. Armour engineer. g the columns, is given an archedform and figured as a continuous beam. The arches providecurved brackets which stiffen the columns laterally and which Jan. 1910] GREIFBNHAGEN : EVANSTON TRACK ELEVATION 23 give depth to the beam at the points of greatest shear. Thereare two 1-inch bars in the top of the girder running the fulllength of the pier, and an additional pair of 1-inch bars overeach column, bent down to assist in taking care of web are four 1-inch bars in the bottom of the beam runningthe full length of the pier. Six to eight Vs-inch square stir-rups
. Armour engineer. g the columns, is given an archedform and figured as a continuous beam. The arches providecurved brackets which stiffen the columns laterally and which Jan. 1910] GREIFBNHAGEN : EVANSTON TRACK ELEVATION 23 give depth to the beam at the points of greatest shear. Thereare two 1-inch bars in the top of the girder running the fulllength of the pier, and an additional pair of 1-inch bars overeach column, bent down to assist in taking care of web are four 1-inch bars in the bottom of the beam runningthe full length of the pier. Six to eight Vs-inch square stir-rups bent in the shape of a W are placed in the beams be-tween columns, and three such stirrups in each side curved brackets are reinforced by pairs of 1-inch diagonalbars. The top girders are made six inches wider than the col-umns ; this makes their width 24 inches in all cases except themiddle pier at Davis Street, where they are 30 inches depth of the beam at the crown of the arch varies from. Fig. 6. View of Lake Street Subway Bridge. 18 inches to 24 inches. The ends of the cantilevers are cut offperpendicular to the center line of the pier and the concreteslabs are allowed to project beyond the extreme corner, whichgives a better appearance and a more satisfactory detail thanwould be obtained if the ends were made parallel and flushwith the slab parapets, because the arrangement adopted elim-inates the sharp corner and warped surface. The column shafts from the ^springing line of the toparches to the top of the base or pedestal vary in height from6 feet to 7 feet 3 inches. The top of the so-called base or pedes-
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Keywords: ., bookcentury1900, bookdecade1910, bookidarmourengine, bookyear1910
