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585_Mechanics Homework Mechanics of Materials Solution

585_Mechanics Homework Mechanics of Materials Solution -...

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Unformatted text preview: 5.10} Each of the three rolled-steel beams shown (numbered 1, 2, and 3) is to carry a PROBLEM 5.102 64-Irip load uniformly distributed over the beam. Each of these beams has a lZ-fi span and is to be supported by the two 24-fi rolled—steel girders AC and BD. Knowing that the allowable normal stress for the steel used is 24 ksi, select (a) the most economical S-shape for the three beams, (b) the most economical W—shape for the two girders. S. 102 Solve Prob. 5.101, assuming that the 64-kip distributed loads are replaced by 64- kip eminentrated loads applied at the midpoint: of the three beams. SOLUTION Beams 1, 2, and 3 :3 , w tflJ 1"”; .; L l 15.51 :- Sm = 1M1 neg} fi’m (atUse Sloréé - «:3 Beams AC and ED 31 32 3216?; Areas Undev- shear- 4.13»... mom . m: In}: +‘+ (930;) = In k6,. H ‘1'? ‘* L 3 Maximum M a [12+ 122 ~.- molar-fl :- se'io k’P-in. Vtkéefl us (H Us: “127189 dl ...
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