GB 55008-2021 PDF English
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| Standard ID | Contents [version] | USD | STEP2 | [PDF] delivery | Name of Chinese Standard | Status |
| GB 55008-2021 | English | 425 |
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Code for design of concrete structures
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GB 55008-2021: Code for design of concrete 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/GB55008-2021
UDC
GB
NATIONAL STANDARD OF THE
PEOPLE’S REPUBLIC OF CHINA
General code for concrete structures
Issued on. SEPTEMBER 08, 2021
Implemented on. APRIL 01, 2022
Issued by. Ministry of Housing and Urban Rural Development of the People's
Republic of China;
State Administration for Market Regulation.
National Standard of the People's Republic of China
General code for concrete structures
Main drafter. Ministry of Housing and Urban Rural Development of the People's
Republic of China
Approved by. Ministry of Housing and Urban Rural Development of the People's
Republic of China
Implemented on. APRIL 1, 2022
China Architecture & Building Press
2021 Beijing
Table of Contents
Foreword... 8
1 General... 11
2 Basic regulations... 11
3 Materials... 13
3.1 Concrete... 13
3.2 Steel bar... 16
3.3 Other materials... 17
4 Design... 17
4.1 General provisions... 17
4.2 Structural system... 19
4.3 Structural analysis... 19
4.4 Component design... 20
5 Construction and acceptance... 27
5.1 General provisions... 27
5.2 Template engineering... 27
5.3 Steel bars and prestressing works... 28
5.4 Concrete works... 28
5.5 Prefabricated structural engineering... 28
6 Maintenance and demolition... 29
6.1 General provisions... 29
6.2 Structure maintenance... 29
6.3 Structure disposal... 30
6.4 Demolition... 31
1 General
1.0.1 This Code is formulated to ensure the quality of concrete structural engineering,
the safety of people's lives and property, personal health, and promote the green and
high-quality development of concrete structural engineering.
1.0.2 This Code must be implemented for concrete structural engineering.
1.0.3 Whether the technical methods and measures adopted in engineering construction
comply with the requirements of this Code shall be determined by the relevant
responsible parties. Among them, innovative technical methods and measures shall be
demonstrated and meet the performance requirements of this Code.
2 Basic regulations
2.0.1 Concrete structural engineering shall determine its structural design working life,
structural safety level, seismic fortification category, structural action and action
combination. Structural bearing capacity limit state, normal service limit state, and
durability design shall be carried out. They shall meet the functional and structural
performance requirements of the project.
2.0.2 The selection of strength grade for structural concrete shall meet the requirements
for bearing capacity, stiffness, and durability of the engineering structure. For concrete
structures with a design service life of 50 years, the strength grade of structural concrete
shall also comply with the following regulations. For concrete structures with a design
service life greater than 50 years, the minimum strength grade of structural concrete
shall be higher than the following regulations.
2.0.3 Ordinary steel bars and prestressed steel bars used in concrete structures shall
have strength and elongation that meet the requirements of engineering structures in the
ultimate bearing capacity and normal service limit states.
3 Materials
3.1 Concrete
3.1.1 The main control indicators of cement used in structural concrete shall include
cementation time, stability, mortar strength and chloride ion content. The type and
quantity of mixed materials used in cement shall be clearly stated in the exit-factory
documents.
3.1.2 The sand used for structural concrete shall meet the following requirements.
3.1.3 The firmness indicator of coarse aggregate for structural concrete shall not be
greater than 12%. For concrete with impermeability, frost resistance, corrosion
resistance, wear resistance or other special requirements, the mud content and mud
block content in the coarse aggregate shall not exceed 1.0% and 0.5% respectively. The
firmness indicator shall not be greater than 8%. The mud content and mud block content
of coarse aggregate for high-strength concrete shall not be greater than 0.5% and 0.2%
respectively.
3.1.4 Admixtures for structural concrete shall meet the following requirements.
3.1.5 Concrete mixing water shall control pH, sulfate ion content, chloride ion content,
insoluble content, soluble content. When the concrete aggregate has alkali activity, the
alkali content shall also be controlled. Surface water, ground water, and reclaimed water
shall be tested for radioactivity before first use.
4 Design
4.1 General provisions
4.1.1 The action on the concrete structure and the calculation of its action effect shall
meet the following requirements.
4.1.2 The seismic fortification objectives and anti-seismic measures of concrete
structures shall be determined according to the seismic fortification intensity of the
project location, site category, design earthquake grouping, project's seismic
fortification category, and seismic performance requirements.
4.1.3 When the stress expression is used to calculate the limit state of the bearing
capacity of concrete structural components, the following requirements shall be met.
4.1.4 The prefabricated concrete structure shall determine the connection structure
method and carry out connection and node design according to the structural
performance and the convenience requirements of component production and
installation construction.
4.1.5 The connection between concrete structural components and between non-
structural components and structural components shall comply with the following
requirements.
4.2 Structural system
4.2.1 The concrete structural system shall meet the load-bearing capacity, stiffness and
ductility performance requirements of the project.
4.2.2 The design of the concrete structure system shall meet the following requirements.
4.2.3 The concrete floor of the house building shall meet the requirements of vertical
vibration comfort of the floor. Concrete structure high-rise buildings shall meet the
vibration comfort requirements of the 10-year return period horizontal wind load.
