Chicago : Engineering and Contracting Pub. Co. · leaf 403
tof steel were computed by the straight line 388 ENGINEERING & CONTRACTING Vol. XXXVI. No. 15. formula, using n = 12. The working stresson the steel was taken as 10,000 lbs. per sq.in., a factor of safety of about 3V& on theelastic limit. The working stress on theconcrete varied between 400… … lbs., d = 12 ins., and the steel per ft. = 0.55sq. in. or about %-in. bars on 12-in. centers. The computations for spring line and sidewall are made in the same way, using thevertical reaction instead of the thrust in com-puting direct compression. The amount of cover, concrete added, in theabove…
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