A lumber floor joist is designed from Douglas Fir-Larch number 1 and better. The joist is...

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Civil Engineering

A lumber floor joist is designed from Douglas Fir-Larch number 1and better. The joist is simply supported over a span of 12' and ispart of a floor system that includes repetitive joist framing at16" o.c and a plywood subfloor. Assume dry and normal temperatureservice conditions. The joist carries 25 plf of dead load and 55plf of live load. Size the joist.

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