310
Structure: Dimensions
Penetrations are limited not only by structural considerations but also
for planning reasons. Penetrations which require bearing walls or
continuous enclosures such as shafts should interfere as little as
possible with the free area established in both the functional and
service zones. For instance, in the nursing areas, vertical service
shafts should never be placed within space modules. Their location
must also be carefully coordinated with the organization of the service
distribution so that they do not disrupt the passage of main horizontal
distribution lines in the service zone. For this reason, the preferred
location for such elements (e.g., elevator shafts) is outside the service
module or at the perimeter furthest away from the service bay.
1. Depressions. A three-inch topping slab of lightweight concrete will
accommodate all depressions required in the floor for floor-mounted
fixtures and floor drains. Items such as prefabricated audiometric
rooms which have a floor thickness greater than 3" will necessitate a
ramped threshold to take up the difference in floor levels. At opening
configuration, the structural floor slab may be depressed if necessary,
provided that the same limitations described in Paragraph 2 above are
observed.
313.5.5
Shear Elements
1. Size (plan length and thickness). The required plan length and
thickness of shear elements is a function of building height, geographic
location and extent of other elements in the building which will resist
horizontal forces. The maximum dimensions will result from design for
UBC earthquake zone 3, the zone of greatest earthquake
susceptibility. The level of lateral loads obtained using UBC
regulations for this zone are roughly equivalent to the wind loads for
the 45 or 50 wind-pressure areas.
2. Penetration through shear resisting elements. Figure 310-3 illustrates
the organization of typical penetrations for service distribution elements
that are likely to occur in the solid wall separating a typical service bay
from the rest of the service module. In the functional zone, an
opening, approximately seven feet wide by seven feet high will
accommodate the door between the stairs and a relocatable corridor.
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