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GB 50755-2012 English PDF (GB50755-2012)

GB 50755-2012 English PDF (GB50755-2012)

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GB 50755-2012: Code for construction of steel structures

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.
GB 50755-2012
NATIONAL STANDARD OF THE
PEOPLE 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 & 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 Material Storage
5.7.1 Specified person, who should take the enterprise training, shall be assigned to be in charge of the management of material storage and finished products.
5.7.2 Materials shall be inspected before the warehousing. The variety, specification, lot No., quality certificate, Chinese mark and inspection report of the materials shall be confirmed and the surface quality and packages shall be inspected.
5.7.3 Materials that are qualified in the inspection shall be stacked by class according to their variety, specification and lot No. Signs shall be provided for the stacking of materials.
5.7.4 Warehousing and distribution of the materials shall be recorded. At the distribution and collection, the variety, specification and performance of the materials shall be checked.
5.7.5 The surplus materials shall be recycled for management. When they are recycled and warehoused, their variety, specification and quantity shall be checked and they shall be stored by class.
5.7.6 The steel materials shall be stacked such that their deformation and rust are minimized and supported by wood pads or cushion blocks.
5.7.7 Storage of welding materials shall meet the following requirements: 1 Welding materials such as electrodes, welding wires and welding flux
shall be respectively stored in a dry storage chamber according to the variety, specification, lot No.
2 Electrodes, welding flux and porcelain ring of the stud shall be baked 6 Welding
6.1 General Requirements
6.1.1 This Chapter is applicable to constructions such as shielded metal arc welding, gas shielded arc welding, submerged arc welding, electroslag welding and stud welding during the construction of steel structures.
6.1.2 The construction organization of steel structures shall meet basic conditions and personnel qualification of the current national standard "Code for Welding of Steel Structures" (GB 50661).
6.1.3 Expression methods of welding symbols in the welding construction drawing shall meet the relevant requirements of the current national standards "Weld Symbolic Representation on Drawings" (GB/T 324) and "Standard for Structural Drawings" (GB/T 50105). In the drawings, the factory and on-site weld position, type, groove type and weld dimension shall be indicated. 6.1.4 The dimension of the weld groove shall be in accordance with the relevant requirements of the current national standard "Code for Welding of Steel Structures" (GB 50661) and the groove dimension shall be changed only after the procedure qualification is qualified.
6.2 Welding Personnel
6.2.1 Welding technician (welding engineer) shall be provided with
corresponding qualification certificate; for large and important steel structures, the welding technical principal shall obtain intermediate technical title or above and have over five-year welding production or construction experience.
6.2.2 The welding quality inspectors shall have received the welding technology training and obtain corresponding quality inspection qualification certificate after the post training.
6.2.3 Weld non-destructive testing personnel shall obtain a grade certificate issued by the national professional assessment institution and be engaged in weld non-destructive testing inspection according to the qualified items in the certificate and the authority.
6.2.4 The welder shall pass through the examination and obtain a qualification certificate; he/she shall carry out the welding within the approved range and is strictly forbidden to take up his/her post without a certificate.
6.3 Welding Procedure
I Welding Procedure Qualification and Scheme
to 90 %;
3 When the manual arc welding and self-shielded flux-cored wire arc
welding are carried out, the maximum wind speed in the welding operation area shall be less than or equal to 8 m/s; when the gas shielded arc welding is carried out, the maximum wind speed in the welding operation area shall be less than or equal to 2 m/s.
6.3.4 For the on-site overhead welding, stable operation platform and protection shed shall be erected.
6.3.5 Before welding, tools such as wire brush and grinding wheel shall be adopted to remove the foreign bodies such as scale, rust and oil stain on the surface to be welded; the weld groove should be inspected according to the relevant requirements of the current national standard "Code for Welding of Steel Structures" (GB 50661).
6.3.6 The welding shall be carried out according to the welding parameters for the procedure qualification.
6.3.7 When the ambient temperature for welding is less than 0 ??C and greater than or equal to -10 ??C, heating or protection measures shall be taken; as for the base material greater than or equal to 2 times of the steel plate thickness and not less than 100 mm in directions of the welded joints and surfaces, it shall be welded after it is heated to the minimum preheat temperature that shall be greater than or equal to 20 ??C.
III Tack Welding
6.3.8 Thickness of the tack welded joint shall be greater than or equal to 3 mm and should be less than or equal to 2/3 of the design weld thickness; the length should be greater than or equal to 40 mm and 4 times of the thickness of the thinner part in the joint; the spacing should be 300 mm ~ 600 mm.
6.3.9 Tack welded joint and the formal weld shall have...

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