320
Ceiling: Loading
324
LOADING
324.1
IMPACT
All permanent components of the ceiling subsystem (including any
fireproofing, and other surface finishes) must be resistant to impact
resulting from the activities of workmen and maintenance personnel in the
service zone.
324.2
VERTICAL LOADS
The design mechanical load for the ceiling subsystem is 15 psf. This is
sufficient to support part of the service distribution components and light
ceiling mounted items such as light fixtures and cubicle tracks. Besides
the 15 psf mechanical load, an additional 25 psf live-load capacity must be
provided for construction or maintenance workmen and for temporary
construction loads during initial construction or remodeling. This extra 25
psf capacity also allows for local concentrations of mechanical equipment
and local ceiling-hung concentrations in the range of 100 pounds in any
100 square feet. Heavier equipment must be supported by the floor below
or hung directly from the structure above. (See Figure 320-8.) Exact
capacities for ceiling load concentrations will depend on the individual
design.
The ceiling should also be capable of withstanding upward point loads of
at least 25 pounds over a six-inch square area without appreciable
deformation.
324.3
LATERAL LOADS
The ceiling is not required to contribute to the lateral force resistance of
the structure, but it must transmit all lateral forces developed in partitions,
as well as within the ceiling itself, to the structure. (See Section 334.2.)
Design which do not require diagonal bracing in order to transmit the
lateral loads are preferred.
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