Trusses And Arches Analyzed And Discussed By Graphical Methods (volume 2)

Paperback | February 5, 2012

byCharles Ezra Greene

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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. 1881. Excerpt: ... between the upper and lower chords, but more particularly to form, with the struts of the lateral bracing at top and bottom, stiff frames to resist lateral distortion. Gusset-pieces also may be riveted in the interior angles between these verticals and the lateral struts. 57. Post Truss.--The type of truss illustrated by Figs. 26, 28, and 29, takes its name from its inventor: it is probably the outgrowth of an endeavor to study economy of material by inclining the struts and ties at the most economical angle. While the length of a tie has no influence on the cross-section necessary to carry safely a certain stress, the dimensions of a strut depend upon its length; and hence, the shorter it can be made, the less its cross-section will be. Mr. S. S. Post proposed, that, calling the distance between loaded points one panel, a tie should extend across one panel and a half, and a strut across one-half of a panel, the height of the truss being one panel and a half; so that the ties should slope at an angle of 45, and the struts at an angle of 18 26', with the vertical. As a tie and a strut together extend over two panels, the web members must form a double system. The counter-ties will also slope at 45, owing to the peculiar arrangement of partrs. The joints in one chord occur midway between those of the other; and it will be noticed that each counter connects the joint of one system with a joint of the other system, thus introducing an element of indetermination into the attempt to find the web-stresses. While this form of truss has been, so far as our knowledge goes, used exclusively as an over-grade or through truss, there appears to be no reason why it may not be employed in a design for a deck-bridge; and, as the method of finding the chord-stresses differ...

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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. 1881. Excerpt: ... between the upper and lower chords, but more particularly to form, with the struts of the lateral bracing at top and bottom, s...

Format:PaperbackDimensions:52 pages, 9.69 × 7.44 × 0.11 inPublished:February 5, 2012Publisher:General Books LLCLanguage:English

The following ISBNs are associated with this title:

ISBN - 10:021765083X

ISBN - 13:9780217650830

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