1 General Provisions
1.0.1 This code is prepared with a view to applying the steel and concrete composite structure in construction engineering appropriately and attaining safety and usability, technical advancement, economic rationality and construction convenience.
1.0.2 This code is applicable to the design of steel and concrete composite structures for tall buildings, multi-storey buildings and general buildings in non-seismic region and seismic region with seismic fortification intensity of 6 to 9.
1.0.3 In addition to the requirements stipulated in this code, the design of composite structure shall comply with those stipulated in the current relevant standards of the nation.
2 Terms and Symbols
2.1 Terms
2.1.1 composite structure members
the structural members formed by the composite of steel, steel tube or steel plate with reinforced concrete and capable of bearing force as a whole
2.1.2 composite structures
structures composed of composite structure members and structures composed of composite structure members, steel members and reinforced concrete members
2.1.3 steel reinforced concrete frame beams
frame beams configured with steel in their reinforced concrete sections
2.1.4 steel reinforced concrete transfer beams
steel reinforced concrete beams supporting wall or column of the upper storey and realizing the structure form change or structure arrangement change from the upper storey to the lower storey; the transfer beam of partial frame-supported shear wall structures is also known as frame-supported beam
2.1.5 steel reinforced concrete frame columns
frame columns configured with steel in their reinforced concrete sections
2.1.6 concrete-filled rectangular steel tube frame columns
frame columns bearing force by steel tubes and concrete jointly after filling concrete in rectangle steel tubes
2.1.7 concrete-filled circular steel tube frame columns
frame columns bearing force by steel tubes and concrete jointly after filling concrete in circular steel tubes
2.1.8 transfer columns
columns supporting wall or column of the upper storey and realizing the structure form change or structure arrangement change from the upper storey to the lower storey
2.1.9 steel concrete composite shear walls
shear walls configured with solid-web steel in the edge member of reinforced concrete shear wall
2.1.10 steel plate concrete composite shear walls
shear walls configured with steel plate in reinforced concrete section and around reinforced concrete
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3 Materials
3.1 Steel
3.1.1 For the steels in composite structure members, Q345, Q390 and Q420 high strength low alloy structural steels and Q235 carbon structural steel, with quality grade of Grade B or higher, should be adopted and shall meet the requirements of the current national standards GB/T 1591 High Strength Low Alloy Structural Steels and GB/T 700 Carbon Structural Steels respectively. Where thicker steel plates are adopted, steel plates of various designations complying with the relevant requirements of the current national standard GB/T 19879 Steel Plates for Building Structure may be adopted and their quality grade should not be lower than Grade B. Where steels of other designations are adopted, they shall also meet those specified in the current relevant standards of the nation.
3.1.2 Steels shall be provided with qualification guarantees on yield strength, tensile strength, elongation, impact toughness and sulfur and phosphorus content; for welded structure, the qualification guarantees on carbon content and cold bend test shall also be provided.
3.1.3 Killed steel should be adopted.
3.1.4 For steel plate, its thickness shall be greater than or equal to 40mm and it shall bear the welding connection plate along the plate thickness direction; the cross section reduction ratio in steel plate thickness direction shall not be less than the permissible value of Grade Z15 specified in the current national standard GB/T 5313 Steel Plate with Through-thickness Characteristics.
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3 Materials
3.1 Steel
3.1.1 For the steels in composite structure members, Q345, Q390 and Q420 high strength low alloy structural steels and Q235 carbon structural steel, with quality grade of Grade B or higher, should be adopted and shall meet the requirements of the current national standards GB/T 1591 High Strength Low Alloy Structural Steels and GB/T 700 Carbon Structural Steels respectively. Where thicker steel plates are adopted, steel plates of various designations complying with the relevant requirements of the current national standard GB/T 19879 Steel Plates for Building Structure may be adopted and their quality grade should not be lower than Grade B. Where steels of other designations are adopted, they shall also meet those specified in the current relevant standards of the nation.
3.1.2 Steels shall be provided with qualification guarantees on yield strength, tensile strength, elongation, impact toughness and sulfur and phosphorus content; for welded structure, the qualification guarantees on carbon content and cold bend test shall also be provided.
3.1.3 Killed steel should be adopted.
3.1.4 For steel plate, its thickness shall be greater than or equal to 40mm and it shall bear the welding connection plate along the plate thickness direction; the cross section reduction ratio in steel plate thickness direction shall not be less than the permissible value of Grade Z15 specified in the current national standard GB/T 5313 Steel Plate with Through-thickness Characteristics.
3.1.5 The steels of composite structure members for which the seismic action shall be considered shall meet those specified in Article 3.9.2 of GB 50011-2010 Code for Seismic Design of Buildings.
1 General Provisions
2 Terms and Symbols
2.1 Terms
2.2 Symbols
3 Materials
3.1 Steel
3.2 Reinforcement
3.3 Concrete
4 Basic Requirements of Structural Design
4.1 General Requirements
4.2 Structure System and Configurations
4.3 Design and Calculation Principle
4.4 General Detailing
5 Steel Reinforced Concrete Frame Beams and Transfer Beams
5.1 General Requirements
5.2 Bearing Capacity Calculation
5.3 Crack Width Checking
5.4 Deflection Checking
5.5 Detailing Requirements
6 Steel Reinforced Concrete Frame Columns and Transfer Columns
6.1 General Requirements
6.2 Bearing Capacity Calculation
6.3 Crack Width Checking
6.4 Detailing Requirements
6.5 Column Base Design and Detailings
6.6 Beam-column Joint Calculation and Detailings
7 Concrete-filled Rectangular Steel Tube Frame Columns and Transfer Columns
7.1 General Requirements
7.2 Bearing Capacity Calculation
7.3 Detailing Requirements
7.4 Column Base Design and Detailings
7.5 Beam-column Joint Calculation and Detailings
8 Concrete-filled Circular Steel Tube Frame Columns and Transfer Columns
8.1 General Requirements
8.2 Bearing Capacity Calculation
8.3 Detailing Requirements
8.4 Column Base Design and Detailings
8.5 Beam-column Joints Types and Detailings
9 Steel Concrete Composite Shear Walls
9.1 Bearing Capacity Calculation
9.2 Detailing Requirements
10 Steel Plate Concrete Composite Shear Walls
10.1 Bearing Capacity Calculation
10.2 Detailing Requirements
11 Steel Concealed Bracing Concrete Composite Shear Walls
11.1 Bearing Capacity Calculation
11.2 Detailing Requirements
12 Steel and Concrete Composite Beams
12.1 General Requirements
12.2 Bearing Capacity Calculation
12.3 Calculation of Deflection and Crack Width at Hogging Moment Zone
12.4 Detailing Requirements
13 Composite Slab
13.1 General Requirements
13.2 Bearing Capacity Calculation
13.3 Checking at Serviceability Limit State
13.4 Detailing Requirements
13.5 Construction Phase Checking and Requirements
14 Detailing of Connections
14.1 Detailing of Connections of Steel Reinforced Concrete Column
14.2 Detailing of Connections of Concrete-filled Rectangular Steel Tube Column
14.3 Detailing of Connections of Concrete-filled Circular Steel Tube Column
14.4 Beam-beam Connections
14.5 Beam-wall Connections
14.6 Brace-column-beam Connections
14.7 Detailings of Shear Connector
14.8 Detailing of Connections between Reinforcement and Steel Member
Annex A Shear and Bond Factors and Standard Test Method for Common Composite Slab with Profiled Steel Plates
Annex B Composite Floor Comfort Checking
Explanation of Wording in This Code
List of Quoted Standards
