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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The NFL is thus found to be 2. Substituting into Eq X9.
Use Vallabhan and Chou 1 for alternate method. The specified design load shall be used for this calculation. The shear modulus value shall be determined following Practice D Therefore the AN lite probability factor becomes: We need your help!
Last previous edition approved in as E — It’s easy to join and it’s free. Referenced Documents zstm separately The documents listed below are referenced within the subject standard but are not provided as part of the standard. As the area of glass under a given stress increases there is an increased risk of breakage occurring.
ASTM Ea – Glass engineering – Eng-Tips
Appendix X1 provides additional procedures to determine maximum lateral deflection for glass simply supported on four sides. Approximate Center of Glass Deflection Determination in SI Units—Determine the approximate center of glass awtm associated with a vertical by by 6-mm rectangular glass plate subjected to a uniform lateral load of 1.
Complete discussions of the formulation of the model are presented elsewhere 2, 3.
The outboard lite Lite No. The glass gets stiffer as it deflects. 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.
E 1300 – 12ae1
The LS factor for one ply of the laminated lite of an IG composed of: Where membrane stresses predominate, the exponent is less than 3 but this regime is outside the range of typical architectural glass design.
Appendix X1 presents additional procedures to determine the approximate maximum lateral deflection for a specified load on glass simply supported on four sides. The values given in parentheses are for mathematical conversions to inch-pound units that are provided for information only and are not considered standard.
Effective thickness for stress: The actual thickness of the glass is 5.
ASTM E – 12 Standard Practice for Determining Load Resistance of Glass in Buildings
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. For insulating glass units, this practice only applies to insulating glass units with aetm edge support.
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If the LR is greater than or equal to the specified design load, then the glass types and thicknesses are acceptable for a breakage probability of less than, or equal to, 8 in The final thickness and type of glass selected also depends upon a variety of other factors see 5.
All interlayers are viscoelastic so consideration must be given to load duration and temperature for the intended use. Rigorous engineering analysis that accounts for the geometrically nonlinear performance of glass lites, glass surface condition, residual surface compression, surface area under stress, geometry, support conditions, load type and duration, and other relevant parameters can result in other type factors. Polished Edges, MPa psi These flaw parameters represent the surface strength of weathered window glass that has undergone in-service conditions for approximately 20 years.
Summary of Practice 4. We are a non-profit group that run this website to share documents. For a single monolithic lite with two surfaces equally at risk, p 5 1. The question in specifics is in regards to the caution stated in X1.
The model allows the probability of breakage of any lite or ply to be specified in terms of two surface flaw parameters, m and k. Users of this standard are expressly advised that determination of the validity of any such patent rights, and the risk of infringement of such rights, are entirely their own responsibility.
This practice shall not apply to other applications including, but not limited to, balustrades, glass floor panels, aquariums, structural glass members, and glass shelves. This maximum calculated stress must be less than the maximum allowable asttm. Typical load duration-temperature combinations for design purposes are: All loads are considered normal to the glass surface.