Structural analysis of concrete-filled double steel tubes

1 Introductions
1£®1 Principles of Concrete-Filled Steel Tube £¨CFST£©
1£®2 Applications and Developments of CFST
1£®3 Researches on CFST
1£®4 Connections in CFST Structures
1£®4£®1 Through-Beam Joint and Through-Column Joint
1£®4£®2 Exterior Stiffening Ring Joint (External Diaphragm Joint£©
1£®4£®3 Diaphragm-Through Joint
1£®4£®4 Vertical Stiffener Joint
1£®4£®5 Welded Haunch Joint
1£®4£®6 Anchored T-Plate Joint
1£®4£®7 Bolted Joint
1£®5 Reinforced CFSTs
1£®5£®1 I£º CFST Reinforced by Inner Steel Tube (Including CFDST£©
1£®5£®2 H£º CFST Reinforced by Inner Section Steel
1£®5£®3 III£º CFRP-Confined CFST
1£®5£®4 IV£º Hollow CFDST
1£®5£®5 Applications of CFDST
1£®6 Monograph Organization
References

2 Analysis of Axial Bearing Capacity
2£®1 Tests and Phenomena
2£®2 Calculation by Limit Equilibrium Method
2£®2£®1 Limit Equilibrium Method
2£®2£®2 Unified Strength Theory
2£®2£®3 Elastoplastic Limit Analysis
2£®3 Calculation by Unified Theory of CFST
2£®3£®1 Method of Unified Theory of CFST
2£®3£®2 Equivalent Confinement Coefficient
2£®3£®3 Calculation Formulas
2£®4 Validation and Analysis
2£®5 Parametric Study for CFDST Column
2£®5£®1 Influence of Inner Tube
2£®5£®2 A Simple Model Used in Optimum Design
2£®5£®3 Contribution of Inner Tube
2£®6 Summary
References

3 Compressive Stiffness of CFDST Columns
3£®1 Compressive Stiffness of CFST
3£®2 Simple Superposition Method
3£®3 Calculation by Unified Theory of CFST
3£®4 Elasticity Solutions
3£®4£®1 Basic Model
3£®4£®2 Energy Theory
3£®5 Verification of Theoretical Calculations
3£®5£®1 Comparison with Experimental Results
3£®5£®2 Parametric Study
3£®6 Summary
References

4 Frame Joint Forms in CFDST Structures
4£®1 Ring-Beam Joint with Discontinuous Outer Tube
4£®2 External Diaphragm Joint
4£®3 Vertical Stiffener Joint
4£®4 Anchored Steel Beam Joint
4£®5 High Strength Bolts-T-Plate Joint
4£®6 Summary
References
5 Ring Beam Joints to RC Beams
5£®1 Description of Connection System
5£®2 Test Specimens and Material Properties
5£®3 Test Setup and Measurement Scheme
5£®4 Discussion of Test Results
5£®4£®1 Failure Modes
5£®4£®2 P-A Hysteresis Loops
5£®4£®3 Analysis of Ductility
5£®4£®4 Load-Strain Curves
5£®5 FE Modeling
5£®5£®1 Comparison between Test and FEM Results
5£®5£®2 Parametric Studies
5£®6 Summary
References

6 Vertical Stiffener Joints to Steel Beams
6£®1 Structure Forms and Features of the Connection
6£®2 Test Specimens and Material Properties
6£®3 Test Setup and Measurements
6£®4 Discussion of Test Results
6£®4£®1 Failure Modes
6£®4£®2 P-A Hysteresis Loops
6£®4£®3 Parametric Analysis
6£®4£®4 Analysis of Ductility
6£®4£®5 Degradation
6£®4£®6 Energy Dissipation
6£®5 Finite Element Modeling
6£®5£®1 Establishment of Finite Element Model
6£®5£®2 Analysis of Loading Process
6£®5£®3 Verification of Finite Element Modeling
6£®6 Calculation of Bearing Capacity
6£®6£®1 Shear Force Transfer Model and Shear Resistance in Panel Zone
6£®6£®2 Moment Transfer Model and Bending Resistance
6£®6£®3 Validation and Analysis
6£®6£®4 Discussions
6£®7 Summary
References

7 External Diaphragm Joints to Steel Beams
7£®1 Description of the Connection System
7£®1£®1 Design of New External Diaphragm Joints
7£®1£®2 Fabrication of Specimens
7£®2 Material Properties and Test Procedures
7£®2£®1 Material Properties
7£®2£®2 Test Apparatus and Procedures
7£®3 Experimental Observations and Failure Modes
7£®3£®1 Beam Failure Mode
7£®3£®2 Column Failure Mode
7£®4 Test Results and Discussion
7£®4£®1 Hysteresis Loops
7£®4£®2 Analysis of Ductility
7£®4£®3 Effects of Different Test Parameters
7£®4£®4 Stiffness Degradation
7£®4£®5 Energy Dissipation
7£®5 Data Analysis Based on DSCM
7£®5£®1 DSCM and Measurement Setup
7£®5£®2 Data Processing
7£®5£®3 Joint Stiffness Analysis
7£®5£®4 Relationship of Shear Force-Deformation in Panel Zone (V-y£©
7£®5£®5 Strain Nephogram in Panel Zone
7£®6 Summary
References

8 Anchored Web Joints with Haunches
8£®1 Test Overview
8£®1£®1 Specimens Design
8£®1£®2 Materiai Properties
8£®1£®3 Test Device and Loading System
8£®1£®4 Arrangement of Measuring Points
8£®2 Numerical Analysis Model
8£®2£®1 Constitutive Model
8£®2£®2 Element Selection and Division
8£®2£®3 Interactions£¬ Boundary Conditions and Loading Modes
8£®3 Comparison Between Test and Numerical Simulation Results
8£®3£®1 Destruction Process
8£®3£®2 Strain and Stress Responses
8£®3£®3 Hysteresis Loops
8£®3£®4 Joint Energy Dissipation Capacity
8£®4 Parametric Analysis
8£®4£®1 Influence of Joint Construction
8£®4£®2 Influence of Steel Beam Strength
8£®4£®3 Influence of Beam-to-Column Linear Bending Stiffness Ratio (K£©
8£®4£®4 Influence of Concrete Strength
8£®4£®5 Influence of Axial Compression Ratio
8£®5 Summary
References

9 Blind Bolted T-Plate Joints in Prefabricated Construction
9£®1 Specimens Design
9£®2 Material Properties
9£®3 Test Setup and Loading Scheme
9£®3£®1 Test Setup
9£®3£®2 Arrangement of Measurement Points £®£®
9£®4 Test Process and Phenomena
9£®4£®1 Failure Process
9£®4£®2 Hysteresis Loops and Energy Dissipation Capacity
9£®4£®3 P-A Skeleton Curves
9£®4£®4 Bearing Capacity and Ductility
9£®4£®5 Strain Responses of Inner Steel Tubes
9£®5 Finite Element Modeling
9£®5£®1 Establishment of Finite Element Model
9£®5£®2 Simulation of Failure Modes
9£®5£®3 Comparison of Ultimate Bending Capacity Between Test and FEA Results
9£®5£®4 Stress Responses of Steel Tubes and Bolts
9£®6 Calculation of Ultimate Bending Capacity
9£®6£®1 Establishment of a Tensile T-Plate Model
9£®6£®2 Working Mechanism of Stiffening Ribs
9£®6£®3 Verification by Test Data and Numerical Results
9£®6£®4 Analysis of Parameter Influence
9£®7 Summary
References

10 Conclusions and Prospects
10£®1 Conclusions
10£®2 Prospects