STRUCTURAL GLASS FACADES - USC School of Architecture

3.3.1.2 Develop an appropriate surface geometry and
glazing grid
This is the foundation point of a façade design, regardless of structure type, glazing type or
other considerations. The definition of the glass grid will inform the subsequent decisionmaking
process.
3.3.1.3 Select a glass system type
Point-fixed systems are most commonly used with structural glass facades, but may not be
the cheapest solution if cost is the predominant consideration. Options are discussed in
chapters 2 and 6.
3.3.1.4 Select a structure type
Evaluate and select a structure type to function as the structural support system for the
façade. The various systems are quite flexible in terms of supporting any of the glass system
options. Structure options are discussed in chapters 2 and 6.
3.3.1.5 Execute a preliminary structure analysis
A preliminary analysis of the structure should represent a reasonably close approximation of
the final design, within 10 to 15 percent. Assumed member sizes will be tested as a function
system deflection, and adjusted as appropriate. The analysis should yield preliminary
deflections, member loads and reactions. Determination of member sizes can then be used
for costing purposes. Reaction loads are important to the building engineer in the sizing of
boundary steel supporting the façade structural system.
3.3.1.6 Develop a preliminary cost estimate
The output from the preliminary analysis combined with the selections for glass and glass
system should provide for a close approximation cost estimate for budgeting purposes. At
146