shows the differences between the two. Figure 9-25
shows the differences in crew size due in large part to
the heavier gauge steel required by the ABM 240.
Keep in mind that the information provided in this
section on the K-SPAN building is basic. During the
actual construction of this building, you must consult
the manufacturers complete set of manuals.
TOWERS AND BUNKERS
TOWERS are framework structures designed to
provide vertical support. They may be used to support
another structure, such as a bridge, or they may be used
to support a piece of equipment, such as a
communication antenna or for a lookout post or weapon
mounts. Since the prime purpose of a tower is to
provide vertical support for a load applied at the top, the
compression members, providing this support, are the
only ones that require high-structural strength. The rest
of the structure is designed to stiffen the vertical
members and to prevent bending under load. Primarily,
the bracing members are designed to take loads in
tension and are based on a series of diagonals. Atypical
Figure 9-25.Chart for determining crew size for ABM 240.