1 General Provisions
1.0.1 This specification is formulated with a view to normalizing the design, fabrication, installation and acceptance of low-rise cold-formed thin-walled steel buildings and achieving advanced technology, economy and rationality, safety and serviceability as well as ensuring quality.
1.0.2 This specification is applicable design, construction and acceptance of low-rise buildings with cold-formed thin-walled steel as main load bearing members, storey number not greater than 3 and cornice height not greater than 12m.
1.0.3 This specification is formulated according to the principles specified in current national standards Unified Standard Reliability Design of Building Structures (GB 50068), Building Constructions - Specifications for Loads of Architectural Structures (GB 50009), Code for Seismic Design of Buildings (GB 50011), Code for Design of Steel Structures (GB 50017), Technical Code of Cold-formed Thin-wall Steel Structures (GB 50018) and Code for Acceptance of Construction Quality of Steel Structures (GB 50205) and in combination with the characteristics of low-rise cold-formed thin-walled steel buildings.
1.0.4 When designing low-rise cold-formed thin-walled steel buildings, the materials, structure scheme and structure measures shall be selected reasonably to ensure the structure meets strength, stability and stiffness requirements as well as fire prevention and anticorrosion requirements.
1.0.5 Design, construction and acceptance of low-rise cold-formed thin-walled steel buildings shall not only comply with this specification, but also comply with those in the current relevant ones of the nation.
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2 Terms and Symbols
2.1 Terms
2.1.1 Web stiffener
Component connected with web plate to prevent web buckling.
2.1.2 Blocking
Member connected with structural member, transferring lateral force out of structural member plane and providing lateral supporting point for supported member.
2.1.3 Built-up member
I-shaped or box-shaped member composed of groove-shaped or curling groove-shaped members through connection.
2.1.4 Clip angle
Members use for connection between members and generally bent to 90°.
2.1.5 Eave overhang
Horizontal distance from structure scarfskin of outer wall to roof structure scarfskin.
2.1.6 Flat strap
Sheet strap made of steel plate through being cut into certain width, which may be used for brace supporting something else or member transferring tension.
2.1.7 Floor joist
Horizontal member supporting floor load.
2.1.8 Header
Horizontal member at wall or roof opening which mainly transfers vertical load to adjacent vertical load-bearing member.
2.1.9 Wall stud
Vertical load-bearing member composing wall unit.
2.1.10 Rafter
Roof member arranged in an inclined way according to the roof slope for supporting roof load.
2.1.11 Gable overhang
Horizon distance from gable structure scarfskin to roof structure scarfskin.
2.1.12 Stressed skin action
Capacity of structural sheathing system, which is reliably connected with supporting member, for resisting shear deformation in itself plane.
2.1.13 Structural sheathing
Sheathing directly installed on wall stud or beam and used for transferring load and supporting wall (beam).
2.1.14 Track
Groove-shaped member arranged at wall top or bottom as well as floor system surrounding.
2.1.15 Wall framing
Combined member formed by wall stud, track, sheathing, support, brace or blocking through connecting pieces, which is used to bear vertical or horizontal load.
2.1.16 Bearing wall
Wall bearing vertical external load.
2.1.17 Shear wall
Wall bearing horizontal load in plane.
2.1.18 Non-bearing wall
Wall not bearing vertical external load.
2.1.19 Thickness of steel plate
Sum of basal steel plate thickness and plating thickness.
2.2 Symbols
Contents
Foreword i
1 General Provisions
2 Terms and Symbols
2.1 Terms
2.2 Symbols
3 Materials and Design Indexes
3.1 Material Selection
3.2 Design Indexes
4 Basic Design Requirements
4.1 Design Principles
4.2 Loads and Actions
4.3 Architectural Design and Structural Layout
4.4 Allowable Value for Deformation of Structures and Structural Members
4.5 General Requirements for Detailing
5 Structural Analysis
5.1 Calculation Principles of Structures
5.2 Analysis of Horizontal Load Effects
6 Calculation of Members and Connections
6.1 Calculation of Members
6.2 Calculation and Detailing of Connections
7 Floor Systems
7.1 General Requirements
7.2 Detailing of Floor Systems
8 Wall Framing Systems
8.1 General Requirements
8.2 Calculation of Wall Framings
8.3 Requirements for Detailing
9 Roof Systems
9.1 General Requirements
9.2 Calculation of Roof Systems
9.3 Requirements for Detailing of Roof Joints
10 Fabrication, Coating, Erection and Acceptance
10.1 Fabrication
10.2 Coating Works of Anti-corrosion
10.3 Erection
10.4 Final Acceptance
11 Heat Preservation, Insulation and Damp Proof
11.1 General Requirements
11.2 Detailing of Heat Preservation and Insulation
11.3 Detailing of Damp Proof
12 Fireproofing
13 Testing
13.1 General Requirements
13.2 Performance Testing
Appendix A Test Method on Design Shear Strength of Screws
Appendix B Test Method on Shear Strength of Wall Framings
Appendix C Calculation on Distortional Buckling Stress of Members
Explanation of Wording in This Specification
List of Quoted Standards
