By Richard A. Behr
Glass is more and more getting used as a structural fabric in new structures. The structural envelope might consist both fullyyt or partly of glass, and this development to eschew conventional fabrics similar to brick and urban for steel-framed, glass clad structures offers inherent difficulties. a tremendous factor is the functionality of glazing in the course of earthquakes and severe climatic occasions, equivalent to windstorms and heavy snow lots. This authoritative ebook reports the present state-of-the paintings in glass and glazing know-how to withstand failure as a result of those average occasions.
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Extra resources for Architectural Glass to Resist Seismic and Extreme Climatic Events
The study showed that the use of IG units with a laminated pane had a signiﬁcant beneﬁcial effect on the seismic serviceability of glass when these IG units, consisting of AN inboard/laminated AN outboard were compared to IG units constructed with two panes of AN monolithic glass or when compared to standard, non-IG single pane laminated AN glass units. For example, test results showed that drift at cracking of IG units with 6 mm (14 in) AN monolithic glass inner pane with laminated outer pane IG units was about 20% higher than AN monolithic cracking drift in IG units constructed exclusively with 6 mm (14 in) AN monolithic glass panes.
Therefore, the seismic requirements are a function of the relative displacement demand Dp and the glass relative displacement capacity Δfallout. 9 of ASCE 7-05 for architectural glass are as follows: Dfallout ! 6, Recommended Dynamic Test Method for Determining the Seismic Drift Causing Glass Fallout from a Wall System (AAMA, 2001), or as determined by engineering analysis. 4 of this chapter). It should be noted that the seismic requirement for glass only applies to buildings assigned to Seismic Design Category C, D, E, or F.
6. The accuracy of this assumption can best be checked by full-scale testing. 19 shows the results of an extensive program of dynamic racking experiments carried out on several different types of glazing system conﬁgurations of the size shown in Fig. 18 (Behr, 1998). The plotted results show the drift values at the ﬁrst initial contact between the glass corner and glazing frame, the drift values at the ﬁrst cracking, and the drift values at Δfallout. The results shown are average values of the number of tests indicated at the bottom of the ﬁgure.
Architectural Glass to Resist Seismic and Extreme Climatic Events by Richard A. Behr