The Theory And Practice of Modern Framed Structures: Designed for the Use of ...
The Theory And Practice of Modern Framed Structures: Designed for the Use of ...
Johnson, J. B. (John Butler), 1850-1902
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per square foot assumed for the joist. The maxi- mum bending moment, dead and live, on the joist is * ^ — — -^ = 77,600 in.-lbs., 8 requiring a joist 2\ X 12 inches. The weight of the timber in the sidewalk floors is 164 lbs. per linear foot of bridge. The sidewalk floor plank are usually extended to close the open- ings between the roadway and sidewalks made by the trusses. 358. The Design of the- Floor-beam. — The dead and live loads on the beam are as 8.35- -Uve Load 240U0 Ibsr- -Dead- -8800...1bftr- -za^ Fio. 377- shown in Fig. 377. The maximum bending moment occurs at the middle of the beam where the sidewalks are unloaded and is 64,300 ft.-lbs. The depth of the economical floor-beam, using a web plate \ inch thick and using one eighth of the gross area of the web as available equivalent flange area, is 20 inches deep. Assuming the depth centre to centre of gravity of the flanges as i8i inches, the flange stress is 41,700 lbs., requiring 3.48 square inches net area of lower flange or 2.86 square inches net area in the flange angles after deducting the equivalent flange area of the web.
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