. Manual for railroad engineers and engineering students : containing the rules and tables needed for the location, construction, and equipment of railroads as built in the United States . shown in Fig. 68. In practice, the upper chords are commonlycarried out, as in the Fig., to A and B, and posts introduced atthe ends. (See Plate VI.) In this bridge the braces are inclined up Fig. 78. towards the centre, and the tension rods are vertical. Fig. Jj isa modification of Fig. j6, made simply by applying an interme- ON THE STRAINS IN GIRDERS. 189 diatc system of braces and ties of the same kind, t
. Manual for railroad engineers and engineering students : containing the rules and tables needed for the location, construction, and equipment of railroads as built in the United States . shown in Fig. 68. In practice, the upper chords are commonlycarried out, as in the Fig., to A and B, and posts introduced atthe ends. (See Plate VI.) In this bridge the braces are inclined up Fig. 78. towards the centre, and the tension rods are vertical. Fig. Jj isa modification of Fig. j6, made simply by applying an interme- ON THE STRAINS IN GIRDERS. 189 diatc system of braces and ties of the same kind, the chordsbeing common to both systems. Fig. 78 shows the Pratt, orWhipple Bridge, in its simplest form, the compression members. being vertical, and the tension members inclined down towardsthe centre. Fig. 79 is a modification of the same, made by intro-ducing an intermediate system. Fig. 80 is another modification X N/ X X y y y y Fisr. So. of the same, where it is found necessary to support the roadwayat frequent intervals. Fig. 81 shows the Warren Girder, theroadway being upon the lower chord. Intermediate points, as
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Keywords: ., bookcentury1800, bookdecade1880, bookpublisherbosto, bookyear1883
