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首页标准规范国家标准BS 476-20(1987) 建筑构件耐火的测定方法(一般原理)
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BS 476-20(1987) 建筑构件耐火的测定方法(一般原理)

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BS 476-20(1987) 建筑构件耐火的测定方法(一般原理)
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BS476:Pat20:1987otheducedBritish StandardFire tests on building materialsand structuresPart 20.Method for determination of the fire resistance ofelements of construction (general principles)Essais au feu des materiaux et structures du batimentPartie 20.Methode de determination de la resistance au feu des elements de construction(principes generaux)Brandschutztechnische Prufungen an Baustoffen und BautenTeil 20.Verfahren zur Bestimmung des Feuerwiderstandes von Bauteilen (Allgemeines)British Standards InstitutionBS476:Part20:1987ForewordThis Part of BS 476 has been prepared under the directionis a greater acceptability of smaller furnaces for testingof the Fire Standards Committee and describes the generalspecimens of elements that are,at full size,capable of beingprocedures and equipment required to determine the firetested in smaller furnaces.Because of the diversity ofresistance of elements of construction.This Part should befurnace designs it has not been possible to define theread together with BS 476 Parts 21,22 and 23 asequipment more tightly,although A.5 does give guidanceappropriate which describe the detailed procedure for theon the points to be considered in any future furnacetesting of individual elements of construction The fourdesigns This Part has,however,eliminated the use of oilParts taken together constitute a complete revision ofbased fuels as a method of heating a fire resistance testngBS 476.Part 8,which is withdrawn However,the latterfurnacewill still be made available on request,since it is referredThe differential pressure between the furnace chamber andto in building regulations and other legislative documentsthe laboratory has been changed slightly with respect toParts 20 to 23 have been prepared in such a way thatthe magnitude,the time of application and the measuringPart 20 will need to be used with the subsequent Partstechnique.This has been done in an attempt to rationalizethe pressure difference requirements for all elements underFor the purposes of these Parts,elements of constructiontest.have been categorized into three main groups:(a)loadbearing elements that have a fire resistance;for Standardization,Technical Committee ISO/TC 92,(b)non-loadbearing elements that have a fire resistance;Fire tests on building materials,components and structures,(c)elements that make a contribution to the fireto dispense with the use of the criterion of stability(ultimate integrity)in the fire resistance testing proceduresresistance of a structure.for fire doors and glazed elements (ISO 3008 and ISO 3009The specific requirements for the testing of these groupsrespectively)it has been decided to adopt a similar principleare described in Parts 21 to 23 respectively.Guidance andin this revision.It is no longer required,therefore,tobackground informatron that will assist the designer andevaluate non-loadbearing elements (see BS 476 Part 22)the testing authority to select and evaluate specimens thatwith respect to compliance with a stability requirement.are more representative of situations in practice are givenIn order to clarify the use of stability in respect toin appendices to the four Partsloadbearing elements a new term,loadbearing capacity,The revision of BS 476 Part 8 has been prepared in orderhas been introduced in this revision (see clause 2 andto improve repeatability and reproducibility of the resultsappendix A).The criterion for integrity has also beenobtained by more closely defining the operating proceduresslightly modified and a new term,impermeability,has beenand the equipment used The main changes relate tointroduced in order to clarify one aspect of integritymprovements in the techniques for measuring temperature,failure.pressure and load distribution.Following the publicationInformation on the evaluation of residual loadbearingof PD 6496 which analysed the differences between thecapacity is given in appendix B.ISO 3009,and Annex 1 of the preliminary draft on anAttention is drawn to the Health and Safety at Work etc.EEC Commission Directive DG 111 (document 1202.Act 1974,and the need to ensure that the method of testSeptember 1977)(now replaced by EUR 8750),thisdescribed in this standard is carried out under suitablerevision has,where possible,adopted similar requirementsenvironmental conditions to provide adequate protectionto those given in the international standards,though into personnel against the risk of fire,and/or inhalation ofsome cases,improvements have been made.Theseimprovements have tended to tighten up the proceduresCaution.The mechanical sawing of asbestos cementalready specifted in the other standards and will thereforecomponents attracts the provision of the Asbestosremain in compliance with them.Regulations 1969.Adequate methods exist to controlOne significant change in the method is the introductionlevels of dust during such operations and these are detailedof a fixed temperature/time heating regime which assumesin the Control and Safety Guides issued by the Asbestosa notional ambient temperature rather than the use of atemperature/rise curve that is related to the actual ambtenttemperature at the time of the test.The reasons for thischange are described in appendix A.A further change has been the adoption of the minimumCompliance with a British Standard does not of itselfspecimen sizes specified in ISO 834.Combined with thisconfer immunity from legal obligations.
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