Use Fy = 50 ksi steel for a11 problems The weight of the beam has NOT been .incl

Question

Use Fy = 50 ksi steel for a11 problems The weight of the beam has NOT been .included any loads given. A 25'-0" beam supports a dead load of 1 klf and a live load of 3.2 klf Select (he lightest satisfactory section if bracing is provided at the ends of the beam only. A 27'-0" beam supports a continuous dead load of I Iclf. At third points on the beam, a concentrated live load of 36 kips is also supported by the beam. Lateral bracing is provided at the ends of the beam only Redesign the beam from problem 2 assuming lateral brasini 1S provided at third points of the beam (Lb - 9-0").

Explanation / Answer

a. W21x44 made from 50ksi steel with phi b Mp)=358kip-ft
b. Lb=10 Factor moment 290ft-kips
50ksi steel
Cb=1
Lp=4.49 ft
Lr=12 ft
Phi b)Mr=205 kip-ft
Phi b Mp=294 kip ft
BF=11.7kips
Wu=(1.2 Wd)1.6wl=(1.2)(1)(1.6x3.2)=6.144
c)Lb<equal to Lp
Lp=1.76ryx(E/Fy)
Where Fy=50

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