GB 50755-2012 PDF English
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| Standard ID | Contents [version] | USD | STEP2 | [PDF] delivery | Name of Chinese Standard | Status |
| GB 50755-2012 | English | 175 |
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Code for Construction of Steel Structures
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GB 50755-2012: Code for Construction of Steel Structures---This is an excerpt. Full copy of true-PDF in English version (including equations, symbols, images, flow-chart, tables, and figures etc.), auto-downloaded/delivered in 9 seconds, can be purchased online: https://www.ChineseStandard.net/PDF.aspx/GB50755-2012
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.
National Standard of the People's Republic of China
Code for Construction of Steel Structures
Chief Development Department.
Ministry of Housing and Urban-Rural Development of the People's
Republic of China
Approval Department.
Ministry of Housing and Urban-Rural Development of the People's
Republic of China
Implementation Date.
August 1, 2012
2012 Beijing
Table of Contents
Foreword... 4
1 General Provisions... 9
2 Terms and Symbols... 10
3 Basic Requirements... 13
4 Design of Construction Stage... 15
5 Materials... 18
6 Welding... 26
7 Connecting of Fasteners... 36
8 Processing of Steel Parts and Components... 45
9 Assembling and Processing of Members... 54
10 Test Assembling of Steel Structures... 58
11 Installation of Steel Structures... 60
12 Profiled Metal Plate... 70
13 Coating... 72
14 Construction Survey... 78
15 Construction Monitoring... 83
16 Construction Safety and Environmental Protection... 86
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.
2.1.5 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.
2.1.12 Test assembling
The test assembling carried out in advance to inspect whether the shape and
dimension of the member meet the quality requirements.
2.1.13 Ambient temperature
The temperature at the site during the fabrication or installation
2.2 Symbols
2.2.1 Geometric parameters
2.2.3 Other
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.
3.0.7 For the construction of steel structures, quality process control shall be
carried out according to the following requirements.
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.
4.2 Structure Analysis of Construction Stage
4.2.1 When the construction method or sequence of steel structures has larger
influence on their internal force and deformation or special requirements are
made in the design documents, the structure analysis of construction stage
shall be carried out;
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.
4.4 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.
4.4.4 The member weight shall be calculated and listed in the detail drawing for
construction of steel structures;
5 Materials
5.1 General Requirements
5.1.1 This Chapter is applicable to ordering, site acceptance, re-inspection and
storage management of steel structure materials.
5.1.2 Materials used in the steel structures shall meet the requirements of
design documents and current relevant standards of the nation;
5.2 Steel Materials
5.2.1 When the steel materials are ordered, the variety, specification and
performance shall meet the requirements of the design documents and current
standards of the nation with regard to steel materials; the standards of common
steel products should be adopted according to those specified in Table 5.2.1.
5.2.3 The site acceptance for the steel materials shall not only meet those
5.2.4 The re-inspection for the steel materials shall cover the mechanical
performance test and chemical composition analysis;
5.3 Welding Materials
5.3.1 The variety, specification and performance of welding materials shall meet
the requirements of the current relevant product standards of the nation and
the design requirements.
5.5 Steel Castings, Anchorages and Pins
5.5.1 Casting materials selected for the steel castings shall meet the
requirements of the standards listed in Table 5.5.1 and the design document.
5.5.2 The prestress steel structure anchorages shall be selected according to
the variety, anchorage requirements and pretension process etc.;
5.5.3 The specification and performance of the pins shall meet the relevant
requirements of the design document and the current national standard "Clevis
Pin with Head" (GB/T 882).
5.6 Coating Materials
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.
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).
6.2 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
6.3 Welding Procedure
I Welding Procedure Qualification and Scheme
6.3.1 For parameters such as the steel materials, welding materials, welding
method, joint type, welding position and post-weld heat treatment as well as
combination of parameters that are firstly adopted by the construction
organization, the welding procedure qualification test shall be carried out before
the fabrication and installation of steel structures.
