i'm trying to work a couple structural problems. question and answer posted below.
dead load = 15#/ft
live load = 40#/ft
total load = 55#/ft
beams are the items labeled B over the footings. joists span perpendicularly.
am i taking a 1 foot "WIDE" section of this?
what is the 15 ft value? they are taking the 1 foot value PERPENDICULAR to the BEAM and showing a "tributary area" of 1' "high" by 15 foot wide (which corresponds to a tributary area based on the width of the bays i guess?
and they leave out "1 ft" because it is "implied" in the question when they ask for the "load per linear foot"?
can you run this example so it is 1 foot linear width running in the same direction as the beam and it is 1 foot wide over the beam and if not why is this?
lastly, i don't see how the final value isn't 825 lb/ft since it seems like one of the feet would cancel out. or actually, i think this example should be technically 55#/ft^2 x 15 ft x 1 ft (implied width) so the answer would be 825#.
can anyone bail me out on this? i am sure there will be one like this or similar to the roof sample problem and would like to understand it better.
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