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NATIONAL TECHNICAL REGULATION ON CLASSIFICATIONS OF BUILDINGS AND STRUCTURES FOR DESIGN
TABLE OF CONTENTS
1 GENERAL PROVISIONS
1.1 Scope
1.2 Regulated entities
1.3 Definitions
2 TECHNICAL PROVISIONS
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2.2 Design lifespan of buildings and structures
2.3 Fire-related technical classification of buildings and structures
3 ORGANIZING IMPLEMENTATION
APPENDIX A CONSEQUENCE CLASS OF BUILDINGS AND STRUCTURES
Foreword
The QCVN 03:2022/BXD conforms to Point b Clause 2 Article 5 of Construction Law No. 50/2014/QH13 amended by Clause 3 Article 1 of Law No. 62/2020/QH14 on amendment to Construction Law.
The QCVN 03:2022/BXD is compiled by the Institute of Building Science and Technology, submitted by the Department of Science Technology and Environment, appraised by Ministry of Science and Technology, and promulgated by Ministry of Construction under Circular No. 05/TT-BXD dated November 30, 2022 of the Minister of Construction.
The QCVN 03:2022/BXD replaces the QCVN 03:2012/BXD attached under Circular No. 12/2012/TT-BXD dated December 28, 2012 of the Minister of Construction.
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NATIONAL TECHNICAL REGULATION ON CLASSIFICATIONS OF BUILDINGS AND STRUCTURES FOR DESIGN
1.1.1 This Regulations stipulates classifications of buildings and constructions based on:
a) Consequences caused by damaged or destroyed structure elements (hereinafter referred to as “consequence class”);
b) Design lifespan of buildings and structures;
c) Fire-related technical classifications of buildings and structures (or parts thereof, hereinafter referred to as “structures”), including: fire-resistance category, structural fire risk level, and fire risk category by occupancy.
1.1.2 This Regulation applies to determination of economic-technical solutions for the purpose of designing civil, industrial structures, technical infrastructures, and other buildings.
1.1.3 This Regulation applies to design and construction of structures under 1.1.2 of this document and is recommended for renovation design of existing structures.
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This Regulation applies to organizations and individuals related to construction and investment activities in Vietnamese territory.
Terminologies and definitions below shall, within this document, be construed as follows:
1.3.1
Fire resistance category
Refers to specific categorization of constructions, is defined by fire-resistance category of elements and structures of constructions.
1.3.2
Consequence class
Refers to a specific categorization of constructions, is dependent on occupancies, human casualties, consequences regarding society, environment, and economy caused by damaged or destroyed structures.
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Structural fire risk level
Refers to a characteristic of constructions and is based on level of participation of the structures in development of the fire and formation of dangerous factors of the fire.
1.3.4
Durability
Means the ability of construction to retain integrity, physical properties, and other properties stipulated in the design and guarantee normal operation of constructions throughout their design lifespan.
1.3.5
Structure
Means a combination of parts and elements of constructions which withstands load and force applied to the constructions and ensures stability, integrity, and durability of the constructions.
1.3.6
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Refers to a characteristic of constructions, is defined by occupancies and use properties of the constructions, including properties of production technology in the constructions.
1.3.7
Major repair (of structures)
Means the replacement, reinforcement, restoration of structural parts, elements or foundation reinforcement in order to bring these to normal working conditions.
NOTE: Repair or replacement of enclosing elements, decorations, finishes, protective layers during maintenance is not considered major repair.
1.3.8
Lifespan of construction by design (design lifespan)
Means a duration in which constructions are used and satisfy safety, occupancy requirements without requiring major structural repair.
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2.1.1 Consequence classes of constructions shall be divided into 3 classes: C1 (low), C2 (moderate) and C3 (high), and specified under Appendix A hereof and defined in design and construction tasks.
2.1.2 Structure and foundation of constructions shall be designed in a manner corresponding to consequence classes under this document and selected and applied design standards.
2.1.3 Depending on type of structure and specific situations in design process, it is possible to apply consequence classes of several structural parts, elements that are different from consequence classes of constructions.
2.2 Design lifespan of buildings and structures
2.2.1 Depending on functions of constructions in investment and construction projects, environment of use, and operational period of projects (if any); design lifespan of constructions shall be defined in construction design tasks.
2.2.2 Design lifespan of construction shall be divided into 4 levels according to Schedule 1, individuals deciding investment or project developers may rely on these levels to determine design lifespan of constructions in construction design tasks.
Schedule 1 - Design lifespan of buildings and structures
Level
Design lifespan of buildings and structures 1)
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1
Less than 25 years
Constructions under A.2, Appendix A hereof.
2
No less than 25 years
Constructions directly affected by extreme corrosive environment 2) (chemical, seawater), other than temporary constructions.
3
No less than 50 years
Civil, industrial constructions, technical infrastructures, and other building-type constructions not listed in level 1, level 2, and level 4 of this Schedule.
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No less than 100 years
Unique buildings and constructions with architectural value or of important symbolic meaning (national museums, national exhibit archives, national opera houses, point of interest of unique architecture in administrative divisions and similar constructions).
1) Design lifespan of several structural elements and separate enclosing parts may differ from design lifespan of constructions.
2) Determine by classification of corrosive environment under relevant standards.
2.2.3 Structure of constructions shall be designed in accordance with selected and applied standards in order to ensure durability corresponding to design lifespan of constructions and take into account the following factors:
- Use conditions by occupancies;
- Impact of surrounding environment;
- Properties of materials employed, solutions for protecting them from environmental impact and depreciation of materials.
