GB 50205-2020 PDF in English
GB 50205-2020 (GB50205-2020) 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: PDF in English GB 50205-2020
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.
Table of Contents
Foreword ... 8
1 General requirements ... 12
2 Terms and symbols ... 12
2.1 Terms ... 12
2.2 Symbols ... 14
3 Basic requirements ... 15
4 Materials and products approach ... 17
4.1 General requirements... 17
4.2 Steel sheet ... 17
4.3 Steel profiles and pipes ... 19
4.4 Steel castings ... 20
4.5 Cables, tie rods and anchorage ... 22
4.6 Welding materials ... 23
4.7 Fasteners for connections ... 24
4.8 Materials of spherical joints ... 26
4.9 Profiled metal plate... 27
4.10 Membrane materials of membrane structures ... 28
4.11 Coating materials ... 29
4.12 Products and others ... 30
5 Welding engineering ... 30
5.1 General requirements... 30
5.2 Welding engineering of steel member ... 31
5.3 Stud (welding nail) welding engineering ... 37
6 Connection engineering of fasteners ... 38
6.1 General requirements... 38
6.2 Connection of ordinary fasteners ... 39
6.3 Connection of high strength bolts ... 40
7 Processing of steel parts and steel components ... 42
7.1 General requirements... 42
7.2 Cutting ... 42
7.3 Rectification and formation ... 43
7.4 Trimming of edges ... 48
7.5 Processing of spherical joints ... 50
7.6 Processing of steel castings ... 53
7.7 Holing ... 55
8 Assembling engineering of steel elements ... 57
8.1 General requirements... 57
8.2 Assembling and butting of components ... 57
8.3 Assembling ... 59
8.4 Milling of element ends and compacting of contact surface ... 61
8.5 Shapes and sizes of steel elements ... 62
9 Test assembling engineering of steel elements ... 70
9.1 General requirements... 70
9.2 Entity test assembling ... 71
9.3 Simulation test assembling... 72
10 Installation engineering of steel frame structures ... 73
10.1 General requirements... 73
10.2 Foundation and anchor bolts (anchor) ... 74
10.3 Installation of steel columns ... 76
10.4 Installation of steel roof truss (shelves), beam (truss) ... 79
10.5 Installation of connection joints ... 82
10.6 Installation of steel sheet shear wall... 83
10.7 Installation of supports, purlins, wall frames and secondary structures ... 85
10.8 Installation of steel platform and stairs ... 86
10.9 Overall steel structures ... 88
11 Installation engineering of space structures ... 90
11.1 General requirements ... 90
11.2 Installation of bearing and anchor bolt (anchor) ... 90
11.3 Installation of steel grid structure and reticulated shell ... 92
11.4 Steel pipe truss structure ... 94
11.5 Making of cable and member ... 95
11.6 Making of membrane element ... 97
11.7 Installation of cable and member ... 98
11.8 Installation of membrane structures ... 99
12 Profiled metal sheet engineering ... 100
12.1 General requirements... 100
12.2 Making of profiled metal sheet ... 101
12.3 Installation of profiled metal sheet ... 103
12.4 Installation of fixation apparatus ... 106
12.5 Connection construction and joints ... 108
12.6 Metal roofing system ... 108
13 Coating engineering ... 109
13.1 General requirements... 109
13.2 Anticorrosive coating painting ... 110
13.3 Coating of connection parts and repairing of coating defects ... 112
13.4 Fire resistant paint coating ... 114
14 Parts projects completion acceptance of steel structures ... 115
Appendix A Inspection items and methods of steel products ... 118
Appendix B Inspection items of fastener connection engineering ... 122
Appendix C Wind resistant performance testing methods of metal roofing
system ... 128
Appendix D Procedure qualification of anticorrosive coating ... 134
Appendix E Determination methods of fire resistant paint coating thickness138
Appendix F Inspection and evidential testing of safety and function about sheet
structures ... 140
Appendix G Inspection items for quality of appearance about steel structures
... 142
Appendix H Records of inspection batches of item for quality acceptance .. 143
Appendix J Method of quantity survey for steel structure ... 158
Explanation of wording in this standard ... 160
List of quoted standards ... 161
Standard for acceptance of construction quality of
steel structures
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
The profiled metal sheet whose longitudinal edges of the formed sheet are
profiled edges that can be overlapped with each other, whose sheets are
connected to structures through fasteners after being naturally overlapped.
