Detail of GB 55002-2021

Introduction of GB 55002-2021

Codeofchina.com is in charge of this English translation. In case of any doubt about the English translation, the Chinese original shall be considered authoritative. In order to adapt to the general rules of international technical regulations and technical standards, since 2016, the Ministry of Housing and Urban-Rural Development has successively issued documents such as Opinions on furthering the reform of standardization of engineering construction, which put forward the long-term goal for the government to develop mandatory standards and for social organizations to develop voluntary standards and define the reform task of gradually replacing the mandatory provisions scattered in current standards with full-text mandatory engineering construction codes, gradually forming a "technical regulations" system composed of technical provisions in laws, administrative regulations and departmental rules and full-text mandatory engineering construction codes. About the types of codes. The mandatory engineering construction code system covers all kinds of construction projects in the field of engineering construction, namely, engineering project codes (hereinafter referred to as project codes) and general technical codes (hereinafter referred to as general codes). A project code takes the whole engineering construction project as the object, with five major factors, namely, project scale, layout, function, performance and key technical measures, as the main content. A general code takes the general technology of each discipline to meet the function and performance requirements of the engineering construction project as the object, with the general technical requirements such as survey, design, construction, repair and maintenance as the main content. In the full-text mandatory engineering construction code system, the project codes are the core, while the general codes specify the common and general professional key technical measures for all kinds of projects. About the five major factor indicators. The factors in the mandatory engineering construction codes are the basic provisions to ensure the systematization and efficiency improvement of urban and rural infrastructure construction, and the basic requirements to support the high-quality development of urban and rural construction. The scale requirements for a project mainly stipulate that a construction project shall have complete production or service capacity and shall adapt to the level of economic and social development. The layout requirements for the project mainly stipulate the industrial layout, site selection, overall design, general layout and integrated technical requirements coordinated with the scale for the construction project. Reasonable distribution of supply capacity shall be considered to improve the overall level of related facilities construction. The function requirements for the project mainly stipulate the composition and purpose of the project and clarify the basic components of the project, which are the guarantee for the project to play its expected role. The performance requirements for the project mainly stipulate the construction level or technical level of the construction project, reflect the applicability of the construction project, and define the basic levels that the project shall achieve in the aspects of quality, safety, energy conservation, environmental protection, livable environment and sustainable development. Key technical measures are the basic technical regulations for realizing the function and performance requirements of a construction project, and they are the basic guarantee for achieving the development goals of urban and rural construction such as safety, green, resilience, wisdom, livability, fairness and efficiency. About the implementation of codes. Mandatory engineering construction codes have mandatory binding force, which specify the control requirements and bottom lines for ensuring people's life and property safety, personal health, engineering safety, ecological environment safety, public rights and interests as well as promoting energy and resource conservation and meeting economic and social management, and they must be strictly implemented in the whole process of construction activities such as survey, design, construction, acceptance, repair, maintenance and demolition of engineering construction projects. For existing building renovation projects (where existing use functions are not changed), the stringency of the code implemented shall not be inferior to that implemented in construction if the conditions are not available and it is really difficult to implement the current codes. The voluntary engineering construction standards corresponding to the mandatory engineering construction codes are mature technical measures that have been tested by practice and guarantee to meet the requirements of the mandatory codes, and they shall also be implemented under normal circumstances. On the premise of meeting the project function and performance requirements and key technical measures stipulated in mandatory engineering construction codes, relevant group standards and enterprise standards may be reasonably selected to optimize