# Stresses in Simple Trusses. 1888. PT. II. Graphic Statics. 1890. PT. III. Bridge Design. 1st Ed. 1st Thousand. 1894. PT. IV. Higher Structures. 1st Thousand. 1898

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This historic book may have numerous typos and missing text. Purchasers can usually download a free scanned copy of the original book (without typos) from the publisher. Not indexed. Not illustrated. 1890 edition. Excerpt: ...chord produced at 105 feet to the left of A, the lever arm of Cd is 92.27 feet, and the stress is found from the equation--13.75 X 105 + 2-5 (I2 + 135) + S X92.27 = whence S" =-f 8.7. For live load on the left the stress in Cd is and the counter Dc comes into action. To find the stress for Dc, we have--17.5 X 105 + 10(120 + 135)--5 X 88.41 = o, from which S = + 8.0 tons. In the same manner all the other stresses are found and marked on the diagram. The method of resolution of forces can also be used to find the stresses in the diagonals; the load being put on the truss in the proper position and the two adjacent chord stresses being found by moments, the difference of these is the horizontal component of the stress for the given diagonal. The bowstring truss is sometimes built without counter-ties, in which case the main ties take compression as well as tension, like the Warren truss. Prob. 63. Compute the maximum and minimum stresses for the members bc. Cc, Cb, and Bc in Fig. 48. "A Art. 39. The Parabol1c Bowstr1ng Truss. The apex points of the upper chord of a bowstring truss should be so arranged as to lie upon some regular curve, for evident aesthetic reasons. If this curve be a parabola the truss enjoys the remarkable property that under uniform load the diagonals are unstrained and the lower chord stresses are the same in all panels. To prove this let d be the center depth and / the span. Then for a uniform load of w pounds per linear foot the lower chord stress at any distance x from the left support is wlx-- ' y Fig-49 in which y is the lever arm for the lower chord at the section. To find the value of y consider that the equation of the parabola with reference to its vertex is l-x)' = md-y / and since x =...show more

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• Paperback | 34 pages
• 189 x 246 x 2mm | 82g
• United States
• English
• black & white illustrations
• 123694772X
• 9781236947727