2.1.16 Up standing seam metal sheet
The profiled metal sheet whose longitudinal edges of the formed sheet are
profiled edges that can be overlapped with each other and, after the sheet and
the sheet are naturally overlapped, which are crimped along the length direction
by a special machine and connected to the structure through a fixed bracket.
2.1.17 Clip-lock metal sheet
The profiled metal sheet whose longitudinal sides of the formed sheet are
profiled edges that can be overlapped with each other and the sheet-sheet
installation of which is connected to the structure through a fixed bracket, after
being clipped and pressed-in.
2.1.18 Flashing
An element having a certain shape as formed by rolling or mechanical bending
of metal sheet, which is used to seal the edges of the gaps after the roof and
wall profiled metal sheets are paved to prevent rainwater leakage.
2.1.19 Metal roofing system
The general term for the roof enclosure system composed of metal panels, fixed
brackets, bottom plates, fasteners, heat preservation, moisture proof, heat
insulation, sound insulation and other materials.
2.2 Symbols
2.2.1 Function and effect:
P - Design value of pretension of high-strength bolt;
ΔP - The loss of the pretension of the high-strength bolt;
Tch - Checking torque of high-strength bolt;
Tc - Final tightening torque of high-strength bolts;
T0 - Initial tightening torque of high-strength bolt.
2.2.2 Geometric parameters:
α - Spacing;
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:
1 The raw materials and finished products used shall be subject to
mobilization acceptance. All raw materials and finished products involving
safety and function shall be re-inspected in accordance with the provisions
of 14.0.2 of this standard, meanwhile the sampling and sample delivery
shall be witnessed by the supervision engineer (technical person in charge
of the construction organization);
2 The quality control of each process shall be carried out according to the
construction technical standards; inspection shall be carried out after each
process is completed;
3 The handover inspection shall be carried out between the relevant trades;
it shall be inspected and approved by the supervision engineer (the
technical person in charge of the construction organization).
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).
3.0.6 The qualified quality standard of the inspection batch shall meet the
following requirements:
1 The main control items must meet the quality requirements of this standard;
2 The inspection results of general items shall have 80% or more check
points (values) that meet the requirements of this standard, meanwhile the
maximum (or minimum) value shall not exceed 1.2 times the allowable
deviation value.
3.0.7 The qualified quality standards for item work shall meet the following
requirements:
1 Each inspection batch included in the item work shall meet the quality
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
Inspection quantity: Follow the Appendix A of this standard to carry out
inspection based on the re-inspection batch size.
Inspection method: Witness the sampling and sample delivery; check the re-
inspection report.
II General items
4.3.3 The cross-sectional size, thickness and allowable deviation of profiles and
pipes shall meet the requirements of their product standards.
Inspection quantity: Spot inspection for 10% of each batch of profiles of the
same variety and specification; meanwhile it is no less than 3 pieces, 3 locations
per piece shall be inspected.
Inspection method: Use steel ruler, vernier caliper and ultrasonic thickness
gauge for measurement.
4.3.4 The allowable deviation of the profile and pipe dimensions shall meet the
requirements of their product standards.
Inspection quantity: Spot inspection for 10% of each batch of profiles 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 and steel ruler for measurement.
4.3.5 The surface appearance quality of profiles and pipes shall meet the
requirements of Article 4.2.5 of this standard.
Inspection quantity: Inspection for all.
Inspection method: Observation inspection.
4.4 Steel castings
I Main control item
4.4.1 The types, specifications and performance of the steel castings shall
meet the requirements of the current national standards and meet the
design requirements. When the steel castings enter the site, test pieces
shall be taken according to the current national standards, to be subject
to the inspection of the yield strength, tensile strength, elongation and
thickness deviation; the inspection results shall comply with the current
national standards.
Inspection quantity: All quality certification documents are inspected; the
4.5 Cables, tie rods and anchorage
I Main control item
4.5.1 The types, specifications and performance of the cables, tie rods
and anchorages shall meet the requirements of the current national
standards and meet the design requirements. When the cables, tie rods
and anchorages enter the site, test pieces shall be taken according to the
current national standards, to be subject to the inspection of the yield
strength, tensile strength, elongation and thickness deviation; the
inspection results shall comply with the current national standards.
