GB 50205-2020 PDF English
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Standard for acceptance of construction quality of steel structures
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Code for Acceptance of Construction quality of Steel Structures
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Code for construction and acceptance of steel structure engineering
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GB 50205-2020: Standard for acceptance of construction quality 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/GB50205-2020
GB
NATIONAL STANDARD OF THE
PEOPLE’S REPUBLIC OF CHINA
UDC
P GB 50205-2020
Standard for acceptance of construction quality of
steel structures
Issued on: JANUARY 16, 2020
Implemented on: AUGUST 01, 2020
Issued by. Ministry of Housing and Urban-Rural Development of PRC;
State Administration for Market Regulation.
NATIONAL STANDARD OF THE
PEOPLE’S REPUBLIC OF CHINA
Standard for acceptance of construction quality of
steel structures
Main drafting organization. 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
Date of implementation. August 1, 2020
2020 Beijing
Announcement of the Ministry of Housing and Urban-Rural
Development of the People's Republic of China
No.48 of 2002
Table of Contents
Foreword... 8
1 General requirements... 12
2 Terms and symbols... 12
3 Basic requirements... 15
4 Materials and products approach... 17
5 Welding engineering... 30
6 Connection engineering of fasteners... 38
7 Processing of steel parts and steel components... 42
8 Assembling engineering of steel elements... 57
9 Test assembling engineering of steel elements... 70
1 General requirements
1.0.1 In order to strengthen the quality management of construction projects,
unify the acceptance of construction quality of steel structure projects, ensure
the quality of steel structure projects, this standard is hereby formulated.
1.0.2 This standard is applicable to the acceptance of construction quality of
steel structure engineering of industrial and civil buildings and structures.
1.0.3 This standard should be used in conjunction with the current national
standard "Unified acceptance standard for building construction quality" GB
50300.
1.0.4 In addition to this standard, the acceptance of construction quality of steel
structure projects shall also comply with the current relevant national standards.
2 Terms and symbols
2.1 Terms
2.1.1 Part
The smallest unit that constitutes a part or component, such as a gusset sheet,
a flange sheet, etc.
2.1.2 Component
A unit composed of several parts, such as welded H-beams, steel brackets, etc.
2.1.3 Element
The basic unit of steel structure composed of parts or parts and components,
such as beams, columns, supports, etc.
2.1.4 The smallest assembled rigid unit
In the installation project of steel grid and reticulated shell structure, the smallest
installation unit except for the loose parts, which is generally divided into two
types. plane truss and cone.
2.1.5 Assemble of high strength bolt
A general term for high-strength bolts and matching nuts and washers.
2.1.6 Slip coefficient of faying surface
In the high-strength bolt connection, the ratio of the external force when the
friction surface of the connecting piece is slipped to the sum of the pretension
force of the high-strength bolt perpendicular to the friction surface.
2.1.7 Test preassembling
Assembling to check whether the elements meet the installation quality
requirements.
2.1.8 Space rigid unit
A space-stable structure composed of elements.
2.1.9 Stud welding
A method of energizing the arc by contacting one end of the welding nail (stud)
with the surface of the sheet (or pipe) and, after the contact surface is melted,
applying a certain pressure to the welding nail (stud) to complete the welding.
3 Basic requirements
3.0.1 The construction organization of steel structure engineering shall have
corresponding construction technical standards, quality management system,
quality control and inspection system; the construction site shall have approved
construction program, construction plan and other technical documents.
3.0.2 The acceptance of construction quality of steel structure engineering must
use measuring instruments that have passed metrological verification and
calibration. The witness sampling and sample delivery of steel structure
engineering shall be completed by the testing agency.
3.0.3 The engineering technical documents and contract documents used in the
construction of steel structure projects shall have the requirements for the
acceptance of the construction quality of not lower than the provisions of this
standard.
3.0.4 The construction quality control of steel structure engineering shall be
carried out in accordance with the following provisions.
3.0.5 Acceptance of construction quality of steel structure engineering shall be
carried out in accordance with inspection batches, item work, divisional (sub-
divisional) work on the basis of qualified self-inspection by the construction
organization. The division of item work in the divisional (sub-divisional) work of
the steel structure engineering shall be implemented in accordance with the
current national standard "Unified acceptance standard for building
construction quality" GB 50300.The steel structure item work shall be
composed of one or several inspection batches, the inspection batches of each
item work shall be divided according to the provisions of this standard;
meanwhile it shall be confirmed by the supervisor (or construction organization).
4 Materials and products approach
4.1 General requirements
4.1.1 The main materials, parts (components), finished parts, standard parts
and other products for steel structure shall be subject to mobilization
acceptance.
4.1.2 In principle, the division of inspection batches for mobilization acceptance
should be consistent with the inspection batches of each item work. Inspection
batches can also be divided according to the scale of the project and the actual
conditions of incoming materials.
