The Development Of Bridges
This historic book may have numerous typos and missing text. Purchasers can download a free scanned copy of the original book (without typos) from the publisher. Not indexed. Not illustrated. 1920 Excerpt: ...present day work steel lattice girders are very common. The Howe Truss (Figure 12) followed the timber lattice in 1840--the chords and inclined struts being of timber, and the vertical tensio...
Paperback: 36 pages
Publisher: RareBooksClub.com (May 17, 2012)
Product Dimensions: 7.4 x 0.1 x 9.7 inches
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rods of wrought iron. In the Pratt Truss (Figure 12) which was invented a few years later, the web members were differently arranged, so that the shorter vertical members were thrown normally into compression, and were of timber,. while the longer inclined members, subjected to tensile stresses, were of metal. Timber or composite trusses of both these types were largely used in the middle 19th century in America--more so than in Europe, and the Howe truss is still used where timber is particularly the N. or Pratt truss--are largely used all over the world. The Warren Girder is another popular form of truss for moderate spans, and as may be seen from page 104 it is composed of a series of equilateral triangles. Newark Dyke Bridge (1851-3) over the Trent, was probably the earliest example of a bridge in which the Warren girder was employed. Modifications of the simple Warren are shown in Figure 12, being formed (1) by the addition of vertical members when the panels would otherwise be very large, and (ii) by the superposition of two simple Warrens to form a " double Warren " or " single lattice girder." The multiple intersection lattice (figure 12) may be looked upon as formed by the superposition of several simple Warrens. The Whipple Murphy or Linville truss, which may be considered as the result of the superposition of two N trusses, is shown in Figure 12. The design is due to Whipple, an American Engineer, and dates from about 1847. The Bollman and Fink types which may be considered as combinations of several King Post trusses, date from 1850 and...