Inspection quantity: All quality certification documents are inspected; the
sampling quantity is determined according to the sampling inspection
plan of the incoming batches and products.
Inspection method: Check quality certification documents and sampling
inspection report.
4.5.2 The cables, tie rods, anchorages shall be sampled for re-inspection in
accordance with the provisions of Appendix A of this standard; the re-inspection
results 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 item
4.5.3 The allowable deviation of the dimensions of cables, tie rods, anchorages
and their connectors shall meet the requirements of their product standards and
design.
Number of inspections: Inspection for all.
Inspection method: Use steel ruler, vernier caliper and stayguy for
measurement.
4.5.4 The surface of the cable, the tie rod and its sheath shall be smooth; there
shall be no cracks and visual defects such as folding, delamination, scarring
and erosion.
Inspection quantity: Inspection for all.
Inspection method: Observation inspection.
Inspection quantity: Spot inspection for 1% per batches and shall not be less
than 10 sets.
Inspection method: Use steel ruler and vernier caliper for measurement.
4.6.4 The construction organization shall re-inspect the mechanical properties
and welding performance of the welding studs in accordance with the current
national standard "Cheese head studs for arc stud welding" GB/T 10433; the
results of the re-inspection shall meet the requirements of the current national
standards and meet the design requirements.
Inspection quantity: A set of re-inspections shall be carried out for each batch
number and it shall not be less than 5 tensile and 5 bending tests.
Inspection method: Witness the sampling and sample delivery; check the re-
inspection report.
4.6.5 The appearance of the welding rod shall not have defects such as peeling
of the coating or the welding core rust; the flux shall not be damp and
agglomerate.
Inspection quantity: Spot inspection for 1% per batches and shall not be less
than 10 packages.
Inspection method: Observation inspection.
4.7 Fasteners for connections
I Main control items
4.7.1 The variety, specification and performance of the assemble of high-
strength bolt for steel structure connection shall meet the requirements
of the current national standards and meet the design requirements. The
assemble of high-strength large hexagon head bolt shall be accompanied
by a torque coefficient inspection report; the torsion-shear type assemble
of high-strength bolt shall be accompanied by a tightening axial force
(pre-tension) inspection report. When the high-strength large hexagon
head bolt assemble and the torsion-shear type high-strength bolt
assemble enter the site, the test pieces shall be taken according to the
current national standards and the torque coefficient for testing of the
torque coefficient and tightening axial force (pre-tension), respectively.
The inspection results shall meet the requirements of the current national
standards.
Inspection quantity: All quality certification documents are inspected; the
sampling quantity is determined according to the sampling inspection
results shall meet the requirements of their product standards.
Inspection quantity: Random check 8 pieces according to specifications.
Inspection method: Use hardness tester for measurement.
4.7.7 For ordinary bolts, self-tapping screws, rivets, pull rivets, shot nails,
anchor bolts (mechanical and chemical reagent type), anchor bolts and other
fastening standard parts, nuts, washers, etc., their varieties, specifications,
performance shall meet the requirements of the current national product
standards and meet the design requirements.
Inspection quantity: Inspection for all.
Inspection method: Check the product quality certificate, Chinese product mark
and inspection report, etc.
4.8 Materials of spherical joints
I Main control item
4.8.1 The types, specifications and performance of the raw materials used to
make the bolt sphere shall meet the requirements of the current national
standards and meet the design requirements.
Inspection quantity: Inspection for all.
Inspection method: Check the product quality certificate, Chinese product mark
and inspection report, etc.
4.8.2 The types, specifications, performances, etc. of the raw materials used in
the production of sealing plates, cones and sleeves shall comply with the
current national standards and meet the design requirements.
Inspection quantity: Inspection for all.
Inspection method: Check the product quality certificate, Chinese product mark
and inspection report, etc.
4.8.3 The variety, specification, performance, etc. of the steel sheet used to
make the welding sphere shall meet the requirements of the current national
standards and meet the design requirements.
Inspection quantity: Inspection for all.
Inspection method: Check the product quality certificate, Chinese product mark
and inspection report, etc.
and meet the design requirements.
