축하중을 받는 철골부재의 비탄성좌굴 및 응답거동에 관한 연구
- Issued Date
- 2012
- Abstract
- 서로 다른 구속조건에 대한 철골부재의 비탄성좌굴과 비선형 응답거동을 평가하기 위해 유한요소해석을 수행하였다.
첫 번째, 서로 다른 구속조건(양단힌지, 양단고정)을 가지는 H형강 기둥부재의 비탄성 좌굴거동을 검토하기 위하여 세장비에 크기에 따라 기둥부재를 모델링하여 좌굴후 비탄성 거동특성, 최대내력의 변화, 잔존내력 및 에너지 흡수능력에 대해서 평가하였다. 더욱이, 실재하실험결과와 해석결과값을 비교하여 해석결과와의 정합성에 대해서도 검토하였다.
건축물에 가해지는 수평하중(지진하중과 풍하중)에 주로 저항하는 브레이스 시스템은 매우 복잡한 반복거동을 수행하고 있음에도 불구하고 거동특성은 아직 명확하게 제시되고 있지 못하다. 본 논문에서는 CHS(원형 중공형)강재와 H형 강재로 구성된 브레이스 부재의 비선형 응답특성을 검토하였다.
또한, 제진시스템에 사용되는 댐퍼는 지진으로 인한 피해를 완화시키기 위한 에너지흡수장치는 최근 그 중요성이 더욱 강조되고 있다. 전단패널형 강재이력댐퍼와 원형파이프 강재애력댐퍼의 비탄성 지진응답 거동특성을 파악하기 위하여 유한요소해석을 실시하였다. 또한 해석결과를 실재하실험값과 비교하여 해석결과의 타당성을 검토하였다.|A nonlinear analytical approach for evaluating the inelastic buckling and response behavior of steel members for different condition was carried out. The inelastic buckling behavior of H-section steel column member was studied in this thesis for two different cases: pinned-pinned constraint condition and fixed-fixed constraint condition.
A steel column member subjected to an axial compression load will shorten in the direction of load. If the load increased until the column buckles, the shortening will stop and the column will suddenly bend or deform laterally and may at the same time twist in a direction perpendicular to its longitudinal axis. But before final buckling or collapse, steel column member has a tendency of plastic deformation. The issue has been much discussed along with the evaluation of plastic deformation capacity and restoring force of column members in the large deformation range following post-buckling.
In order to predict the inelastic buckling behavior of the member, the load-deformation relationship needs to be identified in the whole process. The plastic deformation of column members and its loading energy absorption capacity through identifying inelastic buckling behavior will elucidate how to prevent progressive collapse of structures. In addition to nonlinear FE analysis, compression test on an H-shaped column member was carried out and both plastic deformation mode and load-deformation curve was compared for further verification of the analysis result.
Steel bracing members which are used to resist lateral loads (seismic load and wind loads) on the building structures are evaluated for CHS (circular hollow section) and H-section in the same way. The inelastic response of bracing members under cyclic axial loading was tried to evaluate analytically. The hysteresis loop shape is compared with test result from available literatures. The cyclic behavior of bracing member is complex and accurately not yet investigated. Although this issue needs further study, it is tried to present both the buckling behavior and the cyclic characteristics of bracing members of CHS and H-section.
Furthermore, to mitigate damages caused by earthquake, energy absorbing devices have an important role. Here the inelastic seismic response of steel dampers called shear panel hysteresis damper and circular pipe damper have been studied analytically. The analysis result were verified by comparing with the loading test results.