4.3 Structural analysis
4.3.4 When using static or dynamic elastic-plastic analysis methods for structural
analysis of concrete structures, the following requirements shall be met.
4.3.5 Concrete structures shall be analyzed and calculated for overall structural stability
and anti-overturning calculations and shall meet the safety requirements required by the
project.
4.3.6 For concrete structures or structural components with long spans and long
cantilevers, when the seismic fortification intensity is not lower than 7 degrees (0.15g),
the calculation and analysis of vertical seismic action shall be carried out.
4.4 Component design
4.4.1 Concrete structural components shall be calculated according to the stress
conditions of normal section, oblique section, twisted section, punching shear and local
compression. For concrete structures or components subjected to dynamic cycles, the
fatigue bearing capacity of the components shall also be checked.
5 Construction and acceptance
5.1 General provisions
5.1.1 The construction of concrete structures shall ensure the realization of the design
requirements and shall comply with the following regulations.
5.1.2 Materials, components, utensils and semi-finished products shall be inspected and
accepted at the site. They can only be used after they are accepted.
5.1.3 Acceptance of concealed works shall be carried out and records shall be made.
5.1.4 When the formwork is removed, the prefabricated components are lifted, and the
prestressed tendons are stretched and released, the concrete specimens cured under the
same conditions shall reach the specified strength.
5.1.5 The appearance quality of concrete structures shall not have serious defects and
dimensional deviations that affect structural performance and use functions.
5.1.6 Physical quality inspection shall be carried out for representative parts involving
the safety of concrete structures.
5.2 Template engineering
5.2.1 Templates and supports shall be designed according to various control conditions
during the construction process. They shall meet the bearing capacity, stiffness and
overall stability requirements.
5.2.2 Templates and supports shall ensure that the shape, size and position of each part
of the concrete structure and components are accurate.
5.3 Steel bars and prestressing works
5.3.1 Rebar mechanical or welded joint test pieces shall be taken from the completed
entity. The performance test shall be carried out according to the regulations.
5.4 Concrete works
5.4.1 It is strictly forbidden to add water during concrete transportation, conveying and
pouring. Concrete scattered during transportation, conveying and pouring is strictly
prohibited to be used for structural pouring.
5.4.2 The strength grade of structural concrete shall be inspected and evaluated. The
test pieces shall be randomly selected at the pouring site.
5.5 Prefabricated structural engineering
5.5.1 The connection of prefabricated components shall meet the design requirements
and shall comply with the following regulations.
5.5.2 The joint surface of prefabricated composite components and the joint surface of
prefabricated component connection nodes shall be treated and cleaned according to
the design requirements. Post-cast concrete shall be full and dense.
6 Maintenance and demolition
6.1 General provisions
6.1.1 For concrete structures, it shall establish a structure use and maintenance
management system throughout the life cycle according to the structure type, safety
level and use environment.
6.1.2 A maintenance database and information management platform shall be
established for important concrete structures.
6.1.3 Demolition of concrete structure works shall be schematically designed. Measures
shall be taken to ensure the safety of the dismantling process. The demolition of
prestressed concrete structures shall still analyze the prestressing release procedure.
6.1.4 Demolition of concrete structures shall follow the principles of reduction,
recycling and reusing. A waste disposal plan shall be developed.
6.2 Structure maintenance
6.2.1 Routine maintenance of concrete structures shall check the structural appearance
and load changes. With regard to the appearance of structural components, inspections
shall focus on cracks, deflection, freeze-thaw, corrosion, corrosion of steel bars,
shedding of protective layers, water leakage, uneven settlement, artificial openings,
6.2.2 For concrete structures in harsh environments, a targeted maintenance plan shall
be developed.
6.2.3 When one of the following conditions is met, the structure shall be tested and identified.
6.2.4 When there is any objection to the cement stability of hardened concrete, the
potential hazard of free calcium oxide in cement shall be tested.
6.2.5 The structural performance and safety of the following concrete structures shall
be monitored.
6.2.6 Inspections and system maintenance shall be carried out during the monitoring
period. During special circumstances such as typhoons and floods, the frequency of
monitoring shall be increased.
6.2.7 Concrete structure monitoring shall set monitoring and early warning value. The
monitoring and early warning value shall meet the requirements of engineering design
and control of the monitored objects.
6.2.8 Bridge structures that have exceeded the structural design working life or have a
service life of more than 50 years shall be inspected and evaluated. The testing and
evaluation cycle shall not exceed 10 years.
6.3 Structure disposal
6.3.1 When one of the following situations occurs, measures to eliminate potential
safety hazards shall be taken.
6.3.2 After testing and identification, the structures with potential safety hazards shall
be dealt with by safety management measures.
6.4 Demolition
6.4.1 The structural analysis of the demolition project shall meet the following
requirements.
6.4.2 The demolition operation shall comply with the following regulations.
6.4.3 Measures shall be taken to reduce noise, dust, sewage, vibration, impact and
environmental pollution during demolition operations.
......
Source: Above contents are excerpted from the full-copy PDF -- translated/reviewed by: www.ChineseStandard.net / Wayne Zheng et al.
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