1、BSI Standards PublicationLibrary objects for architecture, engineering and construction Part 5: Assemblies Code of practiceBS 8541-5:2015BS 8541-5:2015 BRITISH STANDARDPublishing and copyright informationThe BSI copyright notice displayed in this document indicates when the document was last issued.
2、 The British Standards Institution 2015 Published by BSI Standards Limited 2015ISBN 978 0 580 85274 9ICS 01.100.30; 03.100.50The following BSI references relate to the work on this document: Committee reference B/555 Draft for comment 14/30294736 DCPublication historyFirst published, March 2015Amend
3、ments issued since publicationDate Text affected The British Standards Institution 2015 iBS 8541-5:2015BRITISH STANDARDContentsForeword iiIntroduction 11 Scope 22 Normative references 23 Terms and definitions 24 Assembly related processes 35 Implementation 4AnnexesAnnex A (informative) Use cases 7An
4、nex B (informative) COBie examples 8Annex C (informative) IFCXML examples 11Annex D (informative) IFC examples 13Bibliography 15List of figuresFigure 1 Core maturity model iiiFigure 2 The assembly relationship 3Figure 3 An assembly is a Type within a construction object library and a Component (occu
5、rrence) within a Facility model 3List of tablesTable 1 Expected content of overall assemblies 4Table 2 Expected content of constituent parts 4Table B.1 Component 8Table B.2 Assembly 9Table B.3 Coordinate 9Table B.4 Types 10Table B.5 Assembly 10Table B.6 Coordinate sheet 10Summary of pagesThis docume
6、nt comprises a front cover, an inside front cover, pages i to iv, pages 1 to 16, an inside back cover and a back cover.BS 8541-5:2015ii The British Standards Institution 2015BRITISH STANDARDForewordPublishing informationThis part of BS 8541 is published by BSI Standards Limited, under licence from T
7、he British Standards Institution, and came into effect on 31 March 2015. It was prepared by Technical Committee B/555, Construction design, modelling and data exchange. A list of organizations represented on this committee can be obtained on request to its secretary.Relationship with other publicati
8、onsBS 8541 comprises six parts as follows: Part 1, Identification and classification Part 2, Recommended 2D symbols of building elements for use in building information modelling Part 3, Shape and measurement Part 4, Attributes for specification and assessment Part 5 (this part), Assemblies Part 6,
9、Product and facility declarationsBS 8541-1, BS 8541-3 and BS 8541-4 document best practice for the development and application of construction library objects to support Building Information Modelling (BIM) based design, standardization, specification and construction processes. See BS 8541-1 and Fi
10、gure 1.BS 8541-2 documents best practice for the use of 2D symbols for construction objects. BS 8541-5 and BS 8541-6 document best practice for the transmission of assemblies of construction objects and for the transmission of formal product declarations of product performance. The IFC standard (BS
11、ISO 16739) includes recommendations for the association of sets of attributes to objects. The use of the IFC standard can be supplemented by using UK-specific recommendations, such as are referenced in BS 1192-4:2014, Clause 7. The British Standards Institution 2015 iiiBS 8541-5:2015BRITISH STANDARD
12、Figure 1 Core maturity modelNOTE The BIM reports and an updated Roadmap are maintained by B/5551).Use of this document1)As a code of practice, this part of BS 8541 takes the form of guidance and recommendations. It should not be quoted as if it were a specification and particular care should be take
13、n to ensure that claims of compliance are not misleading.Any user claiming compliance with this part of BS 8541 is expected to be able to justify any course of action that deviates from its recommendations.Presentational conventionsThe provisions of this standard are presented in roman (i.e. upright
14、) type. Its recommendations are expressed in sentences in which the principal auxiliary verb is “should”.Commentary, explanation and general informative material is presented in smaller italic type, and does not constitute a normative element.1)http:/ viewed: 24-3-2015BS 8541-5:2015iv The British St
15、andards Institution 2015BRITISH STANDARDThe word “should” is used to express recommendations of this standard. The word “may” is used in the text to express permissibility, e.g. as an alternative to the primary recommendation of the clause. The word “can” is used to express possibility, e.g. a conse
16、quence of an action or an event.Notes and commentaries are provided throughout the text of this standard. Notes give references and additional information that are important but do not form part of the recommendations. Commentaries give background information.Contractual and legal considerationsThis
