ASTM_F_2248_-_19.pdf

Designation:F224819Standard Practice forSpecifying an Equivalent 3-Second Duration Design Loadingfor Blast Resistant Glazing Fabricated with LaminatedGlass1This standard is issued under the fixed designation F2248;the number immediately following the designation indicates the year oforiginal adoption or,in the case of revision,the year of last revision.A number in parentheses indicates the year of last reapproval.Asuperscript epsilon()indicates an editorial change since the last revision or reapproval.INTRODUCTIONHistorical records show that fragments from glazing that has failed as the result of intentional oraccidental explosions present a serious threat of personal injury.Glazing failure also allows blastpressure to enter the interior of buildings thus resulting in additional threat of personal injury andfacility damage.This standard practice provides a means for designers to determine equivalent3-second duration design loadings with which they can size blast resistant glazing comprised oflaminated glass or insulating glass fabricated with laminated glass,or both.Blast resistant glazingsystems of this genre can reduce the number and size of glass fragments in an explosion as well asreducing greatly or eliminating blast pressure that enters buildings when an explosion occurs.1.Scope1.1 This practice sets forth a method to specify an equiva-lent 3-second design loading suitable to use with PracticeE1300 to select the thickness and type of blast resistant glazingfabricated with laminated glass to glaze a fenestration.Glassplies used to construct laminated glass are recommended to beeither annealed or heat strengthened glass.This analyticalmethod for glazing should be used with caution for glazingpanels larger than 1.8 m by 2.4 m(6 ft by 8 ft)as this size panelexceeds database of testing upon which this standard is based.1.2 This practice applies to blast resistant glazing fabricatedusing laminated glass only,including single laminated glassand insulating glass fabricated with laminated glass.As aminimum,insulating glass shall use laminated glass for theinboard(protected side)lite.1.3 This practice assumes that blast resistant glazing shallbe attached to its supporting frame using a captured bite so thatit does not detach in the event of fracture due to a blast event.1.4 Blast resistant glazing designed using this practicerecommends the use of annealed or heat strengthened glassplies for the laminated glass.Blast testing has shown that useof fully tempered glass plies,when fractured during a blastevent,have poorer post blast performance than annealed orheat strengthened glass plies.Laminated glass fabricated withfully tempered glass plies has a tendency to leave the support-ing glazing system frame after fracture whereas laminatedglass fabricated with annealed or heat strengthened glass plieswill remain in the frame and absorb remaining load throughtensile membrane behavior.Use of the annealed or heatstrengthened glass plies will also reduce the amount of loadtransferred into the structure.1.5 The equivalent 3-second design load as determinedherein shall not apply to the design of monolithic glazing,plastic glazing,or security film applied to existing glazingconfigurations in an attempt to achieve blast resistance.1.6 The values stated in SI units are to be regarded as thestandard.Values given in parentheses are for information only.For conversion of quantities in various systems of measure-ments to SI units refer to ANSI IEEE/SI 10.1.7 This standard does not purport to address all of thesafety concerns,if any,associated with its use.It is theresponsibility of the user of this standard to establish appro-priate safety,health,and environmental practices and deter-mine the applicability of regulatory limitations prior to use.1.8 This international standard was developed in accor-dance with internationally recognized principles on standard-ization established in the Decision on Principles for theDevelopment of International Standards,Guides and Recom-mendations issued by the World Trade Organization TechnicalBarriers to Trade(TBT)Committee.1This practice is under the jurisdiction of ASTM Committee F12 on SecuritySystems and Equipment and is the direct responsibility of Subcommittee F12.10 onSystems Products and Services.Current edition approved May 1,2019.Published June 2019.Originallyapproved in 2003.Last previous edition approved in 2012 as F2248 12.DOI:10.1520/F2248-19.Copyright ASTM International,100 Barr Harbor Drive,PO Box C700,West Conshohocken,PA 19428-2959.United StatesThis international standard was developed in accordance with internationally recognized principles on standardization established in the Decision on Principles for theDevelopment of International Standards,Guides and Recommendations issued by the World Trade Organization Technical Barriers to Trade(TBT)Committee.1 2.Referenced Documents2.1 ASTM Standards:2C1036 Specification for Flat GlassC1048 Specification for Heat-Strengthened and Ful