Inspection quantity: Random inspection of 5% for each specification and no less
than 10 pieces.
Inspection method: The thickness of the substrate is measured by a thickness
gauge; the thickness of the coating layer is measured by the weighing method.
4.9.6 The fixing bracket for the profiled metal sheet shall be free of deformation;
the surface shall be flat and smooth, free of cracks, damage, and corrosion.
Inspection quantity: Based on inspection batch or random inspection for 5% per
each batch of incoming quantity.
Inspection method: Square measurement and observation inspection.
4.9.7 Fasteners for profiled metal sheet shall be free from damage and
corrosion on the surface.
Inspection quantity: Based on inspection batch or random inspection for 5% per
each batch of incoming quantity.
Inspection method: Observation inspection.
4.9.8 The appearance quality of rubber pads, sealants and other special
materials for profiled metal sheet shall meet the product standard requirements;
the packaging shall be intact.
Inspection quantity: Sample 10% for inspection according to each batch of
incoming quantity.
Inspection method: Observation inspection.
4.10 Membrane materials of membrane structures
I Main control item
4.10.1 The varieties, specifications, performances, etc. of the membrane
materials used for membrane structure shall meet the requirements of the
current national standards and meet the design requirements. The quality of
imported membrane products shall meet the requirements of the design and
contract.
Inspection quantity: Inspection for all.
Inspection method: Check the product quality certificate, Chinese product mark
and inspection report, etc.
4.11.3 The model, name, color and validity period of the anticorrosive coating
and fireproof coating shall be consistent with their quality certification
documents. After unpacking, there shall be no crusts, lumps, gels, etc.
Inspection quantity: Random inspection for 5% of the number of barrels and it
shall not be less than 3 barrels.
Inspection method: Observation inspection.
4.12 Products and others
I Main control item
4.12.1 The variety, specification and performance of steel structure bearings
and rubber pads shall comply with the current national standards and meet the
design requirements.
Inspection quantity: Inspection for all.
Inspection method: Check the product quality certificate, Chinese product mark
and inspection report, etc.
4.12.2 For other materials and finished products involved in steel structure
projects, their varieties, specifications, performances, etc. shall meet the
requirements of the current national standards and meet the design
requirements.
Inspection quantity: Inspection for all.
Inspection method: Check the product quality certificate, Chinese product mark
and inspection report, etc.
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.
Inspection quantity: Random inspection of 10% of each batch of similar
elements for grade 2 welds under static load, 15% of each batch of similar
elements for grade 1 welds under static load and welds under dynamic load,
and no less than 3 pieces: among the elements to be spot-checked, 5% of each
type of weld shall be spot-checked according to the weld number, and it shall
not be less than 1; 1 location shall be spot checked per weld and the total
number of spot-checks shall not be less than 10 locations.
Inspection method: Use weld gauge for inspection.
5.2.9 For welds that require preheating or post-heating, the preheating
temperature or post-heating temperature shall comply with the current national
standards or be determined by welding procedure qualification.
Inspection quantity: Inspection for all.
Inspection method: Check the pre-heating or post-heating construction records
and welding procedure qualification report.
5.3 Stud (welding nail) welding engineering
I Main control item
5.3.1 The construction organization shall conduct welding procedure
qualification for the studs and steel used for welding; the results shall meet the
design requirements and comply with the current national standards. The stud-
welded porcelain ring shall be protected from moisture when stored; the damp-
welded porcelain ring shall be baked at 120 °C ~ 150 °C for 1 h ~ 2 h before
use.
Inspection quantity: Inspection for all.
Inspection method: Check the welding procedure qualification report and
baking record.
5.3.2 After the appearance quality inspection of the stud welded joint is qualified,
the bending sampling inspection shall be carried out; there shall be no visible
cracks in the weld and heat-affected zone.
Inspection quantity: 1% of each inspection batch and shall not be less than 10.
Inspection method: Visually inspect the studs after bending for 30°.
II General item
5.3.3 The visual inspection of stud welded joints shall meet the requirements of
Table 5.3.3-1. When the arc welding method is used for stud welding, the
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: Ra......
......
Source: Above contents are excerpted from the PDF -- translated/reviewed by: www.chinesestandard.net / Wayne Zheng et al.
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