GB/T 51232-2016Technical standard for assembled buildings with steel-structure (English PDF)

1 General provisions

1.0.1 The document was drawn up to regulate the construction of assembled buildings with steel structure in China, following the requirements of suitability, economy, safety, green performance and good appearance, and to raise across the board the environmental, social and economic benefit of such buildings.

1.0.2 It applies to the design, production and transport, construction and erection, quality acceptance and use and maintenance of assembled buildings with steel structure with a seismic fortification intensity from 6 degrees to 9 degrees.

1.0.3 Assembled buildings with steel structure shall follow the principle of sustainability over the whole life of the building, and shall have standardized design, factory production, assembled construction, integrated fitting-out, information-based management and intelligent application.

1.0.4 Assembled buildings with steel structure shall integrate the structure system, the building envelope system, the facility and pipeline system and the interior decoration system, so that the building function is complete and the performance good.

1.0.5 Apart from this standard, the design, production and transport, construction and erection, quality acceptance and use and maintenance of assembled buildings with steel structure shall also comply with the relevant provisions of the national standards currently in force.

2 Terms

2.0.1 assembled building - building in which the main parts of the structure system, the building envelope system, the facility and pipeline system and the interior decoration system are integrated from prefabricated parts and components.

2.0.2 assembled building with steel-structure - assembled building whose structure system is made up of steel parts and members.

2.0.3 integration of building systems - process by which, on the basis of the assembled manner of building, the planning, design, production and construction are coordinated as a whole so that the structure system, the building envelope system, the facility and pipeline system and the interior decoration system of the building are made one.

2.0.4 integrated design - design that makes one whole of the structure system, the building envelope system, the facility and pipeline system and the interior decoration system of the building.

2.0.5 collaborative design - integrated design in which, in the design of an assembled building, the architectural, structural, mechanical and fitting-out disciplines work together and information technology is used to meet the requirements of building design, production and transport, construction and erection and the like.

2.0.6 structure system - whole assembled from structural members through reliable connection methods so as to carry or transfer the action of loads.

2.0.7 building envelope system - whole made up of parts and components such as the external walls, the roof, the external doors and windows and others, used to separate the indoor from the outdoor environment of the building.

2.0.8 facility and pipeline system - whole made up of the equipment and pipelines of water supply and drainage, heating, ventilation and air conditioning, electrical and intelligent systems and gas, meeting the functional use of the building.

2.0.9 interior decoration system - whole made up of the floor surfaces, wall surfaces, lightweight partition walls, suspended ceilings, internal doors and windows, kitchen and bathroom and the like, meeting the requirements for the use of the building space.

2.0.10 component - collective name for the structural members and other members that make up the structure system of the building and are produced and made in advance in a factory or on site.

2.0.11 part - collective name for the functional units assembled from single building products or composite products produced in a factory, which make up the building envelope system, the facility and pipeline system and the interior decoration system.

2.0.12 decorated - state in which the fixed surface finishing of all functional spaces and the installation of all equipment and facilities are complete, so that the functional use and the performance of the building are attained.

2.0.13 assembled decoration - manner of fitting out in which interior parts produced in a factory are assembled and installed on site by non-wet construction.

2.0.14 non-wet construction - method of building carried out by dry working.

2.0.15 module - unit in a building that is relatively independent, has a particular function and can be interchanged generally.

2.0.16 standardized interface - interface that has uniform dimensional specifications and parameters and satisfies tolerance fitting and modular coordination.

2.0.17 integrated kitchen - kitchen assembled mainly by non-wet construction from integrated factory-produced floor, suspended ceiling, wall surfaces, cabinets, kitchen equipment and pipelines.

2.0.18 integrated bathroom - bathroom assembled mainly by non-wet construction from integrated factory-produced floor, wall surfaces or panels, suspended ceiling, sanitary fittings, equipment and pipelines.

2.0.19 system cabinet - modular part produced in a factory and assembled on site, meeting storage needs.

2.0.20 assembled partition wall, ceiling and floor - partition walls, suspended ceilings and floors assembled mainly by non-wet construction from factory-produced integrated parts that have sound insulation, fire protection, damp-proofing and other properties and that satisfy the spatial function and aesthetic requirements.

