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本文(NFPA 251-2006 Standard Methods of Tests of Fire Resistance of Building Construction and Materials (Effective Date 8 18 2005)《建筑构造和材料防火测试的标准方法 生效日期 2005-08-18》.pdf)为本站会员(priceawful190)主动上传,麦多课文库仅提供信息存储空间,仅对用户上传内容的表现方式做保护处理,对上载内容本身不做任何修改或编辑。 若此文所含内容侵犯了您的版权或隐私,请立即通知麦多课文库(发送邮件至master@mydoc123.com或直接QQ联系客服),我们立即给予删除!

NFPA 251-2006 Standard Methods of Tests of Fire Resistance of Building Construction and Materials (Effective Date 8 18 2005)《建筑构造和材料防火测试的标准方法 生效日期 2005-08-18》.pdf

1、NFPA 251 Standard Methods of Tests of Fire Resistance of Building Construction and Materials 2006 Edition NFPA, 1 Batterymarch Park, Quincy, MA 02169-7471 An International Codes and Standards Organization IMPORTANT NOTICES AND DISCLAIMERS CONCERNING NFPA DOCUMENTSNOTICE AND DISCLAIMER OF LIABILITY C

2、ONCERNING THE USE OF NFPA DOCUMENTSNFPA codes, standards, recommended practices, and guides, of which the document contained herein is one, are de-veloped through a consensus standards development process approved by the American National Standards Institute.This process brings together volunteers r

3、epresenting varied viewpoints and interests to achieve consensus on fire andother safety issues. While the NFPA administers the process and establishes rules to promote fairness in the develop-ment of consensus, it does not independently test, evaluate, or verify the accuracy of any information or t

4、he soundnessof any judgments contained in its codes and standards.The NFPA disclaims liability for any personal injury, property or other damages of any nature whatsoever, whetherspecial, indirect, consequential or compensatory, directly or indirectly resulting from the publication, use of, or relia

5、nceon this document. The NFPA also makes no guaranty or warranty as to the accuracy or completeness of any informationpublished herein.In issuing and making this document available, the NFPA is not undertaking to render professional or other servicesfor or on behalf of any person or entity. Nor is t

6、he NFPA undertaking to perform any duty owed by any person or entityto someone else. Anyone using this document should rely on his or her own independent judgment or, as appropriate,seek the advice of a competent professional in determining the exercise of reasonable care in any given circumstances.

7、The NFPA has no power, nor does it undertake, to police or enforce compliance with the contents of this document.Nor does the NFPA list, certify, test or inspect products, designs, or installations for compliance with this document.Any certification or other statement of compliance with the requirem

8、ents of this document shall not be attributable tothe NFPA and is solely the responsibility of the certifier or maker of the statement.ADDITIONAL NOTICES AND DISCLAIMERSUpdating of NFPA DocumentsUsers of NFPA codes, standards, recommended practices, and guides should be aware thatthese documents may

9、 be superseded at any time by the issuance of new editions or may beamended from time to time through the issuance of Tentative Interim Amendments. An offi-cial NFPA document at any point in time consists of the current edition of the documenttogether with any Tentative Interim Amendments and any Er

10、rata then in effect. In order todetermine whether a given document is the current edition and whether it has been amendedthrough the issuance of Tentative Interim Amendments or corrected through the issuance ofErrata, consult appropriate NFPA publications such as the National Fire CodesSubscriptionS

11、ervice, visit the NFPA website at www.nfpa.org, or contact the NFPA at the address listedbelow.Interpretations of NFPA DocumentsA statement, written or oral, that is not processed in accordance with Section 6 of the Reg-ulations Governing Committee Projects shall not be considered the official posit

12、ion of NFPAor any of its Committees and shall not be considered to be, nor be relied upon as, a FormalInterpretation.PatentsThe NFPA does not take any position with respect to the validity of any patent rightsasserted in connection with any items which are mentioned in or are the subject of NFPAcode

13、s, standards, recommended practices, and guides, and the NFPA disclaims liability forthe infringement of any patent resulting from the use of or reliance on these documents.Users of these documents are expressly advised that determination of the validity of any suchpatent rights, and the risk of inf

14、ringement of such rights, is entirely their own responsibility.NFPA adheres to applicable policies of the American National Standards Institute withrespect to patents. For further information contact the NFPA at the address listed below.Law and RegulationsUsers of these documents should consult appl

15、icable federal, state, and local laws and reg-ulations. NFPA does not, by the publication of its codes, standards, recommended practices,and guides, intend to urge action that is not in compliance with applicable laws, and thesedocuments may not be construed as doing so.CopyrightsThis document is co

