220
The Service Module: Size and Shape
222
SIZE AND SHAPE
222.1
RANGE OF SIZES
The overall dimensions of service modules, exclusive of service bays, vary
in length in increments of 22'6", and in width in increments of 4'6".
The full range of simple rectangular areas available as service modules,
exclusive of service bays, is fixed by structural, services distribution and
fire safety considerations. (See Figure 220-2.)
222.1.1
Thermal Expansion Joints
Shear wall locations are limited to the perimeter of service modules,
except that they may occur within the service bays. In fact, the wall
between a service bay and the rest of the module in which it occurs will
normally be a shear wall. Since independent structural units, as defined
by thermal expansion joints, cannot exceed 300 feet in any dimension,
and each such unit must have a reasonably balanced array of shear walls,
most design configurations will involve shear walls spaced closer than 300
feet. Thus, the maximum dimension of a service module could not be
larger than this figure.
222.1.2
Diaphragm Proportion
In the patient bedroom areas, where service modules are made up largely
of space modules, each service module would have at least two opposite
boundaries at exterior walls. Floor slabs, acting as diaphragms spanning
between two shear walls, should not exceed a proportion of three to one in
length to width.
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