STRUCTURAL GLASS FACADES - USC School of Architecture

Geometric flexibility: One of the advantages of point-fixed systems is the relative ease with
which planar transitions in the glass surface can be accommodated.
Design issues: Bolts can be countersunk and flush with the glass surface, or a low profile
round headed bolt can be used in a through-hole. The joint size is a function of the thickness
of the glass and should be determined in consultation with the glass provider. The number
and location of holes is a function of glass size and design loads, and must be determined
by a qualified engineer experienced with glass. The bridging component which ties the glass
to the backer structure can range from a custom cast stainless steel component, as with a
spider type fitting, to a simple spring plate fashioned from bent metal plate. It is important
that the glass-fixings provide for two considerations; accommodation of field tolerances with
respect to the location of the interface point at the backer structure, and accommodation of
movement of the structure and glass under design loads.
Glass System Interface: The interface
is comprised of a glass bolt and a
bridging component that ties the bolt to
the backer structure.
Glass type: Glass specification and
supply is a critical issue with this
system. Tempered glass is typically
Figure 6.16 Point-fixed bolted system with spider fitting
and insulated glass.
required, and laminated glass in
required in any application sloped off
the vertical 15 degrees or more.
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