GB 50755-2012 English PDF (GB50755-2012)

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GB 50755-2012: Code for construction of steel structures
GB 50755-2012
NATIONAL STANDARD OF THE
PEOPLE’S REPUBLIC OF CHINA
UDC
P GB 50755-2012
Code for Construction of Steel Structures
ISSUED ON: JANUARY 21, 2012
IMPLEMENTED ON: AUGUST 1, 2012
Issued by: Ministry of Housing and Urban-Rural Development of PRC;
General Administration of Quality Supervision, Inspection and
Quarantine of the People's Republic of China.
Table of Contents
Foreword ... 4
1 General Provisions ... 9
2 Terms and Symbols ... 10
2.1 Terms ... 10
2.2 Symbols ... 11
3 Basic Requirements ... 13
4 Design of Construction Stage ... 15
4.1 General Requirements ... 15
4.2 Structure Analysis of Construction Stage ... 16
4.3 Preset Deformation of Structure ... 17
4.4 Detail Design ... 17
5 Materials ... 18
5.1 General Requirements ... 18
5.2 Steel Materials ... 18
5.3 Welding Materials ... 21
5.4 Fasteners for Connections ... 22
5.5 Steel Castings, Anchorages and Pins ... 23
5.6 Coating Materials ... 23
5.7 Material Storage ... 24
6 Welding ... 26
6.1 General Requirements ... 26
6.2 Welding Personnel ... 26
6.3 Welding Procedure ... 26
6.4 Welded Joints ... 31
6.5 Welding Quality Inspection ... 34
6.6 Repair of Welding Defects ... 34
7 Connecting of Fasteners ... 36
7.1 General Requirements ... 36
7.2 Preparation of Connecting Pieces and Friction Surface Treatment ... 36
7.3 Connection of Ordinary Fasteners ... 37
7.4 Connection of High Strength Bolts ... 39
8 Processing of Steel Parts and Components ... 45
8.1 General Requirements ... 45
8.2 Setting out and Marking-off ... 45
8.3 Cutting ... 46
8.4 Rectification and Formation ... 47
8.5 Trimming of Edges ... 49
8.6 Holing ... 50
8.7 Processing of Bolted Spheres and Welded Hollow Spheres ... 51
8.8 Processing of Cast Steel Node ... 52
8.9 Processing of Rope Nodes ... 52
9 Assembling and Processing of Members ... 54
9.1 General Requirements ... 54
9.2 Assembling of Components ... 54
9.3 Assembling of Members ... 55
9.4 Milling of Member Ends ... 57
9.5 Rectification of Members ... 57
10 Test Assembling of Steel Structures ... 58
10.1 General Requirements ... 58
10.2 Test Assembling of Steel Structures ... 58
10.3 Test Assembling of Computer Assistance Simulation ... 59
11 Installation of Steel Structures ... 60
11.1 General Requirements ... 60
11.2 Hoisting Equipment and Hoisting Mechanism ... 61
11.3 Foundation, Bearing Surface and Embedment Parts ... 62
11.4 Installation of Members ... 63
11.5 Single-story Steel Structures ... 65
11.6 Multi-story and Tall Steel Structures ... 66
11.7 Long-span Spatial Steel Structures ... 67
11.8 High-rising Steel Structures ... 68
12 Profiled Metal Plate ... 70
13 Coating ... 72
13.1 General Requirements ... 72
13.2 Surface Treatment ... 73
13.3 Coating of Anticorrosive Paint Layer ... 73
13.4 Metal Hot Spraying ... 75
13.5 Anticorrosion of Hot Dipping Galvanizing ... 76
13.6 Coating of Fire-retardant Coating Layer ... 76
14 Construction Survey ... 78
14.1 General Requirements ... 78
14.2 Plan Control Network Survey ... 78
14.3 Elevation Control Network Survey ... 79
14.4 Survey of Single-story Steel Structures ... 79
14.5 Survey of Multi-story and Tall Steel Structures ... 80
14.6 Survey of High-rising Steel Structures ... 81
15 Construction Monitoring ... 83
15.1 General Requirements ... 83
15.2 Construction Monitoring ... 83
16 Construction Safety and Environmental Protection ... 86
16.1 General Requirements ... 86
16.2 Climb Up ... 86
16.3 Safety Channel ... 87
16.4 Protection of Portals and Sides ... 87
16.5 Construction Machinery and Equipment ... 87
16.6 Safety of Site Hoisting Area ... 88
16.7 Fire Safety Measures ... 88
16.8 Environmental Protection Measures ... 89
Explanation of Wording in This Code ... 90
List of Quoted Standards ... 91
1 General Provisions
1.0.1 This Code is formulated with a view to implementing the national technical
and economic policies in the construction of steel structures and achieving
safety and usability, guaranteed quality, advanced technology, and economy
and rationality.
1.0.2 This Code is applicable to construction of steel structures in industrial and
civil buildings and structures.
1.0.3 The construction of steel structures shall be carried out according to those
specified in this Code and quality acceptance shall be carried out for it
according to the current national standards of "Unified Standard for
Constructional Quality Acceptance of Building Engineering" (GB 50300) and
"Code for Acceptance of Construction Quality of Steel Structures" (GB 50205).
1.0.4 The construction of steel structures shall not only meet the requirements
of this Code, but also comply with those in the current relevant standards of the
nation.
2 Terms and Symbols
2.1 Terms
2.1.1 Design document
A general term for such technical documents as design drawing, design
instruction and design change completed by the design organization.
2.1.2 Design drawing
The technical drawing prepared by the design organization as the engineering
construction basis.
2.1.3 Detail drawing for construction
The detailed technical drawing drawn according to the technical requirements
of the steel structure design drawing and construction processes for direct
guidance on fabrication and installation of steel structures.
2.1.4 Temporary structure
The structure that is erected during the construction period and required to be
removed at the end of the construction.
2.1.5 Temporary measure
Some necessary structures or temporary parts and member bars, such as lifting
hole, connecting plate and auxiliary member that are arranged with a view to
meeting the construction demands and guaranteeing engineering safety during
the construction period.
2.1.6 Space rigid unit
The basically-stable space system that is composed of members.
2.1.7 Welded hollow spherical node
The node of the pipe that is directly welded to the sphere.
2.1.8 Bolted spherical node
The node that connects the pipe and sphere via -bolts and is composed of parts
and components such as the bolted sphere, high strength bolts, sleeve,
fastening screw and conical head or closing plate.
2.1.9 Mean slip coefficient
3 Basic Requirements
3.0.1 The construction organization of steel structures shall have corresponding
construction qualification as well as safety, quality and environmental
management system.
3.0.2 Before the construction of the steel structures, technical documents such
as construction organization design and its supporting specific construction
plan approved by the technical principal of the construction organization shall
be provided and submitted to the supervision engineer or the Owner's
representative according to the relevant requirements; experts shall be
organized to review the technical plan and safety emergency plan for the
construction of important steel structures.
3.0.3 In the technical documents and technical contract documents with regard
to the construction of steel structures, the construction quality shall at least
meet the relevant requirements of the current national standard "Code for
Acceptance of Construction Quality of Steel Structures" (GB 50205).
3.0.4 Fabrication and installation of steel structures shall meet the requirements
of the design drawing. The construction organization shal...