Question: cross section. 2 . ( 3 0 points ) A box beam is made by nailing together four boards in the configuration shown. The beam

cross section.
2.(30 points) A box beam is made by nailing together four boards in the configuration shown. The beam supports a concentrated load of 1000 lb at its midspan, and it rests on simple supports. If each nail can withstand an allowable shear force of 150 lb , what is the maximum spacing that can be used?
cross section. 2 . ( 3 0 points ) A box beam is

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