17、 publication does not purport to include all the necessary provisions of a contract. Users are responsible for its correct application.Compliance with a British Standard cannot confer immunity from legal obligations. The British Standards Institution 2015 1BS 8541-5:2015BRITISH STANDARDIntroductionT
18、he use of assemblies is rising in response to client interest in reusable design elements, and in design for manufacturing and assembly (“dfma”), and in better facility management of assets.Assemblies might represent standard configurations intended for reuse between projects, products intended for
19、off-site manufacture, and examples of products in context or other reusable design configurations. Assemblies might have internal connections and potential connections into the overall design.The transmission of information about assemblies is different from that about facilities or individual produ
20、cts, especially when both the overall assembly and the constituent parts have significance in the management of the design, construction and use. In particular, attention might switch between the overall assembly and the constituent parts, which might affect processes such as material take-off.Examp
21、les where assemblies are used include:Design: predesigned aspects and complex system solutions; repetitive building types and cumulative design knowledge; and standard design configurations (such as space with equipment)Construction: prefabrication and items manufactured off site; recommended detail
22、s and connections; and layered constructions and layered setsOperations: engineered-to-order solutions; standard furniture schedules; and asset groupings.BS 8541-5:20152 The British Standards Institution 2015BRITISH STANDARD1 ScopeThis part of BS 8541 gives recommendations covering the transmitting
23、of assemblies of construction library objects for use throughout both the “project” and “in-use” life cycle stages. It applies to the provision of generic objects and manufacturers specific products. It is intended to ease the communication between parties whether or not they are contractually relat
24、ed.It also gives recommendations for the application of assemblies in integrated BIM working. It defines the level of information appropriate for specific uses such as: specification, comparison and selection; coordination; take-off; and asset management.This part of BS 8541 builds on Part 1 and com
25、plements Parts 2 to 4.NOTE 1 Testing is by compliance with these earlier parts, with additional rules implied by the specific requirements.BS ISO 16739 IFC and IFCXML are used as example formats with reference to BS ISO 10303-21 (STEP physical file) and ISO 10303-28 (XML representation). COBie examp
26、les are included.NOTE 2 Concepts reflected in the COBie sheet names are capitalized, such as Component and Type. See BS 1192-4 for definitions.2 Normative referencesThe following documents, in whole or in part, are normatively referenced in this document and are indispensable for its application. Fo
27、r dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies.BS 8541-1, Library objects for architecture, engineering and construction Part 1: Identification and classification Code of practiceBS 8541-2,
28、Library objects for architecture, engineering and construction Part 2: Recommended 2D symbols of building elements for use in building information modellingBS 8541-3, Library objects for architecture, engineering and construction Part 3: Shape and measurement Code of practiceBS 8541-4, Library objec
29、ts for architecture, engineering and construction Part 4: Attributes for specification and assessment Code of practice3 Terms and definitionsFor the purposes of this part of BS 8541, the following terms and definitions apply.3.1 assemblypartial model where both the overall assembly and the constitue
30、nt parts are managed during design, construction or use, and the constituent parts are located relative to the overall assemblyNOTE See Figure 2 and Figure 3. The British Standards Institution 2015 3BS 8541-5:2015BRITISH STANDARDFigure 2 The assembly relationshipFigure 3 An assembly is a Type within
31、 a construction object library and a Component (occurrence) within a Facility model4 Assembly related processesNOTE This clause gives recommendations for the process involved in the preparation and use of assemblies.4.1 Preparation and publicationInformation suppliers such as library providers, manu
32、facturers, detailers and designers should prepare construction library objects representing assemblies to support the management of their subsequent design, installation and use.Assemblies should be shared and published as other construction library objects.4.2 Design and development Assemblies shou
33、ld be incorporated into facility designs through the steps of selection, insertion or substitution and subsequent development. The process of specification, comparison and selection should be similar to any other construction library object.BS 8541-5:20154 The British Standards Institution 2015BRITI
