310
Structure: Loading
314
LOADING
314.1
VERTICAL LOADS
314.1.1
Vertical loads are a combination of dead loads and live loads. The dead
loads include the weight of the permanent structure, the ceiling, partitions,
topping slab, floor finishes, and mechanical loads. Mechanical loads
include ducts, pipes and temporary construction loads but exclude the
weight of the equipment. Live loads include all other weights which will be
applied to the structure.
314.1.2
The structural design of the framing system for the Prototype Design will
be based on two categories of live loading. The first will permit a uniform
live load of 75 psf, mainly in the nursing areas; the second will be based
on a uniform live load of 115 psf, in the support areas of the hospital. For
convenience, these two categories are termed Class 75 and Class 115
design loading respectively. Changes in class of design loading should
always occur at logical places in the structure such as over girders or at
the boundaries of fire sections. Preferably, only one class of design
loading would be used on any one floor of the hospital.
314.1.3
Certain facilities which may be included in the hospital may actually be
required by code to have live load capability in excess of 115 psf. For
instance, the National Building Code requires card file rooms to have 125
psf live load capability. These areas are often interspersed with others
having requirements lower than 115 psf, so they can generally be
balanced to fit within Class 115 design loading.
314.1.4
A concentrated load of 2500 pounds over a three by three-foot area in any
hundred square feet can be accommodated by both Class 75 and Class
115 loading. The framing system will also be able to accommodate
certain higher concentrated loads applied over limited areas. By
incorporating structural devices such as demountable slab strongbacks
(placed beneath the slab and between the beams), it should be possible
for an A/E under certain conditions to accommodate these higher
concentrated live loads without changing the system. Items generating
these higher loads are listed in Table 310-1 under the category of Modified
Class 115 Design Loading. The conditions under which higher loads may
be accommodated are dependent upon the specific plan, the beam spans
chosen, and the degree of interference with the service distribution
elements which would result (See Section 224).
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