2.0.21 pipe and wire detached from structure system - manner in which the equipment and pipelines are placed outside the structure system.

2.0.22 same-floor drainage - manner of drainage in a building drainage system in which the appliance drain pipes and the drainage branch pipes do not pass through the structural floor of the storey into the space below, but are laid on the same floor as the sanitary appliances and connected into the drainage stack.

2.0.23 steel frame structure - structure with shear and bending capacity, formed by rigidly connecting steel beams to steel columns or to concrete-filled steel tubular columns.

2.0.24 steel braced frame structure - structure made up of a steel frame and steel bracing members, able to carry vertical and horizontal actions together; steel bracing is divided into concentric bracing, eccentric bracing and buckling-restrained bracing, among others.

2.0.25 steel frame structure with refined ductility shear wall - structure made up of a steel frame and ductile wall panel members, able to carry vertical and horizontal actions together; ductile wall panels include stiffened steel plate shear walls and concrete shear walls with vertical slits, among others.

2.0.26 staggered truss framing structure - structure in which plane trusses are placed at each storey on each transverse axis of the building and are staggered on adjacent axes.

2.0.27 composite slabs with steel bar truss deck - composite slab formed by casting concrete on a steel bar truss deck.

2.0.28 composite slabs with profiled steel sheet - composite slab formed by casting concrete on profiled steel sheet.

2.0.29 light-weight building with gabled frames - single-storey building structure whose load-bearing structure uses solid-web rigid frames of varying or constant cross section.

2.0.30 low-rise cold-formed thin-walled steel buildings - low-rise building structure with cold-formed thin-walled steel sections as the main load-bearing members, of not more than 3 storeys and with an eaves height of not more than 12 m.

3 Basic requirements

3.0.1 Assembled buildings with steel structure shall use the method of system integration to coordinate design, production and transport, construction and erection and use and maintenance as a whole, so that the whole process is carried out in concert.

3.0.2 Assembled buildings with steel structure shall follow the requirements of generalisation, modularisation and standardisation and, on the principle of few specifications and many combinations, shall achieve a range and a variety of buildings and of parts and components.

3.0.3 The factory production of parts and components shall have a complete production quality management system in place, shall provide product identification, shall raise production accuracy and shall secure product quality.

3.0.4 Assembled buildings with steel structure shall coordinate the architectural, structural, mechanical, interior decoration and other disciplines as a whole, shall draw up a construction organisation scheme in which they work in concert and shall use assembled construction, so that the quality of the works is secured and labour efficiency raised.

3.0.5 Assembled buildings with steel structure shall be fully decorated, and the interior decoration system shall be designed and built as one with the structure system, the building envelope system and the facility and pipeline system.

3.0.6 Assembled buildings with steel structure should use building information modelling (BIM) technology, so as to achieve information-based management across all disciplines and the whole process.

3.0.7 Assembled buildings with steel structure should use intelligent technology, so as to raise the safety, convenience, comfort and environmental performance of the building in use.

3.0.8 Assembled buildings with steel structure shall undergo technical planning, in which the choice of technology, the technical and economic feasibility and the buildability are assessed, and the building objectives and the technical implementation scheme shall be settled scientifically and reasonably.

3.0.9 Assembled buildings with steel structure shall use green building materials and parts and components of good performance, so as to raise the overall performance and quality of the building.

3.0.10 The fire protection and the corrosion protection of assembled buildings with steel structure shall comply with the provisions of the relevant national standards in force and shall satisfy the requirements on reliability, safety and durability.

4 Architectural design

4.1.1 Assembled buildings with steel structure shall be modularly coordinated, shall use modular and standardized design and shall integrate the structure system, the building envelope system, the facility and pipeline system and the interior decoration system.

4.1.2 Assembled buildings with steel structure shall follow the principle of integrated design, with collaborative design between the architectural, structural, water supply and drainage, heating, ventilation and air conditioning, electrical, intelligent systems, gas and other disciplines.

