Question

Mmax, Sr, Selection, delta LL allow, delta LL max, Deflection ok?

Select the lightest adequate W-section with a nominal depth of 14 in or less, for a 34ft. beam with a total uniformly distributed load of 1000 lb/ft. Select the beam based only on bending stress then check to see if deflection is O.K. LL Allowable deflection = L/360 TL Allowable deflection = L/240 Fb = 2/3 FY Fy = 50,000 lb/in2 LL is 70% of total load

Answer 1

SOLUTION L= 34ft calculate allowsable bending shoess buna rau h = /fy 223x50,000 186 = 33.333 kesi Maneno = wel 1000x(3402 = 144.5 kif 8 Required section modulus Sreq Mmuro Fb = 4.33 X12+52:02 in to Try w 16X45 (S02727 in Ix = 586 in 4) ablactual 144.5*12 7277 3 23.85 ksi O servisi (blactucal - 23.85 % 33,33 ksi calculate total loud Wawl z 1000 x 34 = 348 W = 0.7W = 23.8k L 34 X12 360 = 1.133 360 (Callosbe = alasable deflection

Olactucal WL3 384 EI steel type 3. E = 29x10 این را با او را از 3 (Sadual 5 384 EL 5 384 34* (34x12) 29x100x586 -1.769 (slactual >(Shallowable W 16X95. It's not ok to take 3 take 19 in 4) - 21.40 ksi W 16X50 (sx=81 in I =659 in (&dactual 14415x12 81 (blachual < (8/ alowable 21.40 < 33.33 34X72 31.123 L 360 Sallowable 360 WE' sx (34) (Bux12 = 1,57 5 (actual 384 24x10*659 24 384 EIK Sactal > Scillo@ 1. His not ok w 1650

WI6X67 (sx = 117 · Ix =954) (l)achucal 144.5X12 117 14.82 Obleckerel bullowable WL 5 ( 34 x (Buxw 29x10** 4954 (lactual 5 384 EIX 384 1,086 Suctured & Gallowable 1.086 5 1.133 we use W 16867