauge sticking 35
Photo. 4. Compressive test instrument and concrete test specimen fracture aspect 36