- Alternative Title
- A Study on Nonlinear Inelastic Buckling and Response Behavior of Steel Members Under Axial Loading
- Alternative Author(s)
- Abebe Daniel Yeshewawork
- Department
- 일반대학원 건축공학과
- Advisor
- 최재혁
- Awarded Date
- 2013-02
- Table Of Contents
- ABSTRACT
CHAPTER 1 INTRODUCTION
1.1 General Over view 1
1.1.1 Causes of Progressive Collapse 3
1.1.2 Conditions of Progressive Collapse of Building Structures 3
1.2 Elastic and Inelastic Buckling Characteristics of Steel 5
1.3 Objectives and Scope 6
1.4 Reading Directions 6
CHAPTER 2 INELASTIC BUCKLING EVALUATION OF H-SHAPE PINNED-PINNED STEEL COLUMN MEMBER UNDER AXIAL COMPRESSION LOADING
2.1 Introduction 10
2.2 Theoretically Derived Equations 11
2.2.1 Bazant’s Hinge-ended Model 11
2.2.2 AIJ Recommendation 12
2.2.3 Paris’s Analysis 16
2.3 Finite Element Analysis Model 18
2.3.1 Material Modeling 18
2.3.2 Constraint and Loading Condition 21
2.3.3 Analysis Process 23
2.4 Finite Element Analysis Result 23
2.4.1 Failure Mode 23
2.4.2 Equivalent plastic strain and stresses of elements 25
2.4.3 Load-deformation Curve of Analysis Result 27
2.5 Compression Test Process 29
2.6 Test Result 31
2.6.1 Deformation Mode 31
2.6.2 Load-deformation Relationships 32
2.7 Comparison of Analysis and Test Results 34
2.7.1 Deformation Mode 34
2.7.2 Load-Deformation 36
2.7.3 Energy Absorption 38
2.8 Summary 40
CHAPTER 3 INELASTIC BUCKLING EVALUATION OF H-SHAPE FIXED-FIXED STEEL COLUMN MEMBER
3.1 Theoretical Investigation Buckling Behavior 41
3.2 Finite Element Analysis Model 43
3.2.1 Material Modeling 43
3.2.2 Constraint and Loading Condition 45
3.3 Result and Discussion 47
3.3.1 Failure Mode 47
3.3.2 Equivalent Plastic Strain 51
3.3.3 Load-displacement and Energy Absorption Curve Result 55
3.4. Summary 60
CHAPTER 4 INELASTIC RESPONSE OF H-SECTION AND CHS STEEL BRACING MEMBER UNDER CYCLIC LOADING
4.1 Introduction 62
4.2 Literature Review on Bracing System 63
4.3 Non-linear Inelastic Buckling 68
4.3.1 Non-linear FE Analysis 68
4.3.1.1 Material Model 68
4.3.1.2 The Constraint and Loading Condition 70
4.3.1.2.1 The Constraint 70
4.3.1.2.2 Loading Condition 70
4.3.2 Theoretical Investigations 71
4.4 Analysis Result 73
4.4.1 Buckling Mode of CHS Bracing Member 73
4.4.2 Axial Load-Axial Displacement Relationship for CHS 76
4.4.3 Buckling Mode of H-Section Bracing Member 79
4.4.4 Axial Load-Axial Displacement Relationship for H-Section 80
4.5 Lateral Brace Deformation 82
4.6 Summary 84
CHAPTER 5 CONCLUSION 85
REFERENCES 87
Appendix 92
Appendix A INELASTIC RESPONSE OF SHEAR PANEL HYSTERESIS STEEL DAMPER
A.1 Introduction 92
A.1.1 Material Properties of Specimen 93
A.2 Finite Element Analysis Model 94
A.2.1 Material Modeling 94
A.2.2 Constraint and Loading Condition 96
A.3 Verification and Validation of Analysis Model 97
A.3.1 The Test Program and Process 98
A.4 Comparison of the Results 99
A.4.1 Failure Mode 99
A.4.2 Comparison of Analysis and Test Result Hysteresis Curves 105
A.5 Inelastic Response of Shear Panel Damper 107
A.6 Cumulative Energy Dissipation 110
A.7 Summary 111
Appendix B INELASTIC RESPONSE OF CIRCULAR PIPE STEEL DAMPER
B.1 Introduction 112
B.2 Properties of Specimen 113
B.2.1 Chemical Composition 113
B.2.2 Mechanical Properties 113
B.3 Theoretical Equations 114
B.4 Non-linear FEM Analysis 120
B.4.1 Material Mode 120
B.4.2 Loading and Constraint Condition 121
B.5 Experimental Process 122
B.6 Results and Discussions 124
B.6.1 Deformation Shape 124
B.6.2 Hysteresis Curve 126
B.7 Summary 128
Appendix C IMPERFECTION IN MODELLING STEEL MEMBERS
C.1 Introduction 129
C.2 Imperfection in Column Member 129
C.3. Nonlinearity in FEA 131
- Degree
- Master
- Publisher
- 조선대학교 대학원
- Citation
- 아베베다니엘에쉬와웍. (2012). 축하중을 받는 철골부재의 비탄성좌굴 및 응답거동에 관한 연구.
- Type
- Dissertation
- URI
- https://oak.chosun.ac.kr/handle/2020.oak/9790
http://chosun.dcollection.net/common/orgView/200000263833
- Appears in Collections:
- General Graduate School > 3. Theses(Master)
- Files in This Item:
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축하중을 받는 철골부재의 비탄성좌굴 및 응답거동에 관한 연구.pdf
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