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Tributary Area

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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