1、raising standards worldwideNO COPYING WITHOUT BSI PERMISSION EXCEPT AS PERMITTED BY COPYRIGHT LAWBSI Standards PublicationLibrary objects for architecture, engineering and construction Part 4: Attributes for specification and assessment Code of practiceBS 8541-4:2012BS 8541-4:2012Publishing and copy
2、right informationThe BSI copyright notice displayed in this document indicates when the document was last issued. The British Standards Institution 2012 Published by BSI Standards Limited 2012ISBN 978 0 580 74146 3ICS 01.100.30The following BSI references relate to the work on this standard: Committ
3、ee reference B/555 Draft for comment 12/30240259 DCPublication historyFirst (present) edition September 2012Amendments issued since publicationDate Text affected The British Standards Institution 2012 iBS 8541-4:2012ContentsForeword iii1 Scope 12 Normative references 13 Terms and definitions 14 Spec
4、ification and simulation for construction library objects 25 Use of level of attributing 3AnnexesAnnex A (informative) COBie 2.4 presentation 6Annex B (informative) ISO 10303-28 “XML” format 7Annex C (informative) BS ISO 10303-21 “STEP file” format 9Annex D (informative) Attribute sets 9Bibliography
5、 12List of figuresFigure 1 Core maturity model ivList of tablesTable 1 Expected levels of attributing for construction library objects 3Table A.1 COBie attribute sheet 6Table A.2 COBie impact sheet 6Table A.3 COBie attribute sheet 6Table D.1 Example of expected IFC attribute sets 10Summary of pagesT
6、his document comprises a front cover, an inside front cover, pages i to iv, pages 1 to 12, an inside back cover and a back cover.BS 8541-4:2012ii The British Standards Institution 2012This page deliberately left blank The British Standards Institution 2012 iiiBS 8541-4:2012ForewordPublishing informa
7、tionThis part of BS 8541 is published by BSI Standards Limited, under licence from The British Standards Institution, and came into effect on 30September 2012. It was prepared by Technical Committee B/555, Construction design, modelling and data exchange. A list of organizations represented on this
8、committee can be obtained on request to its secretary.Relationship with other publicationsBS 8541 comprises four parts as follows: Part 1, Identification and grouping Part 2, Recommended 2D symbols of building elements for use in building information modelling Part 3, Shape and measurement Part 4 (t
9、his part), Attributes for specification and assessmentBS 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,
10、 see BS 8541-1:2012, 0.4 and Figure 1.The IFC standard (ISO/PAS 16739) includes recommendations for the association of base quantities and geometry for objects. The use of the IFC standard can be supplemented by using UK specific recommendations, such as are published by buildingSMART UK on behalf o
11、f RIBAE NBS under its UK national BIM Library initiative. For further information on work within ISO, see BS 8541-1:2012, Clause 0.Use of this documentAs 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
12、 particular care should be taken 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 in this standard are p
13、resented in roman (i.e. upright) 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.The word “should” is used
14、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 consequence of an action or an event.Notes and commentaries are provide
15、d 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 publication does not purport to include all the necessary provisi
16、ons of a contract. Users are responsible for its correct application.Compliance with a British Standard cannot confer immunity from legal obligations.BS 8541-4:2012iv The British Standards Institution 2012Figure 1 Core maturity modelNOTE 1 Reproduced with kind permission of Mark Bew and Mervyn Richa
17、rds.NOTE 2 The BIM reports and an updated Roadmap are maintained by B/555 1)1)1)Available at http:/ The British Standards Institution 2012 1BS 8541-4:20121 ScopeThis part of BS 8541 builds on the recommendations in BS 8541-1 to cover purposes for specifying and assessing attributes for construction
18、library objects for use in the building construction and facility industry. It applies to the design of generic objects and manufacturers specific products.This British Standard gives recommendations for the application of construction objects in integrated BIM working for specification and selectio
19、n. It defines the level of information appropriate for specific uses including specification of the desired outcome (typically by designers and engineers) and the selection of identified products (typically by contractors and sub-contractors). It covers both common attributes (colour, material, fini
