Engineering and Contracting . -in. gas mains, one undereach sidewalk, 45 lbs. per linear foot each; I--in. gas mains, one under each sidewalk, .33 linear foot each; and wire conduits 200lbs. per linear foot for each sidewalk. The March 1914. EngineeriiTg and Contracting otal dead load for linear foot of span was on the car tracks was used for the trusses as square foot on the exposed surface of both aken at 14,C00 lbs. for the floor system, except that alternate cars trusses and on the bridge floor as seen in ele- Lkc Load for Floor System.—The live load were omitted. The uniform live
Engineering and Contracting . -in. gas mains, one undereach sidewalk, 45 lbs. per linear foot each; I--in. gas mains, one under each sidewalk, .33 linear foot each; and wire conduits 200lbs. per linear foot for each sidewalk. The March 1914. EngineeriiTg and Contracting otal dead load for linear foot of span was on the car tracks was used for the trusses as square foot on the exposed surface of both aken at 14,C00 lbs. for the floor system, except that alternate cars trusses and on the bridge floor as seen in ele- Lkc Load for Floor System.—The live load were omitted. The uniform live load on that vation was used, this load being treated as a er car track consisted of a continuous line part of the roadway not covered by the car moving load. f 52-ton, double-truck cars, each 45 ft. long, tracks was taken at 75 lbs. per square foot. Allowable Stresses.—The following allow- he wheels of each truck were spaced 5 ft. and on the sidewalks it was taken at 50 lbs. able stresses were used; Tension, net section,. dOorali—IV /ieonittna lOSarMriVm OBars !{•! Fig. 1. General Dimensions, Strettes and Section* for 531-rt. Trusses of North Side Point Bridge, Pittsburgh, Pa. centers, trucks of cars were .iiMccil -5 ft. centers, and trucks of adjncciii .ars wereaced l,i) ft. on centers, the two trucks occupy-I? 18 ft. width of The live loadr the roadway on each side of the of a concentrated load of Jo tons ono axles spaced 10 ft. apart with a 5-ft. gage,ciipying a floor space of 9 ft. wide by 18 long, and a uniform load of 100 lbs. peruare foot for all of the roadway surfacet covered by the cars and the ciurntratcdid. The live load for the sidewalk wasken at 100 lbs. per square Load for —The live load per square loot. The total live loail per footof span was taken at 5,3,lii —The impact stresses were com- 150puie<l from the formula I«»S . L + 300 where I = impact stress, S = maximum liveload s
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