4.1.3 The design of assembled buildings with steel structure should set up an information-based collaboration platform on which data are shared, so that the whole construction process is managed and controlled.

4.1.4 Assembled buildings with steel structure shall meet the requirements of use and maintenance over the whole life of the building, and the manner of detaching the pipes and wires from the structure system should be used.

4.2.1 Assembled buildings with steel structure shall comply with the comprehensive provisions of the national standards in force on the serviceability, safety, environmental, economic and durability performance of buildings.

4.2.2 The fire resistance grade of assembled buildings with steel structure shall comply with the relevant provisions of the current national standard GB 50016 Code for fire protection design of buildings.

4.2.3 Steel members shall be given a corrosion protection design according to the environmental conditions, the material, the location, the structural performance, the requirements of use, the construction conditions and the maintenance and management conditions, and shall comply with the relevant provisions of the current trade standard JGJ/T 251 Technical specification for corrosion protection of steel structures of buildings.

4.2.4 Assembled buildings with steel structure shall be given a sound insulation design according to the functional location and the requirements of use; at locations where sound bridges readily form, flexible connections, indirect connections or similar measures shall be used, and the relevant provisions of the current national standard GB 50118 Code for design of sound insulation of civil buildings shall be complied with.

4.2.5 The thermal performance of assembled buildings with steel structure shall comply with the relevant provisions of the current national standards GB 50176 Code for thermal design of civil building, GB 50189 Design standard for energy efficiency of public buildings, JGJ 26 Design standard for energy efficiency of residential buildings in severe cold and cold zones, JGJ 134 Design standard for energy efficiency of residential buildings in hot summer and cold winter zone and JGJ 75 Design standard for energy efficiency of residential buildings in hot summer and warm winter zone.

4.2.6 Assembled buildings with steel structure shall meet the requirements on floor comfort, which shall be carried out in accordance with clause 5.2.18 of this standard.

4.3.1 The design of assembled buildings with steel structure shall comply with the relevant provisions of the current national standard GB/T 50002 Standard for modular coordination of building.

4.3.2 The bay and column spacing, the depth and span, and the width of door and window openings of assembled buildings with steel structure should use the horizontal enlarged modular series 2nM and 3nM, n being a natural number.

4.3.3 The storey height and the height of door and window openings of assembled buildings with steel structure should use the vertical enlarged modular series nM.

4.3.4 The cross-sectional dimensions of components such as beams, columns, walls and slabs should use the vertical enlarged modular series nM.

4.3.5 The dimensions of construction joints and of the interfaces of parts and components should use the sub-modular series nM/2, nM/5 and nM/10.

4.3.6 The preferred dimensions of the bay, depth, storey height and openings of assembled buildings with steel structure shall be settled according to the building type, the functional use and the production and assembly requirements of the parts and components.

4.3.7 The tolerance coordination of the dimensions and of the installation positions of parts and components shall be settled according to the production and assembly requirements, the interstorey deformation of the main structure, the deformation capacity of the sealing material, the drying shrinkage of the material, the deformation due to temperature difference and the construction error.

4.4.1 Assembled buildings with steel structure shall use standardized design on the basis of modular coordination, so as to raise the general applicability of the parts and components.

4.4.2 Assembled buildings with steel structure shall use design methods based on modules and on module combinations, following the principle of few specifications and many combinations.

4.4.3 Public buildings shall use combination design of modules such as staircases and lifts, public lavatories, public service shafts and basic units.

4.4.4 Residential buildings shall use combination design of modules such as staircases and lifts, public service shafts, integrated kitchens and integrated bathrooms.

4.4.5 The parts and components of assembled buildings with steel structure shall use standardized interfaces.

4.5.1 The design of the plan and space of assembled buildings with steel structure shall meet the requirements on the arrangement of the structural members, the combination of the basic elements of the elevation and buildability.

4.5.2 Assembled buildings with steel structure shall use a structural arrangement with large bays and large depths and with flexibly variable space.

