ASTM F2248-19
(Practice)Standard Practice for Specifying an Equivalent 3-Second Duration Design Loading for Blast Resistant Glazing Fabricated with Laminated Glass
Standard Practice for Specifying an Equivalent 3-Second Duration Design Loading for Blast Resistant Glazing Fabricated with Laminated Glass
SIGNIFICANCE AND USE
5.1 This practice provides a design load suitable for sizing blast resistant glazing comprised of laminated glass or insulating glass fabricated with laminated glass.
5.2 Blast resistant glazing comprised of laminated glass or insulating glass fabricated with laminated glass shall be sized to resist the 3-second duration equivalent design loading from this standard practice using the procedures described in Practice E1300.
5.3 In the event a blast loading does not occur to blast resistant glazing comprised of laminated glass or insulating glass fabricated with laminated glass sized using the 3-second duration loading determined herein, the blast resistant glazing will have a probability of breakage less than or equal to 8 lites per 1000 at the first occurrence of a loading equal to the 3-second duration design loading determined herein.
5.4 Blast resistant glazing designed to resist the 3-second equivalent load as determined herein, when properly supported as part of a blast resistant glazing system, is designed to perform to minimal hazard as defined in Test Method F2912.
SCOPE
1.1 This practice sets forth a method to specify an equivalent 3-second design loading suitable to use with Practice E1300 to select the thickness and type of blast resistant glazing fabricated with laminated glass to glaze a fenestration. Glass plies used to construct laminated glass are recommended to be either annealed or heat strengthened glass. This analytical method for glazing should be used with caution for glazing panels larger than 1.8 m by 2.4 m (6 ft by 8 ft) as this size panel exceeds database of testing upon which this standard is based.
1.2 This practice applies to blast resistant glazing fabricated using laminated glass only, including single laminated glass and insulating glass fabricated with laminated glass. As a minimum, insulating glass shall use laminated glass for the inboard (protected side) lite.
1.3 This practice assumes that blast resistant glazing shall be attached to its supporting frame using a captured bite so that it does not detach in the event of fracture due to a blast event.
1.4 Blast resistant glazing designed using this practice recommends the use of annealed or heat strengthened glass plies for the laminated glass. Blast testing has shown that use of fully tempered glass plies, when fractured during a blast event, have poorer post blast performance than annealed or heat strengthened glass plies. Laminated glass fabricated with fully tempered glass plies has a tendency to leave the supporting glazing system frame after fracture whereas laminated glass fabricated with annealed or heat strengthened glass plies will remain in the frame and absorb remaining load through tensile membrane behavior. Use of the annealed or heat strengthened glass plies will also reduce the amount of load transferred into the structure.
1.5 The equivalent 3-second design load as determined herein shall not apply to the design of monolithic glazing, plastic glazing, or security film applied to existing glazing configurations in an attempt to achieve blast resistance.
1.6 The values stated in SI units are to be regarded as the standard. Values given in parentheses are for information only. For conversion of quantities in various systems of measurements to SI units refer to ANSI IEEE/SI 10.
1.7 This standard does not purport to address all of the safety concerns, if any, associated with its use. It is the responsibility of the user of this standard to establish appropriate safety, health, and environmental practices and determine the applicability of regulatory limitations prior to use.
1.8 This international standard was developed in accordance with internationally recognized principles on standardization established in the Decision on Principles for the Development of International Standards, Guides and Recommendations issued by the World Trade Organization Technical Barriers ...
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This international standard was developed in accordance with internationally recognized principles on standardization established in the Decision on Principles for the
Development of International Standards, Guides and Recommendations issued by the World Trade Organization Technical Barriers to Trade (TBT) Committee.
Designation: F2248 − 19
Standard Practice for
Specifying an Equivalent 3-Second Duration Design Loading
for Blast Resistant Glazing Fabricated with Laminated
1
Glass
This standard is issued under the fixed designation F2248; the number immediately following the designation indicates the year of
original adoption or, in the case of revision, the year of last revision.Anumber in parentheses indicates the year of last reapproval.A
superscript epsilon (´) indicates an editorial change since the last revision or reapproval.
INTRODUCTION
Historical records show that fragments from glazing that has failed as the result of intentional or
accidental explosions present a serious threat of personal injury. Glazing failure also allows blast
pressure to enter the interior of buildings thus resulting in additional threat of personal injury and
facility damage. This standard practice provides a means for designers to determine equivalent
3-second duration design loadings with which they can size blast resistant glazing comprised of
laminated glass or insulating glass fabricated with laminated glass, or both. Blast resistant glazing
systems of this genre can reduce the number and size of glass fragments in an explosion as well as
reducing greatly or eliminating blast pressure that enters buildings when an explosion occurs.
1. Scope event, have poorer post blast performance than annealed or
heat strengthened glass plies. Laminated glass fabricated with
1.1 This practice sets forth a method to specify an equiva-
fully tempered glass plies has a tendency to leave the support-
lent 3-second design loading suitable to use with Practice
ing glazing system frame after fracture whereas laminated
E1300toselectthethicknessandtypeofblastresistantglazing
glass fabricated with annealed or heat strengthened glass plies
fabricated with laminated glass to glaze a fenestration. Glass
will remain in the frame and absorb remaining load through
plies used to construct laminated glass are recommended to be
tensile membrane behavior. Use of the annealed or heat
either annealed or heat strengthened glass. This analytical
strengthened glass plies will also reduce the amount of load
method for glazing should be used with caution for glazing
panelslargerthan1.8mby2.4m(6ftby8ft)asthissizepanel transferred into the structure.
exceeds database of testing upon which this standard is based.