2.3 Fire-related technical classification of buildings and structures
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NOTE: Definitions relating to fire safety under 2.3 are specified in the QCVN 06:2022/BXD.
2.3.2 Fire-related technical classifications shall be implemented on the basis of:
a) Fire resistance category;
b) Fire risk level of structure;
c) Fire risk category by occupancy.
2.3.3 Fire resistance category of constructions shall consist of 5 categories of I, II, III, IV, and V; depend on number of storey (or fire service height of construction), fire risk category by occupancy, fire compartment area, and fire hazard of technology process within the constructions.
NOTE: In respect of apartment buildings taller than 75 m and public housing taller than 50 m, the QCVN 06:2022/BXD stipulates separate requirements regarding fire-resistance rating of elements and structures.
2.3.4 Fire risk levels of structural elements shall be divided into S0, S1, S2, and S3 depending on fire risks of the elements.
2.3.5 Constructions shall be classified into 5 fire risk categories by occupancy of F1, F2, F3, F4, and F5 depending on use characteristics and threat to human safety in case of fire, taking into account age, physicality, possibility of people sleeping, number of people using primary occupancy.
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3.1 Transition clauses
3.1.1 Investment construction projects that have been approved prior to effective date hereof shall conform to regulations applicable at the time of approval.
3.1.2 Investment construction projects that are approved from the effective date hereof shall conform to this Regulation.
3.1.3 In respect of fire safety, investment construction projects shall carry over in accordance with QCVN of 06:2022/BXD.
3.2 Local construction authorities are responsible for inspecting compliance with this Regulation in production, appraisal, approval, and management of building design and construction.
3.3 Ministry of Construction is responsible for publicizing and providing guidelines on application of this Regulation for relevant entities. Difficulties that arise during the implementation of this Regulation should be reported to the Science - Technology and Environment Department (Ministry of Construction).
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A.1 Constructions of consequence class C3
A.1.1 Assembly constructions
A.1.1.1 Airport terminals (primary terminals).
A.1.1.2 Conference centers, theaters, cultural houses, clubs, movie theaters, circuses, discotheques, similar cultural assembly constructions with total occupancy load of exceeding 1 200 seats.
A.1.1.3 Shopping malls, supermarkets, restaurants, and other similar assembly service and business establishments with multiple storeys and total floor area for business purposes exceeding 30 000 m2.
A.1.1.4 Bleachers of stadiums or outdoor sport arenas (and roofs thereof, if any) with maximum capacity of exceeding 5 000 seats.
A.1.1.5 Sports stadiums with bleachers having total capacity of exceeding 5 000 seats.
A.1.1.6 Hospitals having at least 500 hospital beds.
A.1.2 Constructions potentially causing environmental contamination or economic losses in case of emergencies
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A.1.2.2 Primary constructions in establishments for manufacturing, processing, using, storing, preserving, treating, disposing potentially leaking or detonating dangerous, toxic chemicals.
A.1.2.3 Primary constructions in establishments such as: oil refineries, gas processing plants, gas supply stations (LPG, CNG, LNG), biofuel manufacturing plants, crude oil storage facilities, petroleum storage facilities, liquefied gas storage facilities, liquefied gas refilling stations, gas distribution facilities; gas and oil pipelines that can cause heavy casualties or high economic or environmental losses.
NOTE: LPG stands for Liquefied Petroleum Gas; CNG stands for Compressed Natural Gas; LNG stands for Liquefied Natural Gas.
A.1.2.4 Primary constructions affiliated to thermal power plants of minimum capacity of 150 MW.
A.1.3 Constructions of socio-political importance
A.1.3.1 National Assembly House, Presidential Palace, headquarters of the Government, headquarters of the Central Communist Party.
A.1.3.2 National museums, libraries, galleries, exhibits.
A.1.4 Constructions with large structures
A.1.4.1 Building-type structures of a height exceeding 75 m.
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A.1.4.2 Pillar, tower, mast structures of a height exceeding 75 m.
NOTE: Height of pillar, tower, mast structures shall be calculated from ground elevation or foundation elevation of the constructions, whichever is higher to the top of said structures (not including technical equipment on top of said structures). In respect of constructions located on ground with varying ground elevations, the height shall be calculated from the lowest ground elevation.
A.1.4.3 Tank, silo structures of a height exceeding 75 m or a storage capacity exceeding 15 000 m3.
A.1.4.4 Structures containing spans of a length of exceeding 100 m.
A.1.4.5 Underground structures in civil constructions and technical infrastructures in urban areas of a minimum depth of 18 m.
NOTE: Depth of underground structures shall be calculated from ground elevation to the lowest floor.
A.1.5 Other constructions according to decision of individuals deciding on investment and developers of construction projects
NOTE: Dams, walls, embankments, and pressurizing constructions of similar classifications according to other field-specific standards and regulations.
A.2 Constructions of consequence class C1
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A.2.2 Single-storey buildings serving: temporary accommodation of humans, events, outdoor cultural and service activities of moderate and small scales; temporary processing and manufacturing; temporary storage facilities.
A.2.3 Mobile homes of container type or assembly homes for temporary purposes.
A.2.4 Guard posts, parking garages, tents, temporary fences.
A.2.5 Constructions of other temporary purposes.
A.3 Constructions of consequence class C2
Constructions other than those of class C1 and class C3.
