370
Coordination Checklist
In developing specific designs for the integrated subsystems, it is
imperative that each decision be made in the context of its possible effects
on the characteristics of all other subsystems. The following checklist is
intended to serve as an inventory of compatibility considerations. Table
370-1 summarizes the particular considerations applicable to each
subsystem.
1. The vertical loads of the ceiling must be supported from hangers
attached only to the center of the bottom of beams. Since the spacing
of ceiling hangers is thereby set in one direction by beam spacing,
hanger spacing in the other direction is likewise affected due to the
limited tributary ceiling area which can be supported by each hanger.
That is, as the beam spacing is increased (eg, by using a steel
structure rather than concrete), the ceiling hanger spacing along the
beams must be decreased. Hanger spacing in both directions directly
affects the organization of the service zone into secondary subzones.
(See also item 23 below.)
The detail of the connection between beams and ceiling hangers will
vary with the material selected for the structure. With a concrete
structure, a continuous supporting channel could be cast into the
bottom of the beams and used for the attachment of service
distribution components as well as ceiling hangers. This would be
impractical with steel because of fireproofing requirements. (It is not
intended that the structure and ceiling be fire rated together as an
assembly.) (See Section 321.1.)
2. The acoustic separation between one floor and the next is provided by
the combined effects of flooring, structure and ceiling. (See Section
325.1.)
3. Lateral forces in the partitions must be transmitted to the structure via
the ceiling as well as directed to columns, shear walls and the floor.
Thus the ceiling must be attached to columns and shear walls to
properly transmit these forces. However, the ceiling is assumed to not
contribute to the lateral resistance of the structure. (See Section
324.3.)
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