20、sh, etc.) and examples of specific attributes (fire resistance, etc.). It also gives recommendations for the assessment of expected impacts.Where a project is formally committed to integrated working, this British Standard may be adopted as a requirement on the design team and/or the procurement cha
21、in. For other situations, this British Standard gives recommendations of best practice.2 Normative referencesThe following referenced documents are indispensable for the application of this document. For dated references, only the edition cited applies. For undated references, the latest edition of
22、the referenced document (including any amendments) applies.BS 8541-1:2012, Library objects for architecture, engineering and construction Part 1: Identification and classification Code of practiceBS ISO 80000-1, Quantities and units Part 1: General3 Terms and definitionsFor the purposes of this part
23、 of BS 8541, the terms and definitions given in BS 8541-1 and the following apply.3.1 object3.1.1 template objecttype object intended to guide the production of generic objects and product objects by providing schedules of classification values and a minimum set of attributesNOTE Typically the measu
24、rement type is specified, but the values are not.3.1.2 generic objecttype object intended for use in stages of design when the object is not resolved into a product3.1.3 product objecttype object intended to represent an obtainable product, either as a requirement or exemplar or as-built3.1.4 type (
25、library) objectrepresentation of the common features of a product or group, including its classifications and propertiesNOTE 1 It can be a template object, generic object or product object.NOTE 2 It is independent of any occurrence, and has no placement in space. It can represent a template, generic
26、 or product object.3.1.5 occurrence objectrepresentation of an actual occurrence (instance) of an object in a buildingBS 8541-4:20122 The British Standards Institution 20123.2 level of attributingcategorization based on a minimum content of attributing information on a library objectNOTE Identificat
27、ion and classification are covered in BS 8541-1; shape and measurement are assessed in BS 8541-3.3.3 specificationidentification of the requirements on objects including the subsequent the selection of products during installation and replacement4 Specification and simulation for construction librar
28、y objects4.1 Levels of attributing4.1.1 GeneralThe level of attributing of library objects should be determined by their intended uses.For construction object templates, the measurement type of the attribute should be defined. Preferences for particular units should be included in the attribute desc
29、ription.Generic and proprietary library objects should have the same attributes defined.NOTE 1 This allows enhanced management of the product selection and comparison processes.For generic objects and products, units should be named for any numeric attribute. Units for angle, length, area, volume an
30、d mass should be used consistently across attribute, shape and measurement.Units of measure should be named in accordance with BS ISO 80000-1.NOTE 2 IFC provides guidance on the generic property sets, attributes and units of measure for many object types.Attributes should be named in camelcase and s
31、hould indicate the data type expected.NOTE 3 The reason for this is to ensure that internal and external databases are able to represent property names unambiguously4.1.2 Specification level of attributingA library object should be characterized by attributes sufficient to select and replace the obj
32、ect without reference to external data sets.NOTE Typically these attributes are identified in the specifications and schedules prepared by consultants, contractors and maintainers.4.1.3 Assessment level of attributing A library object should be characterized by attributes sufficient to assess the ob
33、jects economic and environmental impacts without reference to external data sets. Assessment may include initial (embedded) impacts or life-cycle (in-use and end-of-life) impacts.NOTE See BS EN 15804, BS EN 15978 and BS ISO 15686-6 and local or national assessment practice. The British Standards Ins
34、titution 2012 3BS 8541-4:20124.1.4 Simulation level of attributing To support simulation, a library object should be characterized by its performance attributes.5 Use of level of attributing5.1 GeneralA library object should be characterized by attributes, with a level of attributing appropriate to