4.2 Steel sheet
I Main control item
4.2.1 The variety, specification and performance of steel sheets shall meet
the requirements of current national standards and meet design
requirements. When the steel sheet enters the site, the test pieces shall
be taken according to the current national standards, to be subject to the
testing of the yield strength, tensile strength, elongation and thickness
deviation. The testing results shall comply with the current national
standards.
Inspection quantity. All quality certification documents are inspected; the
sampling quantity is determined according to the mobilization batch and
the sampling inspection plan of the product.
Inspection method. Check quality certification documents and sampling
inspection report.
4.2.2 The steel sheet shall be subject to the witnessed sampling and
reinspection in accordance with Appendix A of this standard. The results of the
re-inspection shall meet the requirements of the current national standards and
meet the design requirements.
Inspection quantity. Inspection for all.
Inspection method. Witness the sampling and sample delivery; check the re-
inspection report.
II General items
4.2.3 The thickness of the steel sheet and its allowable deviation shall meet the
requirements of its product standards and design documents.
Inspection quantity. Spot inspection for 10% of each batch of steel sheets of
the same variety and specification; meanwhile it is no less than 3 pieces, 3
locations per piece shall be inspected.
Inspection method. Use vernier caliper or ultrasonic thickness gauge to make
measurement.
4.2.4 The flatness of the steel sheet shall meet the requirements of its product
standards.
Inspection quantity. Spot inspection for 10% of each batch of steel sheets of
the same variety and specification; meanwhile it is no less than 3 pieces, 3
locations per piece shall be inspected.
Inspection method. Use stayguy, steel ruler and vernier caliper for
measurement.
4.2.5 The surface appearance quality of the steel sheet shall not only meet the
requirements of the current national standards, but also the following
requirements.
5 Welding engineering
5.1 General requirements
5.1.1 This chapter is applicable to the quality acceptance of welding
engineering for steel element welding and stud (welding nail) in the fabrication
and installation of steel structures.
5.1.2 The inspection batch of steel structure welding engineering can be divided
into one or several inspection batch according to the division principle of
inspection batch of corresponding steel structure production or installation
engineering.
5.1.3 Welds shall be cooled to ambient temperature before visual inspection.
Non-destructive testing shall be performed after the visual inspection is
qualified. The specific inspection time shall comply with the current national
standard "Code for welding of steel structures" GB 50661.
5.1.4 After the welds are welded, they shall be marked on the corresponding
welds and positions according to the welding procedure provisions.
5.2 Welding engineering of steel member
I Main control item
5.2.1 The matching of welding consumables and base metal shall comply with
the requirements of the design documents and the provisions of the current
national standards. Before use, welding materials shall be baked and stored in
accordance with the product manual and welding process documents.
Inspection quantity. Inspection for all.
Inspection method. Check the quality certificate and baking records.
5.2.2 Licensed welders must perform welding within the approved scope
specified in their welder qualification certificate. Unlicensed welders are strictly
prohibited from performing welding.
Inspection quantity. Inspection for all.
Inspection method. Check the welder's qualification certificate and its scope of
approval and validity period.
5.2.3 The construction organization shall perform welding procedure
qualification in accordance with the current national standard "Code for welding
of steel structures" GB 50661; determine the welding procedure according to
the qualification report; compile welding procedure specifications and carry out
the whole process quality control.
Inspection quantity. Inspection for all.
Inspection method. Check welding procedure qualification report, welding
procedure specification, measurement and record of welding process
parameters.
5.2.4 The grade 1 and 2 welds required by the design shall be subjected
to non-destructive testing for internal defects; the quality level and testing
requirements of the grade 1 and 2 welds shall meet the requirements of
Table 5.2.4.
Inspection quantity. Inspection for all.
Inspection method. Check the ultrasonic or radiographic inspection
records.
6 Connection engineering of fasteners
6.1 General requirements
6.1.1 This chapter can be used for the quality acceptance of the connection
engineering for ordinary bolts, torsion-shear type high-strength bolts, high-
strength large hexagon head bolts, steel grid bolts, high-strength bolts for
spherical joints and shooting nails, self-tapping nails, pulling rivets in the
production and installation of steel structures.
6.1.2 The fastener connection engineering can be divided into one or several
inspection batches according to the division principle of the inspection batch of
the production or installation engineering of corresponding steel structure.
6.2 Connection of ordinary fasteners
I Main control item
6.2.1 When ordinary bolts are used as permanent connecting bolts, when the
design has requirements or their quality is doubtful, the minimum tensile load
of the bolts shall be re-inspected. The test method can be implemented in
accordance with Appendix B of this standard; the results shall meet the
requirements of the current country standard "Mechanical properties of
fasteners - Bolts, screws and studs" GB/T 3098.1.
Inspection quantity. 8 bolts of each specification shall be randomly inspected.
Inspection method. Check the physical bolt reinspection report.
6.2.2 The specification size of self-tapping nails, pulling rivets, shooting nails
used to connect the thin steel sheets shall match the connected steel sheets;
meet the design requirements; their spacing and edge distance shall meet the
design requirements.
Inspection quantity. 1% of the number of connection joints shall be randomly
inspected and shall not be less than 3.
