Types and details of bridge construction by Skinner Frank Woodward 1858-

Author:Skinner, Frank Woodward, 1858-
Language: eng
Format: epub
Tags: Bridges
Publisher: New York McGraw Publishong Co
Published: 1904-03-25T05:00:00+00:00

sway-brace frames riveted to the horizontal connection plates on the inside flange angles. Up to 50 ft. the top and bottom flanges are parallel and the ends are square. Spans of 36 ft. are 4 ft. deep. The flange angles project about | in. beyond the edges of the web. Vertical web-stiffener angles are in pairs symmetrically placed on opposite sides of the web, and have fillers of the thickness of the flange angles, which at web splices are wide enough for four vertical rows of rivets.

At splices the web flanges of the stiffener angles are reversed and their outstanding angles have their backs in the same transverse- plane, one on each web section. The end web-stiffener angles have flange cover plates with short ends bent at right angles over the top flanges. The 50-ft. girders are 4 ft. deep with 4 X 6-in. flange angles and 9-in. cover plates. The 3 X 3-in. web-stiffener angles are from 3^ to 6 ft. apart. Both end bearings are simple sole plates planed and anchor-bolted through flat-planed bed plates with guide strips riveted on each side to engage the edges of the sole plate.

The 50-ft. spans are the same, except that they are 5^ ft. deep, and have the 4-in. legs of the flange angles riveted to the webs, and the 6-in. legs riveted to 12-in. cover plates. The 70-ft. spans are 6^ ft. deep for 46 ft. 8 in. in the center, and their bottom flanges in type II are beveled to make them only 5 ft. deep at the ends. They have 6 x 6-in. flange angles spliced with 5 X 5-in. cover angles. The cover plates are 18 in. wide next to the flange angles and 12 in. wide outside. Shoes are riveted to the ends of the bottom flanges, and have 4-in. pins engaging pedestals which at the fixed ends are seated on cellular cast bed plates and at the expansion ends are seated on nests of 3i-in. rollers in dust-proof frames with curved side bars.

Type I is like type II, except that the web is of uniform depth throughout. In some cases there are special rocker-pin bearings for the expansion ends. The 75-ft. through plate-girder spans have their upper corners rounded and the top flange angles bent to a radius of 3 ft. and continued down vertically to the lower flanges where they are mitered together. In these spans the floorbeam webs are made in three pieces, and the short end sections project beyond the top flanges to make triangular kneebrace gusset connection plates extending to the top flanges of the main girders and field-riveted through their entire length to the vertical web-stiffener angles. The

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