| ABSTRACT | 第4-5页 |
| 摘要 | 第6-9页 |
| CHAPTER 1 INTRODUCTION | 第9-28页 |
| 1.1 Background | 第9-16页 |
| 1.1.1 The Characteristics and Development of Concrete filled steel tubes (CFST) | 第9-14页 |
| 1.1.2 Special-shaped CFST columns | 第14-15页 |
| 1.1.3 Advantages of special-shaped CFST columns | 第15-16页 |
| 1.2 Literature review | 第16-26页 |
| 1.2.1 Research status of circular CFST columns | 第16-19页 |
| 1.2.2 Research status of square and rectangle CFST columns | 第19-21页 |
| 1.2.3 Research status of special-shaped CFST columns | 第21-26页 |
| 1.3 Aim and Objectives | 第26页 |
| 1.4 Methodology | 第26-27页 |
| 1.5 Dissertation Structure | 第27-28页 |
| CHAPTER 2 EXPERIMENTAL STUDY OF CROSS-SHAPED CFST COLUMN SUBJECTED TO AXIAL COMPRESSION | 第28-49页 |
| 2.1 Introduction | 第28-29页 |
| 2.2 Design and fabrication of test specimens | 第29-35页 |
| 2.2.1 Design of specimens | 第29-31页 |
| 2.2.2 Fabrication of specimens | 第31-33页 |
| 2.2.3 Material properties | 第33-35页 |
| 2.3 Experimental setup | 第35-39页 |
| 2.3.1 Installation of strain gauges and displacement transducers | 第35-39页 |
| 2.3.2 Loading schedule | 第39页 |
| 2.4 Experimental phenomena | 第39-44页 |
| 2.4.1 Stub columns subjected to axial load | 第39-43页 |
| 2.4.2 Slender columns subjected to axial load | 第43-44页 |
| 2.5 Analysis and Discussion of experimental results | 第44-48页 |
| 2.5.1 Comparison of experimental results | 第44-48页 |
| 2.6 Summary and conclusion | 第48-49页 |
| CHAPTER 3 DEVELOPMENT AND VALIDATION OF CROSS-SHAPED CFST COLUMN MODEL | 第49-60页 |
| 3.1 Introduction | 第49-50页 |
| 3.2 Finite element modeling | 第50-56页 |
| 3.2.1 Finite element type and mesh | 第50-51页 |
| 3.2.2 Boundary conditions and load application | 第51页 |
| 3.2.3 Steel-Concrete Interaction | 第51-52页 |
| 3.2.4 Initial imperfections | 第52页 |
| 3.2.5 Constitutive models | 第52-56页 |
| 3.3 Validation of FE model validation using experimental data | 第56-59页 |
| 3.3.1 Comparison of failure modes | 第56-57页 |
| 3.3.2. Comparison of axial load – axial shortening response curves | 第57-59页 |
| 3.4 Summary and conclusion | 第59-60页 |
| CHAPTER 4 PARAMETRIC ANALYSIS OF MECHANICAL PROPERTIES OF CROSS-SHAPED CFST STUB COLUMN | 第60-72页 |
| 4.1 Introduction | 第60-61页 |
| 4.2 Design of Parametric Study | 第61-66页 |
| 4.2.1 Width-to-thickness ratio | 第64页 |
| 4.2.2 Steel tube Strength | 第64-65页 |
| 4.2.3 Concrete compressive strength | 第65-66页 |
| 4.3 Typical analysis | 第66-67页 |
| 4.4 Calculation of ultimate strength | 第67-71页 |
| 4.4.1 Primary methods in current codes and specifications | 第67-68页 |
| 4.4.2 Theoretical model | 第68-71页 |
| 4.5 Summary and conclusion | 第71-72页 |
| CONCLUSIONS AND RECOMMENDATIONS | 第72-74页 |
| REFERENCES | 第74-81页 |
| ACKNOWLEDGEMENT | 第81页 |