Inspection method. Observation and ruler inspection.
II General items
6.2.3 The fastening of permanent ordinary bolts shall be firm and reliable; the
number of exposed threads shall not be less than 2.
Inspection quantity. 10% of the number of connected nodes shall be randomly
inspected and shall not be less than 3.
Inspection method. Observe and check by knocking with a small hammer.
6.2.4 Self-tapping screws, pulling rivets, shooting nails, etc. shall be tightly
attached to the connected steel sheet; it shall be neatly arranged.
Inspection quantity. Randomly inspect 10% of the number of connection joints
and shall not be less than 3.
Inspection method. Observe or check by knocking with a small hammer.
7.2 Cutting
I Main control item
7.2.1 The cut surface or shear surface of steel shall be free of cracks, slag
inclusions, burrs and delamination.
Inspection quantity. Inspection for all.
Inspection method. Observe or use a magnifying glass. When in doubt, perform
penetrant, magnetic particle or ultrasonic inspection.
II General items
7.2.2 The allowable deviation of gas cutting shall meet the requirements of
Table 7.2.2.
Inspection quantity. Randomly inspect 10% according to the number of cut
surfaces and it shall not be less than 3.
Inspection method. Observation inspection or check with steel ruler or feeler
gauge.
7.2.3 The allowable deviation of mechanical shearing shall meet the
requirements of Table 7.2.3.The thickness of mechanically sheared parts
should not be greater than 12.0 mm; the shearing surface shall be flat. When
the ambient temperature of carbon structural steel is lower than -16 °C, and the
ambient temperature of low-alloy structural steel is lower than -12 °C, shearing
and punching are not allowed.
Inspection quantity. Randomly check 10% of the number of cutting surfaces
and shall not be less than 3.
Inspection method. Observation inspection or check with steel ruler or feeler
gauge.
7.2.4 The steel pipe rods used for intersecting connection should be cut by a
pipe lathe or a CNC intersecting wire cutting machine. The allowable deviation
of the steel pipe rod processing shall meet the requirements of Table 7.2.4.
Inspection quantity. Randomly check 10% of the number of rods and shall not
be less than 3.
Inspection method. Observation inspection or check with steel ruler or feeler
gauge.
8 Assembling engineering of steel elements
8.1 General requirements
8.1.1 This chapter can be used for the quality acceptance of element assembly
in steel structure production and installation.
8.1.2 The steel structure assembly engineering can be divided into one or
several inspection batches according to the division principle of the inspection
batch of steel structure production engineering.
8.1.3 For the assembly of elements, it shall determine a reasonable assembly
sequence according to design requirements, element form, connection mode,
welding method and welding sequence.
8.1.4 The splicing of sheets and profiles shall be carried out before the
assembly of elements. The assembly of elements shall be carried out after the
components are assembled, welded, rectified and passed inspection. The
concealed parts of the elements shall be closed after welding, bolting and
painting are qualified.
8.2 Assembling and butting of components
I Main control item
8.2.1 The quality level of welds used when splicing or butting steels and
steel components shall meet the design requirements. When there is no
design requirement, penetration welds with a quality level of not less than
grade 2 shall be used; for welds that directly bear tensile forces, the grade
1 penetration welds shall be used.
Inspection quantity. Inspection for all.
Inspection method. Check the ultrasonic inspection report.
II General items
8.2.2 The staggered distance between the flange splicing seams and the web
splicing seams of welded H-section steel should not be less than 200 mm. The
splicing length of the flange sheet shall not be less than twice the width of the
flange sheet and not less than 600 mm. The splicing width of the web shall not
be less than 300 mm. The length shall not be less than 600 mm.
Inspection quantity. Inspection for all.
Inspection method. Observe and check with steel ruler.
9 Test assembling engineering of steel elements
9.1 General requirements
9.1.1 This chapter can be used for the quality acceptance of test assembling
engineering of steel elements.
9.1.2 The test assembling engineering of steel elements can be divided into
one or several inspection batches according to the division principle of the
inspection batch of steel structure fabrication engineering.
9.1.3 The supporting stool or platform used for test assembling shall be
measured and leveled; all temporary fixing and tensioning devices shall be
removed during inspection.
9.1.4 The quality of pre-assembled steel elements shall not only meet the
requirements of this standard, but also meet the design requirements.
9.1.5 When using computer simulation to simulate test assembling, the external
dimensions of the simulated elements or units shall be the same as the actual
geometric dimensions. When the deviation of test assembling using computer
simulation exceeds the relevant requirements of this standard, entity test
assembling shall be carried out according to the requirements of this chapter.
9.2 Entity test assembling
I Main control item
9.2.1 For multilayer laminates connected by high-strength bolts and ordinary
bolts, a hole tester shall be used to check the passing rate of bolt holes; it shall
meet the following requirements.
......
Source: Above contents are excerpted from the full-copy PDF -- translated/reviewed by: www.ChineseStandard.net / Wayne Zheng et al.
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