. Railway mechanical engineer . e must transmit 6,200 lb. By using the same material for both the side sill splicesand the cover plate splices it can be purchased cheaper andbetter deliveries will be obtained as the 30-ft. lengths areusually carried in stock. The following is the bill of mate-rial for one car: Two 21 in. by Vt in. by 28 ft.—9 in- side sheets (body). Four 21 in. by ^i in. by 7 ft. side sheets (ends). One 21 In. by \i in. by 29 ft. —5 in. center sill cover plate. Two 21 in. by Vi in. by 7 ft.—3).i in. center sill cover plates (ends). March, 1917 RAILWAY MECHANICAL ENGINEER 139 T
. Railway mechanical engineer . e must transmit 6,200 lb. By using the same material for both the side sill splicesand the cover plate splices it can be purchased cheaper andbetter deliveries will be obtained as the 30-ft. lengths areusually carried in stock. The following is the bill of mate-rial for one car: Two 21 in. by Vt in. by 28 ft.—9 in- side sheets (body). Four 21 in. by ^i in. by 7 ft. side sheets (ends). One 21 In. by \i in. by 29 ft. —5 in. center sill cover plate. Two 21 in. by Vi in. by 7 ft.—3).i in. center sill cover plates (ends). March, 1917 RAILWAY MECHANICAL ENGINEER 139 The efficiency of the centre sill cover plate splice is figuredas follows (see Fig. 5): Gross area of plate (A) 5 sq. of the plate is1S = — X 20 X6Eccentricity (e) due to offset = Vi in. (t y .21 Ratio (R) of strength of plate at offset to the strength ofthe straight plate is: 1 E A+¥ That is, the offset reduces the strength of the plate to 29per cent of the strength of the straight plate. ^lxfx23-5. 5-7To Siriker Fig. 5—Splice for Center Sill Cover Plate The efficiency (£) of the splice is equal to the strengthof the riveted joint divided by the strength of the plate. 5 X 16,000 X .29 Where V = lb. (shear value of rivets)f = 16,000 lb. (fibre stress of plate)
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Keywords: ., bookcentury1900, bookdecade1910, booksubjectrailroadengineering
