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Steel Designers' Manual - 6th Edition (2003)
Fig. 2.2 Foundation savings
Building use
20% reduction
approximate
rot t foundation piled foundation
The building use will dictate the planning module of the building, which will in turn
determine the span and column grids. Typical grids may be based on a planning
module of 600/1200 mm or 500/1500 mm. However, the use has much wider impact,
particularly on floor loadings and building services. The structural arrangement, and
depth selected, must satisfy and accommodate these requirements.
For example, financial-dealing floors require clear open spaces located on the
lower floors, which would dictate a different structural solution to the rest of the
building.This may necessitate the use of a transfer structure to carry the upper floors
on an economical column grid (Fig. 2.3).
Floor loadings
Factors influencing choice of form 47
Because steel-framed buildings are relatively light in weight, excessive imposed
loadings will have a greater effect on the sizing of structural components, particularly
floor beams, than with reinforced concrete structures.
The floor loadings to be supported by the structure have two components:
• The permanent or dead loading comprising the self-weight of the flooring and
the supporting structure together with the weight of finishes, raised flooring,
ceiling, air-conditioning ducts and equipment.