Revision of the Niagara Railway Arch Bridge . il-road crossing on the American shore, or practically at the shore endof the 115-ft. span. The heavy grade incidental to this made it neces-sary for the heavier freight trains to cross the bridge at speeds of from20 to 30 miles per hour, which were considered unsafe for a bridge ofthis character—so high and directly above the Rapids. Therefore,it was decided to remove this sag by means of steel risers on top ofthe stringers, which also were made to serve as the new top flange ofthese stringers on the American half of the arch and on the
Revision of the Niagara Railway Arch Bridge . il-road crossing on the American shore, or practically at the shore endof the 115-ft. span. The heavy grade incidental to this made it neces-sary for the heavier freight trains to cross the bridge at speeds of from20 to 30 miles per hour, which were considered unsafe for a bridge ofthis character—so high and directly above the Rapids. Therefore,it was decided to remove this sag by means of steel risers on top ofthe stringers, which also were made to serve as the new top flange ofthese stringers on the American half of the arch and on the The rise in the first panel next to the center of the arch wasmade entirely in the 14-in. maple risers of the new floor. The risers in the next two panels consist of four angles telescoped,and, for the remainder of the arch, of four angles and a web-plate, withstiffeners every 4 ft., all risers being tapered to conform to the newgrade. The risers on the 115-ft. span are of Bethlehem H -beams, 10and 12 in. deep, with end stiffeners Fig. 18.—New Sway and Vibration Bracing.
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Keywords: ., bookcentury1900, bookdecade1920, bookidrevisionofni, bookyear1920
