310
Structure: Special Considerations
316.4
CHANGE OF DIRECTION IN FRAMING (Figures 310-6 and 310-7)
With certain building configurations, it will be necessary to change the
direction of the structural framing members through ninety degrees. The
structural design will be simpler if the beam span involved is 45'0", since
this is an exact multiple of the bay width. In this case, the intersection of
the two girders takes place at a typical column location. (See Figure 310-
6.) If the beam span is not a multiple of the bay width, the design of the
framing is simplified if an additional column can be located at the junction
of the perpendicular girders. (See Figure 310-7.) If columns cannot be
accommodated at these points, then the girders in one direction must be
designed to carry the concentrated load of the girders in the opposite
direction. This increase in load varies from 20-50% above the typical
girder load. In this case, the typical girder dimensions must be increased
approximately as follows:
1. 50% width increase, or
2. 25% depth increase, or
3. a combination of width and depth increase.
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