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Bearing on masonry

Fill-in blanks:
1. According to IBC, the ends of masonry supported wood beams or girders, must have at least ____ inches bearing.
A wood beam, 3.5" douglas fir-larch no.2, spanning 10 feet supports a combined dead and roof live load of 300 plf.
2. Total reaction of the beam is R = ______ lbf. Allowable compression perpendicular to grain for this beam is 625 lbf/sqin.
3. Required bearing area is A = ____ sqin.
Answer1. 3 inches, 2. R= (300)(10)/2 = 1500 lbf, 3. A = 1500/625 = 2.4 sqin., 2.4/3.5 = .685 in. which is less than the code minimum of 3 in. Therefore, the required bearing is 3 inches.

ARE 4.0 exam prep: BDCS

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