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Tributary Area

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I have always taken the tributary area as that area
that (con)tributes to the beam's load in a
"calculation" sense, ie half the floor span times the
beam span.

It could be argued that a parcel of load only 1" from
the far support contributes to the beam's load, but
it's not intuitive to me that it should be considered
within the "tributary" area.

So, if this is a democracy, I vote for half.

John Riley

--- Nels Roselund <njineer(--nospam--at)> wrote:

> What is the precise definition of Tributary Area for
> figuring live load
> reduction?  The UBC defines it as the area of floor
> or roof supported by the
> member.  If a beam supports one edge of a
> simple-span floor, is the
> tributary areas the span of the beam times width of
> the floor, or is it half
> that area because the beam supports only half the
> floor [the other half is
> supported on the other edge]?  I've seen it done
> both ways, and have done it
> both ways myself.
> Nels Roselund, SE
> South San Gabriel, CA
> njineer(--nospam--at)

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