1 General Provisions
1.0.1 This code is formulated with view to implementing the national technical and economic policies in the design, member manufacturing and project construction of concrete filled steel tubular structures and realizing safety, applicability and economy.
1.0.2 This code is applicable to the design, member manufacturing and construction of industrial and civil buildings and general structures of concrete filled steel tubular structures.
1.0.3 The design, member manufacturing and construction of concrete filled steel tubular structures shall not only meet the requirements stipulated in this code, but also comply with those in the current relevant national standards.
2 Terms and Symbols
2.1 Terms
2.1.1 Concrete filled steel tubular members
Members with steel tubes filled with concrete, including solid and hollow concrete filled steel tubular members. Their sections may be circular, rectangle and polygonal; hereinafter referred to as CFST members.
2.1.2 Concrete filled steel tubular structures
Structures with concrete filled steel tubular members as the primary load-carrying members, hereinafter referred to as CFST structures.
2.1.3 Solid concrete filled steel tubular members
Members with steel tube filled up with concrete, hereinafter referred to as S-CFST members.
2.1.4 Hollow concrete filled steel tubular members
Hollow concrete filled steel tubular members made through centrifugation method by injecting a certain amount of concrete into the empty steel tubes, hereinafter referred to as H-CFST members.
2.1.5 Steel ratio
The ratio of steel tube area to concrete area on the member section.
2.1.6 Hollow ratio
The ratio of the area of hollow part to the total area of concrete and hollow part on the section of hollow concrete filled steel tubular member.
2.1.7 Confinement coefficient
The ratio of the product of steel tube area and design steel strength to that of the concrete area and design concrete strength on the member section.
2.1.8 Sea sand concrete filled steel tubular members
Concrete filled steel tubular members manufactured with sea sand concrete.
2.1.9 Recycled concrete filled steel tubular members
Concrete filled steel tubular members manufactured with recycled aggregate concrete.
2.2 Symbols
2.2.1 Action, action effect and resistance
N - the design value of axial pressure;
Nt - the design value of axial tension;
Contents
Foreword I
1 General Provisions
2 Terms and Symbols
2.1 Terms
2.2 Symbols
3 Materials
3.1 Steel
3.2 Concrete
3.3 Connecting Materials
4 Basic Requirements
4.1 General Requirements
4.2 Structural Analysis and Design Principle
4.3 S-CFST Structure
4.4 Hollow-CFST Structure
5 Design of Load-carrying Capacities for Circular and Polygonal CFST Members
5.1 Load-carrying Capacities and Rigidity Calculations of Single CFST Columns under Single Stress Condition
5.2 Load-carrying Capacity Calculation of Latticed CFST Member under Single Stress Condition
5.3 Load-carrying Capacity Calculation of CFST Members under Complex Stress Conditions
5.4 Effects of Concrete Creep on Load-carrying Capacity of Member
6 Design of Load-carrying Capacities for Solid Circular CFST Members
6.1 Load-carrying Capacity Calculation of Single Axial Loaded Column
6.2 Calculation of Horizontal Shear Capacity for Single Column
6.3 Calculation of Local Compression
6.4 Load-carrying Capacity Calculation of CFST Latticed Column
7 Design of Connection and Joints
7.1 General Requirements
7.2 Solid-CFST Members Connections and Joints
7.3 Hollow-CFST Members Connections and Joints
7.4 Column Base Joint
8 Fireproofing Design
9 Manufacture and Construction
9.1 Manufacture of Steel Tube
9.2 Rust Removal and Preservative Coating of CFST Members
9.3 Concrete Pouring and Construction of S-CFST Members
9.4 Manufacture of Hollow-CFST Members
9.5 Construction of CFST Structures
Appendix A Shape Constants for Various Sections
Appendix B Design Values for Compressive Strength of CFST Members
Appendix C Joint Design of Steel Beam with CFST Column by Outside Stiffener Rings
Appendix D RC Beam to Circular CFST Column Ring-beam Joints Calculation Methods
Appendix E CFST Members Fireproofing Calculation Methods
Explanation of Wording in This Code
List of Quoted Standards
