Unformatted text preview: 5.10} Each of the three rolledsteel beams shown (numbered 1, 2, and 3) is to carry a
PROBLEM 5.102 64Irip load uniformly distributed over the beam. Each of these beams has a lZﬁ span
and is to be supported by the two 24ﬁ rolled—steel girders AC and BD. Knowing that
the allowable normal stress for the steel used is 24 ksi, select (a) the most economical
Sshape for the three beams, (b) the most economical W—shape for the two girders. S. 102 Solve Prob. 5.101, assuming that the 64kip 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 ~. molarﬂ : se'io k’Pin.
Vtkéeﬂ
us (H Us: “127189 dl ...
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 Summer '10
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