4.5.3 The plan design of assembled buildings with steel structure shall satisfy the following provisions: (1) the arrangement of the structural column grid, of the lateral force resisting members and of the secondary beams shall be coordinated with the layout of the functional spaces and with the door and window openings; (2) the plan geometry should be regular and even and should be laid out on the basis of continuous column spans, and the column spacing dimensions shall be unified by module; (3) the service shafts should be combined with the staircases and lifts and grouped together.

4.5.4 The elevation design of assembled buildings with steel structure shall satisfy the following provisions: (1) parts and components such as the external walls, balcony slabs, air conditioner slabs, external windows, shading facilities and decoration should be given standardized design; (2) a rich and varied elevation effect should be formed through variation of the building volume, the material texture and the colour.

4.5.5 Assembled buildings with steel structure shall settle reasonable storey height and clear height dimensions according to the building function, the main structure, the equipment and pipelines and the fitting-out requirements.

5 Integrated design

5.1.1 The structure system, the building envelope system, the facility and pipeline system and the interior decoration system of the building shall all be given integrated design, so as to raise the degree of integration, the accuracy of construction and the efficiency.

5.1.2 The design of each system shall take into account as a whole the requirements of material performance, working process, transport limits and lifting capacity.

5.1.3 The structure system of assembled buildings with steel structure shall be designed on the principles of reliable force transfer, simple construction, convenient building work and secured durability.

5.1.4 The building envelope system of assembled buildings with steel structure should use lightweight materials and should use non-wet construction.

5.1.5 The facility and pipeline system of assembled buildings with steel structure shall be convenient to inspect, repair and replace, and repair and replacement shall not affect the safety of the structure.

5.1.6 The interior decoration system of assembled buildings with steel structure shall use assembled decoration, and interior parts with general applicability and interchangeability should be selected.

5.2.1 The structural design of assembled buildings with steel structure shall satisfy the following provisions: (1) the structural design shall comply with the provisions of the current national standard GB 50153 Unified standard for reliability design of engineering structures, the design working life of the structure shall not be less than 50 years and its safety class shall not be lower than class two; (2) the characteristic values of the loads and effects, the partial factors for the loads, the combinations of load effects and the combination value coefficients of assembled buildings with steel structure shall comply with the provisions of the current national standard GB 50009 Load code for the design of building structures; (3) the seismic fortification category of assembled buildings with steel structure shall be settled in accordance with the provisions of the current national standard GB 50223 Standard for classification of seismic protection of building constructions, and the seismic design shall be carried out in accordance with the current national standard GB 50011 Code for seismic design of buildings.

Status of this standard

Announcement No. 1418 of the Ministry of Housing and Urban-Rural Development, dated 10 January 2017 and reproduced in the front matter, approves the Technical standard for assembled buildings with steel-structure as a national standard numbered GB/T 51232-2016, to take effect on 1 June 2017. The prefix GB/T makes it a recommended standard.

The foreword states that the standard was drawn up under the letter of the General Office of the Ministry of Housing and Urban-Rural Development on the drawing up of three standards including a technical code for assembled concrete structure buildings (Jianbanbiaohan [2016] No. 909), and that its main technical content covers general provisions, terms, basic requirements, architectural design, integrated design, production and transport, construction and erection, quality acceptance, and use and maintenance. The Ministry of Housing and Urban-Rural Development administers it, and China Institute of Building Standard Design and Research Co., Ltd. is responsible for interpreting its specific technical content.

The front matter of this copy carries no supersession line of the kind that names a replaced code, so no superseded code is recorded.

Note on the year in the standard number and on the pages of this copy

The number of the standard carries the year 2016 while the ministerial announcement approving it, printed in the same volume, is dated 10 January 2017 and the implementation date is 1 June 2017. The document is reproduced here as it is printed, with the number GB/T 51232-2016 and the issue date of 10 January 2017.

The pages available for this copy are the front matter and printed pages 1 to 10 of the body. The contents pages are not among them, so the table of contents above carries no page numbers: it lists the nine chapters named in the foreword together with the section headings read on the body pages available. Chapters 6 to 9, on production and transport, construction and erection, quality acceptance, and use and maintenance, are named in the foreword only; no text of them is reproduced above.