35、its intended uses.NOTE 1 The use of the levels of attributing are summarized in Table 1.Table 1 Expected levels of attributing for construction library objectsSpecification Assessment SimulationTemplate objects required optional optionalGeneric objects required optional optionalProduct objects requi
36、red required optionalNOTE 2 See A.2, B.2 and C.2 to C.4 for attributing examples.5.1.1 Library object types Library templates and generic library objects should have the specification level of attributes; values might not be necessary, and some may have suggested values, with technical guidance on t
37、hese options.NOTE 1 Example use of a generic object:Pedestal wash basinManufacturer Contractors choiceModel XX_001, XX_002, XX_003, YY_A, YY_B, ZZ_1Standard BS 1188Form Full pedestalSize 540 410 mmNOTE 2 Example use of a product object:Pedestal wash basinManufacturer XXModel XX_002Form Full pedestal
38、 Full pedestal corner basin Semi pedestal Semi pedestal corner basinMaterials Body Stainless steel Vitreous china to BS 3402 Colour and finish Polished Self finished White Size 540 410 mm 560 440 mm 600 465 mmBS 8541-4:20124 The British Standards Institution 2012Water supply, overflow and waste hole
39、s. Water supply Single taphole, centred Single taphole, offset Two tapholes None Overflow Rear overflow hole None Waste Chainstay holeProducts should have the specifying and assessment level of attributes with values provided; some may have suggested values with technical guidance on these options.N
40、OTE 3 Example of a manufacturers library object:Pedestal wash basinManufacturer XX Model XX_002 Standard BS EN 14688 Form Full pedestal. Materials Body Vitreous china to BS 3402 Colour and finish White Size 540 410 mm Water supply, overflow and waste holes Water supply Single taphole, offset.Overflo
41、w Rear overflow hole. Waste Chainstay holeSimulation attributes might be required for specific applications.NOTE 4 See Annex D for an example of a recommended property set.5.2 Occurrence within projectsNot all attributes require completion when instantiated within a project; this extent of completio
42、n should be defined by the projects requirements and the stage of the project.Not all property values require an absolute numerical value, but they should have “maximum”, “minimum” and “in the range of”.NOTE 1 Example use of a generic object:Pedestal wash basinManufacturer Contractors choice Model X
43、X_001, XX_002, XX_003, YY_A, YY_B, ZZ_1 Standard BS 1188 Form Full pedestal Size 540 410 mmNOTE 2 Example use of a product object:Pedestal wash basinManufacturer XX Model XX_002 Compressive strength: 3.6 MPa minimum.At contract specification stage, attributes might deliberately not be shared and onl
44、y a manufacturer name and a product reference provided; however, the client may require the specifying information to support later replacement. The British Standards Institution 2012 5BS 8541-4:20125.3 ComplianceThe library object should be tested in accordance with: BS 8541-1; and the additional r
45、ules implied by the recommendations in 4.1 to 5.2.NOTE Compliance to this British Standard does not warrant the data transmitted.BS 8541-4:20126 The British Standards Institution 2012Annex ACOBie 2.4 presentationA.1General Table A.1 to Table A.3 give examples of the data required using the COBie rep
46、resentation, e.g. in a standard spreadsheet.Definitive information is contained in the current COBie documentation 1.A.2Specifying level of attributesTable A.1COBie attribute sheetNameCreatedBy(lookup)CreatedOnCategory(lookup)SheetName(lookup)RowName(lookup)ValueUnitDrainSizesales MyCompany.co.uk201
47、2-02- 11T18:31:28ApprovedTypeMyCompanyMC999 Basin470w 300d13millimetreA.3Assessment level of attributesTable A.2COBie impact sheetNameCreatedBy(lookup)CreatedOnImpactType(lookup)ImpactStage(lookup)SheetName(lookup)RowName(lookup)ValueImpactUnit(lookup)MyCompanyMC999 Basin470w300dOzone destructionsal
48、es MyCompany.co.uk2012-02- 11T18:31:28StratosphericOzoneLayerDestructionproductionTypeMyCompanyMC999 Basin470w 300d0.5kgA.4Simulation level of attributesTable A.3COBie attribute sheetNameCreatedByCreatedOnCategorySheetNameRowNameValueUnitWater supplypressuresale MyCompany.co.uk2012-02- 11T18:31:28Ap
49、provedTypeMyCompanyMC999 Basin470w x 300d1,10bar(informative) The British Standards Institution 2012 7BS 8541-4:2012Annex BISO10303-28“XML” formatB.1General Definitive information is contained in the current IFC documentation 2.B.2Attribute examplesStandards Standards notdefinedPEnum_LightFixture_Standards_UK to bs en 60598-1 to bs 4533-102-1. to bs en 60598-2-2. to bs en 60598-2-3. to bs en 60598-2-5. to bs en 60598-2-13. to bs 4533-102.19