1.5 The equivalent 3-second design load as determined
1.2 Thispracticeappliestoblastresistantglazingfabricated
herein shall not apply to the design of monolithic glazing,
using laminated glass only, including single laminated glass
plastic glazing, or security film applied to existing glazing
and insulating glass fabricated with laminated glass. As a
configurations in an attempt to achieve blast resistance.
minimum, insulating glass shall use laminated glass for the
1.6 The values stated in SI units are to be regarded as the
inboard (protected side) lite.
standard.Values given in parentheses are for information only.
1.3 This practice assumes that blast resistant glazing shall
For conversion of quantities in various systems of measure-
beattachedtoitssupportingframeusingacapturedbitesothat
ments to SI units refer to ANSI IEEE/SI 10.
it does not detach in the event of fracture due to a blast event.
1.7 This standard does not purport to address all of the
1.4 Blast resistant glazing designed using this practice
safety concerns, if any, associated with its use. It is the
recommends the use of annealed or heat strengthened glass
responsibility of the user of this standard to establish appro-
plies for the laminated glass. Blast testing has shown that use
priate safety, health, and environmental practices and deter-
of fully tempered glass plies, when fractured during a blast
mine the applicability of regulatory limitations prior to use.
1.8 This international standard was developed in accor-
1 dance with internationally recognized principles on standard-
This practice is under the jurisdiction of ASTM Committee F12 on Security
Systems and Equipment and is the direct responsibility of Subcommittee F12.10 on
ization established in the Decision on Principles for the
Systems Products and Services.
Development of International Standards, Guides and Recom-
Current edition approved May 1, 2019. Published June 2019. Originally
mendations issued by the World Trade Organization Technical
approved in 2003. Last previous edition approved in 2012 as F2248–12. DOI:
10.1520/F2248-19. Barriers to Trade (TBT) Committee.
Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959. United States
1
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This document is not an ASTM standard and is intended only to provide the user of an ASTM standard an indication of what changes have been made to the previous version. Because
it may not be technically possible to adequately depict all changes accurately, ASTM recommends that users consult prior editions as appropriate. In all cases only the current version
of the standard as published by ASTM is to be considered the official document.
Designation: F2248 − 12 F2248 − 19
Standard Practice for
Specifying an Equivalent 3-Second Duration Design Loading
for Blast Resistant Glazing Fabricated with Laminated
1
Glass
This standard is issued under the fixed designation F2248; the number immediately following the designation indicates the year of
original adoption or, in the case of revision, the year of last revision. A number in parentheses indicates the year of last reapproval. A
superscript epsilon (´) indicates an editorial change since the last revision or reapproval.
INTRODUCTION
Historical records show that fragments from glazing that has failed as the result of intentional or
accidental explosions present a serious threat of personal injury. Glazing failure also allows blast
pressure to enter the interior of buildings thus resulting in additional threat of personal injury and
facility damage. This standard practice provides a means for designers to determine equivalent
3-second duration design loadings with which they can size blast resistant glazing comprised of
laminated glass or insulating glass fabricated with laminated glass, or both. Blast resistant glazing
systems of this genre can reduce the number and size of glass fragments in an explosion as well as
reducing greatly or eliminating blast pressure that enters buildings when an explosion occurs.
1. Scope
1.1 This practice sets forth a method to specify an equivalent 3-second design loading suitable to use with Practice E1300 to
select the thickness and type of blast resistant glazing fabricated with laminated glass to glaze a fenestration. Glass plies used to
construct laminated glass are recommended to be either annealed or heat strengthened glass. This analytical method for glazing
should be used with caution for glazing panels larger than 1.8 m by 2.4 m (6 ft by 8 ft) as this size panel exceeds database of testing
upon which this standard is based.
1.2 This practice applies to blast resistant glazing fabricated using laminated glass only, including single laminated glass and
insulating glass fabricated with laminated glass. As a minimum, insulating glass shall use laminated glass for the inboard (protected
side) lite.
1.3 This practice assumes that blast resistant glazing shall be adheredattached to its supporting frame using structural silicone
sealant or adhesive glazing tape. The width of the structural silicone sealant bead shall be at least equal to the larger of 10-mm
3
(a captured bite so that ⁄8-in.) or the thickness designation of the glass to which it adheres but not larger than two times the
thickness designation of the glass to which it adheres. The minimum thickness of the structural silicone bead shall be 5-mm (it
3
does not detach in the event of fracture due to a blast event. ⁄16-in.). The width of glazing tape shall be at least equal to two times
but not more than four times the thickness designation of the glass to which it adheres. The width of silicone or glazing tape is
referred to as bite and is shown and discussed in Guide C1564.
1.4 This practice assumes that the structural silicone bead or glazing tape is applied to both sides of single lite laminated glass
but need only be applied to the inboard side (protected side) of insulating glass.
1.5 This practice assumes the framing members shall restrict deflections of edges of blast resistant glazing they support to L/60
under 2.0× the load resistance of the blast resistant glazing for inward loading, where L denotes the length of the supported edge.
1.6 This practice assumes the framing system supporting the blast resistant glazing shall attach mechanically to the structural
framing system. The system shall be designed to ensure that the glazing fails prior to the framing system that supports the glazing
and its attachment to the structural framing system. The fasteners that attach the framing system that supports the glazing to the
structural framing system shall be designed to resist a uniform load acting on the blast resistant glazing that has a magnitude of
at least:
1
This practice is under the jurisdiction of ASTM Committee F12 on Security Systems and Equipment and is the direct responsibility of Subcommittee F12.10 on Systems
Products and Services.
Current edition approved Oct. 1, 2012May 1, 2019. Published November 2012June 2019. Originally approved in 2003. Last previous edition approved in 20092012 as
F2248 – 09.F2248 – 12. DOI: 10.1520/F2248-12.10.1520/F2248-19.
Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959. Uni
...
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