16、pyrighted by the NFPA. It is made available for a wide variety of bothpublic and private uses. These include both use, by reference, in laws and regulations, anduse in private self-regulation, standardization, and the promotion of safe practices andmethods. By making this document available for use

17、and adoption by public authorities andprivate users, the NFPA does not waive any rights in copyright to this document.Use of NFPA documents for regulatory purposes should be accomplished through adop-tion by reference. The term “adoption by reference” means the citing of title, edition, andpublishin

18、g information only. Any deletions, additions, and changes desired by the adoptingauthority should be noted separately in the adopting instrument. In order to assist NFPA infollowing the uses made of its documents, adopting authorities are requested to notify theNFPA (Attention: Secretary, Standards

19、Council) in writing of such use. For technical assis-tance and questions concerning adoption of NFPA documents, contact NFPA at the addressbelow.For Further InformationAll questions or other communications relating to NFPA codes, standards, recommendedpractices, and guides and all requests for infor

20、mation on NFPA procedures governing itscodes and standards development process, including information on the procedures forrequesting Formal Interpretations, for proposing Tentative Interim Amendments, and forproposing revisions to NFPA documents during regular revision cycles, should be sent toNFPA

21、 headquarters, addressed to the attention of the Secretary, Standards Council, NFPA,1 Batterymarch Park, P.O. Box 9101, Quincy, MA 02269-9101.For more information about NFPA, visit the NFPA website at www.nfpa.org.Copyright 2005, National Fire Protection Association, All Rights ReservedNFPA 251Stand

22、ard Methods of Tests ofFire Resistance of Building Construction and Materials2006 EditionThis edition of NFPA 251, Standard Methods of Tests of Fire Resistance of Building Constructionand Materials, was prepared by the Technical Committee on Fire Tests and acted on by NFPAat its June Association Tec

23、hnical Meeting held June 610, 2005, in Las Vegas, NV. It was issuedby the Standards Council on July 29, 2005, with an effective date of August 18, 2005, andsupersedes all previous editions.This edition of NFPA 251 was approved as an American National Standard on August 18,2005.Origin and Development

24、 of NFPA 251NFPA 251 originated in the recommendations of the International Fire Prevention Con-gress in London in 1903. It was presented to the NFPA by the Committee on Fire-ResistiveConstruction in 1914. It was adopted officially in a revised form in 1918. Successive editionswere published in 1926

25、, 1934, 1941, 1955, 1958, 1959, 1960, 1961, 1963, 1969, 1979, 1985, and1990. It was overseen, in succession, by the Technical Committee on Fire-Resistive Construc-tion, the Technical Committee on Building Construction, and, for the last three editions, bythe Technical Committee on Fire Tests.The 199

26、5 edition of this document was a reconfirmation of the earlier edition with only afew items being addressed. Substantial investigation and record research was done on thetopic of the hose stream application on test specimens. The findings of the committee did notsupport modification of the provision

27、 that permits a test assembly to be tested for one-half thetime required for an hourly rating and then to be tested by a hose stream.The committee also modified the title of this document in response to the research doneto convey a truer sense of the standards proper application.The 1999 edition was

28、 a reconfirmation of the 1995 edition with minor editorial modifications.The 2006 edition includes a complete editorial rewrite for compliance with the Manual ofStyle for NFPA Technical Committee Documents. The title of the document was revised to moreaccurately reflect the subject matter, and furth

29、er organizational and editorial changes weremade to improve the application of the test method. Technical changes include the additionof definitions of fire resistance and fire resistance rating and modifications to the hose stream testrequirements.2511Technical Committee on Fire TestsWilliam E. Fit

30、ch, ChairOmega Point Laboratories Inc., TX RTJesse J. Beitel, Hughes Associates, Inc., MD SEApril L. Berkol, Starwood Hotels and Resorts Worldwide,Inc., NY URep. American Hotel and Lodging AssociationRobert G. Bill, Jr., FM Global, MA IJohn A. Blair, The DuPont Company, DE MRep. Society of the Plast

31、ics Industry, Inc.Gordon H. Damant, Inter-City Testing and ConsultingCorp. of California, CA SEThomas W. Fritz, Armstrong World Industries, Inc., PA MPravinray D. Gandhi, Underwriters Laboratories Inc., ILRTJames R. Griffith, Southwest Research Institute, TX RTGordon E. Hartzell, Hartzell Consulting

32、, Inc., TX SEMarcelo M. Hirschler, GBH International, CA SEAlfred J. Hogan, Reedy Creek Improvement District, FL ERep. International Fire Marshals AssociationWilliam E. Koffel, Koffel Associates, Inc., MD SEJames R. Lawson, U.S. National Institute of Standardsand Technology, MD RTRodney A. McPhee, C