the project function and performance or improve their levels. Voluntary engineering construction standards, group standards and enterprise standards shall be coordinated and match with mandatory engineering construction codes, and all technical requirements shall not be lower than the relevant technical levels of mandatory engineering construction codes. After the implementation of a mandatory engineering construction code, the mandatory provisions in the current national standards and professional standards related to engineering construction shall be abolished at the same time. The mandatory provisions in the current provincial standards for engineering construction shall be revised in time, and shall not be less stringent than the provisions of the mandatory engineering construction codes. If the relevant provisions in current engineering construction standards (including mandatory and voluntary ones) are inconsistent with those of the mandatory engineering construction codes, the provisions of the mandatory engineering construction codes shall prevail. Contents 1 General 1 2 Basic provisions 1 2.1 Performance requirements 1 2.2 Seismic influences 2 2.3 Seismic precautionary category and criterion 3 2.4 Seismic system of engineering 4 3 Seismic precaution of site and subgrade and foundation 6 3.1 Seismic survey of site 6 3.2 Seismic precaution of subgrade and foundation 7 4 Earthquake action and seismic checking 8 4.1 General requirements 8 4.2 Earthquake action 9 4.3 Seismic checking 12 5 Seismic measures of building engineering 14 5.1 General requirements 14 5.2 Buildings of concrete structure 18 5.3 Steel frame buildings 20 5.4 Steel-concrete composite structure buildings 21 5.5 Masonry structure buildings 23 5.6 Wood frame buildings 28 5.7 Earth-stone structure buildings 29 5.8 Combined bearing structure building 31 6 Seismic measures of municipal engineering 33 6.1 Bridges of cities and towns 33 6.2 Urban and rural water supply, drainage, gas and heating engineering 36 6.3 Underground engineering structure 40 1 General 1.0.1 This code is prepared with a view to implementing the national laws and regulations on earthquake prevention and disaster mitigation of buildings and municipal engineering, executing the prevention first policy and reducing the earthquake damage and economic loss and avoiding casualties of buildings and municipal engineering after taking seismic precautionary measures. 1.0.2 All kinds of constructed, extended and renovated buildings and municipal engineering in areas with seismic precautionary intensity of 6 or above must take seismic precautionary measures, and the survey, design, construction, use and maintenance of engineering projects must follow this code. 1.0.3 Whether the technical methods and measures adopted in the engineering construction meet the requirements of this code shall be judged by the relevant responsibility subjects. Innovative technical methods and measures shall be demonstrated and meet the performance requirements in this code. 2 Basic provisions 2.1 Performance requirements 2.1.1 For all kinds of seismic precautionary buildings and municipal engineering, the seismic design objectives shall meet the following requirements: 1 Under frequent earthquakes lower than the precautionary intensity in this area, the main structures and municipal pipe network systems of all kinds of engineering shall not be damaged or shall be serviceable after being repaired. 2 Under fortified earthquake equivalent to the precautionary intensity in this area, buildings, structures, bridge structures, underground engineering structures and so on in all kinds of engineering may be damaged, but they can continue to be used after general repair; the damage of municipal pipe network shall be controlled within a local range and shall not cause secondary disasters. 3 Under rare earthquakes higher than the precautionary intensity in this area, buildings, structures, bridge structures, underground engineering structures and so on in all kinds of engineering will not collapse or cause serious life-threatening damage; the damage of municipal pipe network will not cause serious secondary disasters, and can be quickly restored after emergency repair. 2.1.2 For seismic precautionary buildings and municipal engineering, the exceeding probability level of frequent ground motion, precautionary ground motion and rare ground motion shall not be lower than those specified in Table 2.1.2. Table 2.1.2 Exceeding probability level of ground motion at all levels of buildings and municipal engineering Frequent ground motion Precautionary ground motion Rare ground motion Residential buildings and public buildings, urban bridges, urban water supply and drainage engineering, urban gas and heating engineering, and urban underground engineering structures (excluding urban underground utility tunnel) 63.2%/50 years 10%/50 years 2%/50 years Urban underground utility tunnel 63.2%/100 years 10%/100 years 2%/100 years 2.2 Seismic influences 2.2.1 The seismic precautionary intensity of all kinds of buildings and municipal engineering shall not be lower than that of this area. 2.2.2 The seismic influences suffered by each location shall be characterized by the design basic acceleration