ASTM WK80563
New Practice for Determination of Laminated Glass Effective Thickness
1. Scope
1.1 This practice describes procedures to determine the effective thickness (ET) of laminated glass (LG). This standard includes calculation of effective monolithic lite section properties for LG lites subject to in- and out-of-plane loading. This practice applies to LG beam, column, and plate applications that are composed of two or more plies of glass bonded with a polymeric interlayer for symmetric or asymmetric plies. It applies to LG compositions with specified interlayer mechanical properties. 1.2 This practice does not address other combinations of loading and boundary conditions, non-linear structural or post-fracture behavior, load resistance or capacity, or design considerations. 1.3 Units - The values stated in SI units are to be regarded as the standard. No other units of measurement are included in this standard. 1.4 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 and health practices and determine the applicability of regulatory limitations prior to use.Keywords
Effective Thickness; Laminated Glass; Architectural Glass; Structural AnalysisRationale
We propose this standard for determination of effective thickness for evaluation of laminated glass structural performance for a broad range of section geometries (e.g., double, triple, and multi-ply laminated glass plies), loading and boundary conditions and three effective thickness methods. The prevailing method of calculating effective thickness is in Appendix X9 of Practice E1300, but this method is only intended for simply supported beams with certain loading conditions and laminates having a 2-ply makeup. Additional effective thickness methods have been developed since Appendix X9 in Practice E1300 that are more applicable for different loading cases and support conditions and that can accommodate 3-ply and multi-ply laminates. Some of these include cantilevered glass, fins, and plates. The glass strength task group of the E06.52 subcommittee determined that rather than extend the Appendix of Practice E1300, a new standard should be authored that could be subsequently referenced by Practice E1300 and Practice E2751 following its issuance.
Work Item Status
Date Initiated: 01-18-2022
Technical Contact: Adam Nizich
Item: 001
Ballot: E06.52 (24-01)
Status: Negative Votes Need Resolution