33、anadian Wood Council, Canada MFrederick W. Mowrer, University of Maryland, MD SEDavid T. Sheppard, U.S. Department of Justice, MD RTKuma Sumathipala, American Forest others use a systemof hydraulic rams for floor and roof assemblies. Where a uni-formly distributed load is simulated by point-loading

34、(severalsmall-area loads), it is recommended that the load at any sucharea not exceed 25 percent of the total load and that the indi-vidual load have a width at least equal to the depth of the floor.Wall furnaces generally are equipped with hydraulic rams.G.8.3 This standard requires that load-beari

35、ng walls and parti-tions sustain the applied test load during the fire endurance andhose stream tests. A former provision that required load-bearingwalls and partitions to sustain twice the specified superimposedtest load after cooling but within 72 hours of the test period hasbeen deleted from the

36、method as being unrealistic. Nonbearingwalls and partitions are not loaded during the test but are re-strained on all sides. This restraint could impose more stress thana load on top. The ASTM Committee E-5 has reviewed the load-ing procedures for framed walls and partitions several times. Itwas the

37、 committees unanimous decision that such a wall betested either with calculated maximum design load or with a loadexpected to occur in practice. The method used to compute thedesign loads should be reported.G.8.4 Some important stresses, such as those caused by creepand shrinkage in the wall itself

38、and its supporting frame, arepresent, and the designer should recognize these stresses in theanalysis. The ASTM Committee E-5 has investigated the possibil-ity of openings occurring in joints at the corners of non-load-bearing enclosures due to differential movement. While the pos-sibility exists th

39、at this will occur, the committee has not found itfeasible to amend the test based on available data.G.8.5 Double walls pose a unique problem for load application.Which wall should be loaded? Should both walls be loaded simul-taneously? The ASTM Committee E-5 has devoted considerabletime to debating

40、 this problem and recommends that the deci-sion be made by the user after an analysis of the loading condi-tions anticipated in service both before and after a fire. Suchloading conditions are to be reported.G.9 Integrity. All walls and partitions that qualify for a fireendurance classification of 1

41、 hour or more are required to besubjected to the cooling impact and erosion effects of a streamof water from a 212 in. (63.5 mm) hose discharging through astandard play pipe equipped with a 118 in. (28.6 mm) tip un-der specified pressures. In this hose stream test, the ability ofthe construction to

42、resist disintegration under adverse condi-tions is examined. The requirement for a hose stream test wasremoved from the test procedure for columns and floor orroof assemblies because of impracticality and the possibility ofexcessive damage to the furnace.G.10 Conditions of Tests.G.10.1 Columns gener

43、ally are tested with all four sides ex-posed to the test fire. However, it is possible to test a columnwith three sides exposed (with the fourth side against a wall).This standard requires that specimens be tested under condi-tions contemplated in the design. The former general practiceof testing co

44、lumns with pin connection at the top and bottomto simulate the most critical condition is no longer a criterion.G.10.2 Columns are required to sustain successfully the designload during the test period. This standard also permits columnsto be loaded up to 134 times the design load prior to the fire

45、test,if desired by the submitter. Such loading, however, should not beconstrued as having had a deleterious effect on the fire endur-ance test performance. Instead of loading, steel columns, whoseprotective covering does not carry a load, can be assigned a fireresistance classification on the basis

46、of the temperature of thesteel only. With such columns, the protective cover should berestrained against longitudinal expansion. Wood columns aretested for load-carrying ability only.G.10.3 Test results have established that variations of re-straint conditions can influence the time of fire resistan

47、ce fora structure or a structural element considerably. Restraintsgenerally are beneficial to fire resistance; however, there areconditions under which restraint can have a detrimental effecton the performance of a specimen during a fire resistancetest.34, 35 The users of test results are advised to

48、 study thereference documents as well as Annex E and Table E.1.5.G.10.4 An unrestrained fire resistance rating for a steel beam ora reinforced concrete beam used as part of an assembly tested inrestrained condition can be assessed from the temperaturerecords obtained for the steel or the reinforcing

49、 steel, respec-tively (see Chapter 13). It is also possible to evaluate the protectivecover of steel beams by measuring the temperature of the steelthat is protected (see Chapter 14). The fire resistance rating deter-mined under the provisions of Chapter 13 is applicable only tobeams used with a floor or roof construction that has a compa-rable or greater capacity for heat dissipation from the beam thanthe floor or roof with which the beam is tested.G.11 Other Observations.G.11.1 No limitation is imposed on the deformation of thespecimen during or

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