310
STRUCTURE
311
BASIC DESIGN (Figure 310-1)
The structural subsystem is designed to accommodate service modules in
a variety of building configurations. It includes a framing system for
vertical loads and a shear wall or braced frame system for lateral force
resistance. A general design approach is described for the structure of
the service bays where the configurations and dimensions are not
predictable. The configurations and dimensions of the rest of the service
module are predictable, however, and a more detailed basic design has
been developed. The basic design is limited to the structure above grade;
it does not include items such as foundations, retaining walls or exterior
walls (See Section 317.2).
311.1
FRAMING SYSTEM FOR VERTICAL LOADS
311.1.1
Typical Structural Bays
The basic framing system consists of columns, girders and beams in
structural bays approximately two to three times as long as they are wide.
The length of the bays is in the span range of forty to sixty feet, the
reasons for which are discussed in Section 721.1.1. The bays are
spanned in the long direction by closely spaced beams of minimum
economic depth, and the beams are supported by, or cantilevered from,
girders of similar depth. The use of short primary members with long
secondary members results in a shallow layer of structure. The roof is
framed in a similar manner, but takes into account different loading
criteria. The rationale for the selection of this type of system is discussed
in Section 721.2.
This framing system can be utilized in the vast majority of the functional
areas of the hospital. It does not apply to service bays and certain
functional areas with exceptionally high live loads or special configuration
requirements which are listed in Table 310-1. The structure in these areas
must be designed by the project A/E as required by the specific
conditions.
311.1.2
Service Bays
The configuration of the service bays will vary but will typically result in a
simple beam and slab floor system, framed as necessary for the layout.
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