STRUCTURAL GLASS FACADES - USC School of Architecture

problematic, as the structures are less accommodating to add-on systems such as awnings
and louvers.
Geometric flexibility: Form variation is more challenging than with simple trusses, and
consequently most applications of this system are relatively simple in overall form, but
significant variation is achievable. Truss designs at the interface between geometry
changes, as at corners, can become complex.
Design issues: The glass plane is extended out from the truss body and restrained against
out-of-plane lateral movement by the truss. The vertical dead load of the glass is typically
carried by a suspended dead load cable running immediately behind the glass plane and
supporting the ends of the extended bracing struts. Deflection due to the weight of the
glazing on the overhead structure should be accounted for in the design and installation of
the truss system.
Form-finding: Not required.
Glass system interface: The glass system generally fixes to the extended end of a bracing
strut that defines the glazing plane. A spider or clamp can be located here for a frameless
system, or the strut ends can support a structural vertical or horizontal mullion.
Resources and Technology
Maturity: Relatively mature system type from the standpoint of employed technology.
Materials and Processes: Fabricated steel mast trusses and bracing, stainless steel rod or
cable bracing elements, and hardware comprise the bulk of these systems. All trusses and
hollow section components should be welded closed to prevent internal moisture and
rusting. Top quality paint finishes with manufacturer’s recommended surface preparation
should be used on all mild-steel surfaces.
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