표제지
목차
제1장 서론 11
1.1. 연구 배경 11
1.2. 연구 목적 13
1.3. 논문 구성 15
제2장 선행연구 및 설계기준 16
2.1. 선행연구 16
2.1.1. 합성부재 기본원리 16
2.1.2. 해외 연구 동향 17
2.1.3. 국내 연구 동향 19
2.2. 설계기준 23
2.2.1. 단일현장타설말뚝 기초공법 적용 기준(한국도로공사, 2004) 23
2.2.2. 단일현장타설말뚝 설계기준 개선(한국도로공사 실무자료집, 2017) 25
2.3. 소결 30
제3장 단일현장타설말뚝의 개념 및 연구방법 31
3.1. 단일현장타설말뚝의 개념 31
3.2. 연구방법 33
3.2.1. 한계상태설계법 극단상황한계상태 33
3.2.2. 내진해석 35
3.2.3. 지반반력계수 40
3.2.4. 희생강관 강성 41
제4장 매개변수 구조해석 46
4.1. 연구대상 교량과 지반조건 46
4.1.1. 연구대상 교량 46
4.1.2. 지반조건 47
4.2. 기본모델해석 48
4.2.1. 모델링 48
4.2.2. 해석결과 53
4.3. 매개변수 연구 56
4.4. 해석결과 59
4.4.1. 유효강성 분석 59
4.4.2. 변위 분석 61
4.2.3. 단면력 분석 63
4.2.4. 충전형 합성기둥에 의한 안전성 검증 79
제5장 결론 83
참고문헌 86
국문초록 89
Abstract 90
Table. 2.1. Review on Relevant Research 17
Table. 2.2. Improvements in Design Criteria 25
Table. 2.3. Flexural Stiffness a Single Drilled Shafts Pile... 27
Table. 2.4. Contribution to Sectional Forces 27
Table. 2.5. Flexural Stiffness a Single Drilled Shafts Pile... 28
Table. 3.1. Reinforcement Ratio(ρ) 32
Table. 3.2. Load Combination considering Earthquake Load (KDS 24... 34
Table. 3.3. Load factor for γp(KDS 24 10 11, 2016)(이미지참조) 34
Table. 3.4. Seismic Analysis Method 35
Table. 3.5. Comparison of Upper Limits of Material Strength 42
Table. 3.6. Comparison of Plate-Width Thickness Ratio 43
Table. 3.7. Comparison of Formulas of Effective Flexural Stiffness 43
Table. 3.8. Reduced Thickness due to Corrosion of Steel Pipes 45
Table. 4.1. Elastic Modulus of Subgrade 47
Table. 4.2. Elastic Bearing Specification and Spring's Constants 49
Table. 4.3. Materials used in the Basic Model 51
Table. 4.4. Sectional Properties of the Basic Model 51
Table. 4.5. Coefficients of Subgrade Reaction of the Basic Model 52
Table. 4.6. Displacements and Sectional Forces of the Basic Model 54
Table. 4.7. Strength of the Basic Model 55
Table. 4.8. Shape and Material of Permanent Steel Casing 56
Table. 4.9. Parameter Table 57
Table. 4.10. Steel Thickness and Effective Stiffness Coefficient of... 58
Table. 4.11. Coefficients of Subgrade Reaction of Parameters(κH)(이미지참조) 58
Table. 4.12. Effective Stiffness according to Thickness Change of a... 59
Table. 4.13. Displacement according to Thickness Change of a... 61
Table. 4.14. Maximum Sectional Force to Thickness Change of a... 63
Table. 4.15. Contribution Ratio to Thickness Change of Permanent... 67
Table. 4.16. CASE-1 Buckling of Permanent Steel Casing 73
Table. 4.17. CASE-2 Buckling of Permanent Steel Casing 73
Table. 4.18. CASE-3 Buckling of Permanent Steel Casing 74
Table. 4.19. Strength of Reinforced Concrete Columns 75
Table. 4.20. Strain Compatibility and Plastic Stress Distribution 79
Fig. 1.1. Conceptual View of Single Drilled Shafts Pile Foundation 11
Fig. 2.1. Reinforcement Effect of Steel Pipe and Concrete Composite Structure 16
Fig. 2.2. Improvement of Cast-In-Place Concrete Pile 19
Fig. 2.3. Proposal Formula of Effective Stiffness 20
Fig. 2.4. 3D Finite Element Analysis of Interface 20
Fig. 2.5. 3D Finite Element Analysis considering Subgrade Condition 21
Fig. 2.6. Modeling of Numerical Analysis 22
Fig. 2.7. Modeling for Lateral Analysis a Single Drilled Shafts Pile... 24
Fig. 2.8. Modeling for Longitudinal Analysis a Single Drilled Shafts... 24
Fig. 2.9. M-φ Curve and Bending Moment–Flexural Stiffness Curve 26
Fig. 2.10. Design Flow for Improvement of Design Standard a... 29
Fig. 3.1. Concept Classification a Single Drilled Shafts Pile... 31
Fig. 3.2. Normalized Elastic Seismic Response Coefficient (A) for... 36
Fig. 3.3. Model of Seismic Structural Analysis 37
Fig. 3.4. Modeling of Deep Foundations 38
Fig. 3.5. Combination of Seismic Forces 39
Fig. 3.6. Confinement Effect of CFT Column 41
Fig. 4.1. Overview of the Bridge 46
Fig. 4.2. Basic Model 48
Fig. 4.3. Overview of Pier Modeling and Connections 50
Fig. 4.4. Displacement of the Basic Model 53
Fig. 4.5. Bending Moment of the Basic Model 53
Fig. 4.6. Axial Force of the Basic Model 54
Fig. 4.7. P-M Interaction Diagram of the Basic Model 55
Fig. 4.8. Relationship between Effective Stiffness and Steel Casing... 60
Fig. 4.9. Relationship between Displacement and Steel Casing... 62
Fig. 4.10. Relationship between Maximum Sectional Force and... 64
Fig. 4.11. Relationship between Contributed Axial Force and Steel... 68
Fig. 4.12. Relationship between Contribution Ratio of Axial Force... 68
Fig. 4.13. Relationship between Contributed Bending Moment and... 69
Fig. 4.14. Relationship between Contribution Ratio of Bending... 69
Fig. 4.15. P-M Interaction Diagram of CASE-1 76
Fig. 4.16. P-M Interaction Diagram of CASE-2 77
Fig. 4.17. P-M Interaction Diagram of CASE-3 78
Fig. 4.18. P-M Interaction Diagram of Plastic Stress Distribution 80
Fig. 4.19. CFT P-M Interaction Diagram of CASE-1 81
Fig. 4.20. CFT P-M Interaction Diagram of CASE-2 81
Fig. 4.21. CFT P-M Interaction Diagram of CASE-3 82