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Re: laminated or double glass modeling

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You need equations that deal with the support from the air space between the panes.  The Canadian code Can/CGSB-12.20-M89 has such equations that will provide all the data and equations you need.  It's a bit too big to copy (and there's copyright) but you can get a copy from Global Engineering Documents at http//
The other aspect is that under snow, or "long duration" loading, the laminated glass creeps and that reduces the "reference" strength of the unit.

Thor A Tandy  P.Eng, MIPENZ
Victoria BC
e-mail: vicpeng(--nospam--at)
----- Original Message -----
Sent: Wednesday, February 05, 2003 4:54 PM
Subject: laminated or double glass modeling

in any structural analysis software When I model a plate of a double glass unit consists of 1/4"out panel - 1/2 air space - 1/4 inner panel or laminated glass 1/4" glass + 1/32" interlayer PVB+ 1/4"glass, What is the equivalent monolithic thickness of the composite plate in the mentioned two cases (case of double glass panel and case of laminated glass panel)

Ahmed Khalil
Advanced Structures Inc.
4094 Glencoe Ave.
Marina Del Rey,CA90292,USA
T:310-301-1984 ext. 232(.2084 Fax)

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