710
Design Rationale: The Space Module
b. Columns may occur along the center line of any building 81 feet or
greater in width. This satisfies the requirements stated above:
(1) Two column-free areas measuring at least 40 feet in their short
dimensions are provided.
(2) The most narrow core possible (assuming the widest sanitary
zone) is over 16 feet in width, i.e., a double row of small rooms.
This core is wide enough to accept a central column.
(3) Corridor location is unaffected by the columns.
c. Columns may occur 18 feet (to column centerline) within the
perimeter of any building 58'6" or greater in width. This also
satisfies the requirements stated above:
(1) One column-free area measuring at least 40 feet in its short
dimension is provided.
(2) The core is completely free of columns.
(3) Corridor location is unaffected by columns.
This column location, implying an asymmetric cantilever, is based on
the fact that the most constant and predictable dimension on the
nursing floor is the clear depth required for bedrooms. This has
been set at 15'6". (See ergonomic studies in Section 230.)
Eighteen feet is the sum of:
(1) the required clear space (inside face of exterior wall to outside
face of column)
(2) one-half the maximum depth of the column (36"/2 = 18")
(3) one foot maximum allowable thickness of exterior wall.
In this location the column will fall either on the boundary between
the bedroom and the corridor (sanitary zone 1) or it will be absorbed
within the sanitary zone (sanitary zones 2 and 3).
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