uring construction only the girders and diagonal members have been erected (no s

Question

uring construction only the girders and diagonal members have been erected (no slab/deck or railing). During placement of the wet concrete (no strength yet) a 60 psf live l placed on the bridge (neglect all dea oad (wet concrete plus workers and equipment) is d load for the problem). Select the lightest W- shape of A992 Gr 50 steel based construction (no shear or deflection criteria). Provide the design capacity M.Be as exact as possible in your answer, though use of appropriate tables is acceptable. on Moment capacity during this stage of Show all checks! nnhed to the

Explanation / Answer

span length = 50 ft

total moment = wl2/8

= 60*502/8=225 k-in

LFRD

design moment = 225/0.9=250 k-in

M= fy*Zx

Zx = M/fy = 5 in

from section property

W 4 x 13 with Zx = 5.5 in3

is lightest section for design

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