GB 55006-2021 English PDF (GB55006-2021)

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GB 55006-2021: Code for design of steel structures
GB 55006-2021
GB
NATIONAL STANDARD OF THE
PEOPLE’S REPUBLIC OF CHINA
UDC
P GB 55006-2021
General specification for steel structures
ISSUED ON: APRIL 09, 2021
IMPLEMENTED ON: JANUARY 01, 2022
Issued by: Ministry of Housing and Urban-Rural Development of PRC;
State Administration for Market Regulation.
Table of Contents
Foreword ... 3 
1 General ... 6 
2 Basic requirements ... 6 
3 Materials ... 8 
4 Components and connection design ... 9 
4.1 Ordinary steel components ... 9 
4.2 Cold-formed steel components ... 10 
4.3 Stainless steel components ... 10 
4.4 Steel structure connection ... 11 
4.5 Fatigue ... 11 
4.6 Construction requirements ... 12 
5 Structural design ... 12 
5.1 Steel structure of light-weight house with portal frame ... 12 
5.2 Multi-floor and high-rise steel structures ... 13 
5.3 Large-span steel structure... 14 
5.4 Tower mast steel structure ... 15 
5.5 Steel silo structure ... 16 
5.6 Urban steel bridge ... 17 
6 Seismic and protection design ... 17 
6.1 Seismic design ... 17 
6.2 Seismic isolation and damping design ... 18 
6.3 Protection design... 19 
7 Construction and acceptance... 19 
7.1 Production and installation ... 19 
7.2 Welding ... 20 
7.3 Acceptance ... 21 
8 Maintenance and removal ... 22 
8.1 Maintenance ... 22 
8.2 Structural disposal ... 22 
8.3 Demolition ... 23 
General specification for steel structures
1 General
1.0.1 In order to ensure the quality and safety of steel structure projects,
implement policies on resource and energy conservation and rational utilization,
protect the ecological environment, ensure the safety of people’s lives and
property and personal health, prevent and reduce steel structure engineering
accidents, improve the level of green development of steel structure projects,
this specification is hereby formulated.
1.0.2 Except for the following projects, steel structure projects must implement
this specification.
1 Highway and railway bridges;
2 Pressure vessels, chemical vessels, gas pipelines;
3 Water conservancy, hydraulic engineering, water transportation, waterway
engineering.
1.0.3 The construction of steel structures shall follow the following principles:
1 Meet the requirements of applicability, economy, durability;
2 Improve project construction quality AND operation and maintenance level;
3 Comply with national policies on energy conservation, environmental
protection, disaster prevention and mitigation, emergency management;
4 In line with the development direction of construction technology;
encourage the application of new technologies.
1.0.4 Whether the technical methods and measures, which are adopted in the
project construction, meet the requirements of this specification, shall be
determined by the relevant responsible entities. Among them, innovative
technical methods and measures shall be demonstrated AND meet the relevant
performance requirements in this specification.
2 Basic requirements
2.0.1 For the steel structure engineering, it shall determine the design service
life, based on factors such as use function, construction cost, use and
maintenance cost, environmental impact. It shall adopt different safety levels,
according to the severity of the possible consequences of structural damage;
reasonably determine the structural action and action combination, seismic
action and action combination; adopt appropriate design methods, to ensure
the safety, applicability, durability of the structure.
2.0.2 For steel structures, it shall select a reasonable structural system,
according to the functional requirements of the building (structure), the on-site
environmental conditions, etc.
2.0.3 Within the design service life, the steel structure shall meet the following
requirements:
1 It shall be able to withstand various actions, within the design load range,
that may occur during normal construction and use;
2 It shall be kept in normal use;
3 It shall have durability that can reach the design service life, under normal
use and normal maintenance conditions;
4 It shall be able to function normally, within the specified time, under fire
conditions;
5 When explosions, impacts and other accidents occur, the structure shall
remain stable; there shall be no damage, that is not commensurate with
the cause.
2.0.4 The use and maintenance of steel structures and components, within the
design service life, shall meet the following requirements:
1 Without technical appraisal or design permission, it shall not change the
functions and conditions of use, which are specified in the design
documents;
2 For matters that may affect the safety and durability of the main structure
AND cause public safety risks to the public, it shall establish a regular
inspection and maintenance system;
3 The components, joints, supports, parts, etc., that must be replaced
according to the design requirements, shall be replaced in time;
4 The fire protection and anti-corrosion protection layer on the surface of the
components shall be maintained or replaced, in accordance with the
design requirements and maintenance requirements;
5 When the structure, components, joints, bearings, etc. have deformation
and durability defects, that exceed the design requirements, they shall be
the tensile force is small and the bending moment is relatively large, it shall
prevent the overall instability of the tension-bending member.
4.2 Cold-formed steel components
4.2.1 For the axial tension members and tension-bending members, which are
mainly under tension, shall be subject to the verification of strength and rigidity.
4.2.2 Axial compression members, bending members, compression-bending
members, tension-bending members which are mainly subjected to bending,
shall be checked for strength, stability, rigidity.
4.2.3 In the design of rigid frames, roof trusses, purlins, wall beams, it shall
verify the strength, stability, rigidity of the members. Meanwhile, it shall also
consider the adverse effects of changes in the internal forces of the members,
due to wind suction.
4.2.4 For the cold-formed steel components, that have undergone heat
treatment, such as annealing, welding, hot-dip galvanizing, shall not adopt the
strength design value, which considers the cold-bending effect.
4.3 Stainless steel components
4.3.1 Stainless steel structural materials shall be selected, according to factors
such as the safety level of the structure, design service life, working
environment, corrosion resistance requirements, surface requirements, etc.
4.3.2 The design of stainless steel components shall meet the following
requirements:
1 The tensile strength of stainless steel components shall be calculated,
based on the net section; the compressive strength shall be calculated,
based on the effective net section; the stable bearing capacity of the
member shall be calculated, based on the effective section; the stability
coefficient shall be calculated, based on the gross section.
2 The stainless steel axial tension members and tension-bending members
shall be subject to the verification of strength and stiffness.
3 The stainless steel axial compression members, bending members,
compression-bending members shall be checked for strength, stability,
rigidity.
4 For stainless steel welded flexural members, that are directly subjected to
dynamic loads OR whose buc...