GB 50755-2012 English PDF

GB 50755-2012: Code for Construction of Steel Structures
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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 shall carry out process
review on the design documents; where it is necessary to change the design,
consent from the original design organization shall be obtained and relevant
design change documents shall be transacted.
3.0.5 During the construction and quality acceptance of steel structures,
effective measuring instruments and tools shall be used. The construction
organizations and supervision organizations in various professions shall unify
the measurement standard.
3.0.6 Special equipment and tool for construction of steel structures shall meet
the construction requirements and shall be within the validity of the qualified
verification.
3.0.7 For the construction of steel structures, quality process control shall be
carried out according to the following requirements:
1 Site acceptance is carried out for the materials and finished products; re-
inspection is carried out for the materials and semi-finished products related to
the safety and function according to the relevant requirements; witness
sampling and sample delivery are adopted;
2 Quality control is carried out for each process according to the
requirements of the construction processes and process inspection is carried
out;
4 Design of Construction Stage
4.1 General Requirements
4.1.1 This Chapter is applicable to the design of steel structure construction
stage, including structure analysis and checking, design for the preset structure
deformation and detail drawing design.
4.1.2 During the design of construction stage, the selected design index shall
meet the relevant requirements of the design documents and the current
national standard "Code for Design of Steel Structures" (GB 50017).
4.1.3 During the structure analysis and checking at the construction stage,
loads shall meet the following requirements:
1 Dead load shall include structure self-weight and prestress and its
characteristic value shall be calculated according to actual conditions;
2 Live load during the construction shall include construction loading and
weight of operators and small tools; and its characteristic value may be
calculated according to actual conditions;
3 Wind load may be taken according to the construction site and actual
construction conditions, on the basis of at least ten-year wind pressure; the
wind load shall be calculated according to the relevant requirements of the
current national standard "Load Code for the Design of Building Structures" (GB
50009). In case of any wind load greater than the ten-year wind pressure during
the construction period, an emergency plan shall be worked out;
4 Snow load shall be taken and calculated according to the relevant
requirements of the current national standard "Load Code for the Design of
Building Structures" (GB 50009);
5 Ice load shall be taken and calculated according to the relevant
requirements of the current national standard "Code for Design of High-rising
Structures" (GB 50135);
6 Characteristic values of hoisting equipment and other equipment loads
should be taken according to the equipment instruction;
7 The temperature action should be calculated according to the
temperature difference change in the local meteorological information; the
temperature difference on the sunny side and dark side of the structure due to
sunlight should be calculated according to the relevant requirements of the
current national standard "Code for Design of High-rising Structures"(GB
50135);
bearing capacity and deformation shall be checked. When the supporting
ground is at or adjacent to the side slope, stability of the side slope shall be
checked.
4.3 Preset Deformation of Structure
4.3.1 During the normal use or in the construction stage, when any deformation
due to the deadweight and other load action exceeds the limit specified in the
design documents or current relevant standards of the nation or preset
deformation requirements are made for the major structure in the design
documents, preset deformation shall be adopted for the structure during the
construction period.
4.3.2 When the preset deformation of structure is calculated, the characteristic
value shall be taken for the load; the load effect combination shall meet the
relevant requirements of the current national standard "Load Code for the
Design of Building Structures" (GB 50009).
4.3.3 The preset deformation of structure shall be calculated through the
structure analysis and in combination with the construction process; it shall be
jointly determined by the construction organization and the original design
organization. Specific process design shall be carried out for the preset
deformation of structure.
4.4 Detail Design
4.4.1 The detail drawing for construction of steel structures shall be prepared
according to structure design documents and relevant technical documents and
shall be confirmed by the original design organization; where the connection
design is necessary, the connection design document also shall be confirmed
by the original design organization.
4.4.2 The detail design of steel structures shall meet relevant technical
requirements such as construction structures, construction process and
member transportation.
4.4.3 The detail drawing for construction of steel structures shall include
drawing list, general design description, member layout, detail drawing for the
member and connection installation etc. The drawing shall be shown clearly
and completely; for the detail drawing for construction of complex-space
member and connection/node, three dimensional diagram should be drawn.
4.4.4 The member weight shall be calculated and listed in the detail drawing for
construction of steel structures; the weight of steel plate parts should be
calculated as a rectangle and the weld weight should be calculated using 1.5 %
weight of the welded member.
current relevant product standards of the nation.
5.6.2 Zinc content of the zinc rich anti-corrosive paint shall meet the relevant
requirements of the design document and the current professional standard
"Zinc Rich Primer" (HG/T 3668).
5.6.3 Variety and technical performance of the fire-proof coating shall meet the
relevant requirements of the design document and the current national
standard "Fire Resistive Coating for Steel Structure" (GB 14907).
5.6.4 Construction quality acceptance of the fire-proof coating for steel structure
shall meet the relevant requirements of the current national standard "Code for
Acceptance of Construction Quality of Steel Structures" (GB 50205).
5.7...