PAGE 1 OF One of the design requirements of glass used in buildings is to resist the loads created by wind and snow. ASTM E to the French and ASTM standard, that in some cases admit a lower design thickness for glass, then for the same . NF P  ASTM E – Glass strength evaluation prior to ASTM E Twelve U.S. glass thickness designations were covered from millimetre to millimetre.
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An approximate allowable edge stress value for a 3-s duration can be found in Table X7. These minimum glass thicknesses are presented in Table 4.
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By joining you are opting in to receive e-mail. For glass simply supported on three sides, the ratio of the length of one of the supported edges perpendicular to the free edge, to the length of the free edge, is equal to or greater than 0.
Substituting into Eq X9. The LS factor for one ply of the laminated lite of an IG composed of: These factors include but are not limited to: The method applies to 2-ply laminates fabricated from both equal and unequal thickness glass plies.
Windows I usually work with are 24 to 36 inch base dimension. The PE I usually work with in regards to glass, had a medical event he has since recovered from. A larger combined dimension may result in excessive sealant stress and glass stresses due to temperature and altitude conditions.
E 1300 – 12ae1
Glass99, Thank you, Glass is not one of my normal materials. For these loading duration and temperature considerations the interlayer shear modulus, G, is determined to be 0. A number in parentheses indicates the year of last reapproval. The outboard lite Lite No.
The NFL is thus found to be 2. The intent of Appendix X9 is to provide a method that allows the user to perform engineering analysis of lami- X9. These effective thickness values can be used with standard engineering formulae or finite element methods for calculating both deflection and glass stress of laminates subjected to load.
Use Vallabhan and Chou 1 for alternate method.
The shear modulus value shall be determined following Practice D It is the responsibility of the user of this standard to establish appropriate safety and health practices and determine the applicability of regulatory limitations prior to use.
It is possible that the information presented in the NFL charts may change as further data becomes available. The information in this practice applies only to polyvinyl ashm PVB interlayer or those interlayers that demonstrate equivalency according to Appendix X8.
Note that Section 6 references a Pb less than or equal to 0. Are you an Engineering professional? Thank you for helping keep Eng-Tips Forums free from inappropriate posts. Link to Active This link will always route to the current Active version of the standard. Therefore the AN lite probability factor becomes: The actual thickness of the glass is 5. Your comments are invited either for revision of this standard or for additional standards and should be addressed to ASTM International Headquarters.
Home E – 12ae1 E – 12ae1 September 14, Author: This includes trapezoids, circular, triangular, and other odd shapes. For a single monolithic lite with two surfaces equally at risk, p e3100-12 1.
ASTM E – 12 Standard Practice for Determining Load Resistance of Glass in Buildings
The glass thickness used for calculating load sharing factors for short duration loads is the sum of the thickness of glass of the 2 plies in accordance with Table 1. Qstm beam is fixed along one long edge cantilever and is subjected to a line load, P, of 0.
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Will this window glass support a 1. Interlayers comprised of differing polymers in multiple layers are not covered in this procedure. Astk development of the NFL charts presented in upper charts of Fig. Report “E – 12ae1”. Originally approved in Determine if the skylight will support a 6. Duration Factor 3s 10 s 60 s 10 min 60 min 12 h 24 h 1 week 1 month 30 days 1 year beyond 1 year 1. The proposed laminate construction is 10 mm glass 1.
Under short duration loads LG is assumed to behave in a monolithic-like manner. The question in specifics is in regards to the caution stated in X1.