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).
6.3.15 The adopted welding procedure and sequence shall minimize the
member deformation and shrinkage and the following welding sequences to
control the deformation may be adopted.
7 Connecting of Fasteners
7.1 General Requirements
7.1.1 This Chapter is applicable to connection of fasteners such as ordinary bolt
in the manufacturing and installation of steel structures, tor-shear type high
strength bolt, high strength large hexagon head bolt, high strength bolts for
bolted spherical node of steel space frame, rivet and tapping screw and fastener.
7.2 Preparation of Connecting Pieces and Friction Surface Treatment
7.2.1 The bolt holes of connecting pieces shall be prepared according to the
relevant requirements of Chapter 8 in this Code;
7.3 Connection of Ordinary Fasteners
7.3.1 Ordinary bolt may be fastened with an ordinary spanner so that the
contact surface of the connected piece, bolt head and nut are closely contacted
with the member surface. The ordinary bolt shall be fastened firstly from the
middle and then to both sides in symmetry. In addition, secondary screwing
should be adopted for large joint.
7.3.2 When the ordinary bolt is regarded as a permanent connecting bolt, the
fastening shall meet the following requirements.
8 Processing of Steel Parts and Components
8.1 General Requirements
8.1.1 This Chapter is applicable to the processing of parts and components in
the fabrication of the steel structures.
8.2 Setting out and Marking-off
8.2.1 The setting out and marking-off shall be carried out according to the detail
drawing for construction and process document; and an allowance shall be
reserved as required.
8.3 Cutting
8.3.1 Gas cutting, mechanical cutting and plasma cutting methods may be
adopted for the cutting of the steel materials; the selected cutting method shall
meet the requirements of the process document and the flash and burr after
cutting shall be cleaned up.
8.3.5 The thickness of the parts under mechanical shearing should be less than
or equal to 12.0 mm; the cut surface shall be flat and smooth. 8.7 Processing of Bolted Spheres and Welded Hollow Spheres
8.7.1 Hot forging should be adopted for the formation of bolted spheres; heating
temperature should be 1150 °C ~ 1250 °C. The final forging temperature shall
be greater than or equal to 800 °C. The bolted spheres after formation shall be
free from crack, wrinkle and over-burning.
8.8 Processing of Cast Steel Node
8.8.1 Casting process and processing quality of the cast steel node shall meet
the requirements of the design document and current relevant standards of the
nation.
8.9 Processing of Rope Nodes
8.9.1 Rope nodes may be processed into a blank by methods such as casting,
forging and welding, subject to the machining such as turning, milling, planing,
drilling and boring.
9 Assembling and Processing of Members
9.1 General Requirements
9.1.1 This Chapter is applicable to assembling and processing of members in
the fabrication and installation process of the steel structures.
9.1.5 Reasonable member assembling sequence shall be determined
according to the design requirements, member type, connecting mode, welding
method and welding sequence.
9.1.6 Concealed position of the member shall be closed after the welding and
coating are qualified in the inspection; and coating may be omitted for the
internal surface of the fully-closed member.
9.2 Assembling of Components
9.2.1 The spacing between the assembling joints of the welded H steel flange
plate and the web plate should be greater than or equal to 200 mm.
9.3 Assembling of Members
9.3.1 The member should be assembled on the assembly platform, support or
special equipment. The assembly platform and support shall not only have
adequate strength and stiffness, but also be convenient for
assembling/disassembling and positioning. On the assembly platform or
support, reference lines such as the center line of the member, position line of
end face, contour line and elevation line should be drawn.
9.5 Rectification of Members
9.5.1 The member shape should be rectified according to sequences from the
overall to the local, from the primary to the secondary and from the lower to the
upper.
......
Source: Above contents are excerpted from the full-copy PDF -- translated/reviewed by: www.ChineseStandard.net / Wayne Zheng et al.
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