34、SH STANDARDAssemblies should retain their structure when incorporated, keeping both the overall assembly and their constituent parts accessible. Both the overall assembly and the constituent parts with all positioning and attributes should be:a) visible in plans and other views;b) scheduled in repor
35、ts and tables; andc) documented fully when mapped to and from IFC, COBie or other information exchange formats.NOTE Where BIM authoring tools can represent assemblies it might be necessary to check that export and import functionality preserves the assembly information.4.3 Coordination and construct
36、ionApplications should analyse either one or both levels of detail.NOTE Unless there is clarity as to whether either one or both levels of detail are being analysed, there might be ambiguity or error in the coordination and material take-off processes.4.4 Use in facilities management (FM)Information
37、 about an assembly should be offered for use in facility management with both the overall assembly and its constituent parts.NOTE Some receiving applications might not retain information about the constituent parts or the overall assembly.5 ImplementationNOTE The recommendations given in 5.1 to 5.3
38、are applicable to both product objects and generic objects, but not to template objects.5.1 GeneralBoth the overall assembly and the constituent parts should be identified and have relevant groupings associated.NOTE It might not be necessary for the overall assembly to have a symbol or shape (see Ta
39、ble 1), and it might not be necessary for the constituent parts to have specifying properties (see Table 2).Table 1 Expected content of overall assembliesIdentification and grouping (5.2)Symbol and shape (5.2.2 and 5.2.3)Properties (5.2.4)Template objects Not applicable Not applicable Not applicable
40、Generic objects Tick Optional TickProduct objects Tick Optional TickTable 2 Expected content of constituent partsIdentification and grouping (5.2)Symbol and shape (5.2.2 and 5.2.3)Properties (5.2.4)Template objects Not applicable Not applicable Not applicableGeneric objects Tick Tick OptionalProduct
41、 objects Tick Tick Optional The British Standards Institution 2015 5BS 8541-5:2015BRITISH STANDARD5.2 Identification and grouping5.2.1 GeneralAs a construction library object an assembly should function within applications as a Type, and should function as a Component when inserted into Facility mod
42、els. Both the overall assembly and any constituent parts should be distinct construction library objects with appropriate naming, description, authorship and classification. NOTE 1 See BS 8541-1.The assembly should be named and described based on the overall assembly, unless there is a dominant cons
43、tituent, as when a single product shown in its context.The applicability of the overall assembly should be clearly identified in its description.In order to ensure accurate scheduling and selection, any classification given to the overall assembly should reflect the range of classifications of the c
44、ontained parts by classifying the overall assembly at a more general level.The overall assembly should be separable from all of the constituent parts by means of this classification(s) or other means.NOTE 2 It might also be possible to anticipate the assignment of the overall assembly and the consti
45、tuent parts to systems and zones within a facility.NOTE 3 See BS 1192, PAS 1192-2 and PAS 1192-3 for layer naming and classification.5.2.2 SymbolsFor efficient drawing production, both the overall assembly and the constituent parts should be given symbols that do not conflict. The overall assembly s
46、hould suffice as a symbol, as should the symbols on all the constituent parts.NOTE 1 The provision of a symbol on the overall assembly is optional.NOTE 2 See BS 8541-2 for more details.5.2.3 Shape and measurementFor coordination, both the overall assembly and the constituent parts should be given sh
47、apes and measures that do not conflict.Assemblies should be provided with geometric shapes to the level of detail required for recognition and coordination, but not for manufacturing.Any shape of the overall assembly should suffice, as should the shape on all of the constituent parts.NOTE 1 The prov
48、ision of shape on the overall assembly is optional.Measure quantities should be applied to the constituent parts.NOTE 2 The provision of aggregate measure quantities on the overall assembly is optional.NOTE 3 See BS 8541-3 for more details.5.2.4 PropertiesCharacteristic properties should be assigned
49、 to the overall assembly.NOTE 1 The provision of properties on the constituent parts is optional.NOTE 2 See BS 8541-4 for more details.BS 8541-5:20156 The British Standards Institution 2015BRITISH STANDARD5.2.5 CompositionThe constituent parts should be construction library objects (not just symbols). NOTE 1 Objects representing spaces may also be included. NOTE 2 Some sending and receiving applications disallow some variants of their components and/or spaces from being the
