Commonly, designers use tributary area in columns for transferring loads from slabs to columns or compute reactions of the beams framing into the columns. The application of the former method is more common.
Tributary Area in Column
The area surrounding the column bounded by the centerline of the panel is the tributary area on which loads are supported by the column at the
In Fig. 2, tributary areas for column Z (corner column), Column Y (edge column), and Column X (
When the tributary area is used, the position of floor beams is not taken into consideration, but an allowance for their weight is included.
Designers can use the