of ground motion and the characteristic period corresponding to the seismic precautionary intensity, which shall meet the following requirements: 1 The corresponding relationship between seismic precautionary intensity and design basic acceleration of ground motion in each location shall be in accordance with those specified in Table 2.2.2-1. Table 2.2.2-1 Corresponding relationship between seismic precautionary intensity and design basic acceleration of ground motion in Category II site Seismic precautionary intensity Intensity 6 Intensity 7 Intensity 8 Intensity 9 Design basic acceleration of ground motion in Category II site 0.05 g 0.10 g 0.15 g 0.20 g 0.30 g 0.40 g 2 The characteristic period shall be determined according to the design earthquake group and site category of the engineering location in accordance with 4.2.2 of this code. The design earthquake group shall be determined according to the characteristic period of basic ground motion acceleration response spectrum under Category II site conditions in the current national standard GB 18306 Seismic ground motion parameters zonation map of China in accordance with those specified in Table 2.2.2-2. The type of engineering site shall be determined according to the provisions of 3.1.3 of this code. Table 2.2.2-2 Corresponding relationship between design earthquake group and characteristic period of ground motion acceleration response spectrum in Category II site Design earthquake group Group I Group II Group III Characteristic period of basic ground motion acceleration response spectrum in Category II site 0.35 s 0.40 s 0.45 s 2.3 Seismic precautionary category and criterion 2.3.1 All kinds of seismic precautionary buildings and municipal engineering shall be divided into the following four seismic precautionary categories according to the factors such as casualties, economic losses, social impact and their role in earthquake relief after earthquake damage: 1 Special precautionary category shall refer to the facilities with special use requirements, major buildings and municipal engineering affecting national public safety, and buildings and municipal engineering that need special precaution as they may have serious secondary disasters and other particularly serious disaster consequences during earthquakes, referred to as Category A for short. 2 Key precautionary category shall refer to the lifeline-related buildings and municipal engineering that cannot stop service or need to be restored as soon as possible during earthquakes, and buildings and municipal engineering that need higher precautionary criteria as they may cause great casualties and other major disaster consequences during earthquakes, referred to as Category B for short. 3 Standard precautionary category shall refer to the buildings and municipal engineering fortified according to the standard requirements except paragraphs 1, 2 and 4 of this Sub-clause, referred to as Category C for short. 4 Moderate precautionary category shall refer to the buildings and municipal engineering that allows slightly lower precautionary requirements under certain conditions since they have few working personnel and will not cause secondary disasters after earthquake damage, referred to as Category D for short. 2.3.2 For the buildings and municipal engineering of all seismic precautionary categories, the seismic precautionary criteria shall meet the following requirements: 1 For the standard precautionary category, the seismic measures and earthquake actions shall be determined according to the local seismic precautionary intensity, so as to achieve the seismic design objective of not collapsing or causing serious life-threatening damage under the estimated rare earthquake higher than the local seismic precautionary intensity. 2 For the key precautionary category, higher seismic measures shall be taken according to the requirements for a seismic precautionary intensity one degree higher than the local one; however, when the seismic precautionary intensity is 9, seismic measures shall be taken according to the requirements for a seismic precautionary intensity higher than 9; the seismic measures of subgrade and foundation shall meet the relevant requirements. Meanwhile, the earthquake actions shall be determined according to the local seismic precautionary intensity.

Contents of GB 55002-2021

1 General 2 Basic provisions 2.1 Performance requirements 2.2 Seismic influences 2.3 Seismic precautionary category and criterion 2.4 Seismic system of engineering 3 Seismic precaution of site and subgrade and foundation 3.1 Seismic survey of site 3.2 Seismic precaution of subgrade and foundation 4 Earthquake action and seismic checking 4.1 General requirements 4.2 Earthquake action 4.3 Seismic checking 5 Seismic measures of building engineering 5.1 General requirements 5.2 Buildings of concrete structure 5.3 Steel frame buildings 5.4 Steel-concrete composite structure buildings 5.5 Masonry structure buildings 5.6 Wood frame buildings 5.7 Earth-stone structure buildings 5.8 Combined bearing structure building 6 Seismic measures of municipal engineering 6.1 Bridges of cities and towns 6.2 Urban and rural water supply, drainage, gas and heating engineering 6.3 Underground engineering structure