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What is Tributary Area?

The Tributary area is the area around the column that is surrounded by the centerline, which transfers the load of the column to the ground.

Let us consider the slab supported by the beam and column as an example. The amount of load transferred to any member can be determined using the tributary area (loading) concept. The shape of the supporting area is determined by the geometry of the formation.

Most often, designers use the tributary area to calculate the load transfer from the slab to the column and to calculate the reactions of the framing beams of the column.

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