Highway bridges and culverts . t-iron tensionweb members was extensively built. It has now gone out of use,except in some remote districts where economy of first cost is abso-lutely essential. In these bridges cast-iron joint blocks were usedat the joints where the web members intersected the chords. The Pratt type of truss, more or less modified frequently in con-sequence of the varying depth of truss, is much used and makes anexcellent style of bridge. It is adapted to almost any length ofspan from 100 feet up. The Warren truss with riveted joints, formerly much known asa lattice girder, is
Highway bridges and culverts . t-iron tensionweb members was extensively built. It has now gone out of use,except in some remote districts where economy of first cost is abso-lutely essential. In these bridges cast-iron joint blocks were usedat the joints where the web members intersected the chords. The Pratt type of truss, more or less modified frequently in con-sequence of the varying depth of truss, is much used and makes anexcellent style of bridge. It is adapted to almost any length ofspan from 100 feet up. The Warren truss with riveted joints, formerly much known asa lattice girder, is an excellent bridge for highway purposes forlengths of span from 60 or 70 up to 100 feet or more in locationswhere the plate girder would be too expensive. In fact, except forlocations where the operation of riveting in the field is too trouble-some or expensive, this type of bridge has great excellence for almostany length of span up to as much as 200 feet. Bui. 43, Office of Public Roads, U. S. Dept. of Agriculture. Plate Fig. 1 .—Destruction of a Culvert Constructed Without Wing Walls.
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Keywords: ., bookauthorhoytchar, bookcentury1900, bookdecade1910, bookyear1912
