Treatise On The Theory Of The Construction Of Bridges And Roofs Illustrated Second Edition Revised And Corrected

Author : De Volson Wood
Publisher : Rarebooksclub.com
ISBN 13 : 9781230170343
Total Pages : 64 pages
Book Rating : 4.1/5 (73 download)

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Download or read book Treatise on the Theory of the Construction of Bridges and Roads written by De Volson Wood and published by Rarebooksclub.com. This book was released on 2013-09 with total page 64 pages. Available in PDF, EPUB and Kindle. Book excerpt: 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. 1893 edition. Excerpt: ... is uniform, and then adding the effect of the extra load or loads which are applied at the joint or joints. Note 3.--As a check upon the work the problem may be solved geometrically and the results determined by a scale. There are several ways of doing this. One is by the method used in Fig 60. Another is by the method of diagrams as developed by Rankine and Clerk Maxwell, and which is illustrated in Figs. 40 and 41. The latter method when well understood is easily applied and gives satisfactory results. Geometrical methods are exceedingly valuable for securing general results, and checking analytical work. They are more reliable for general results than analytical methods, for large errors are less likely to happen; but they are not as precise, for they do not give the nearest fraction as certainly as numerical computations do. 114.--Stress Upon The Chords.--The maximum stress upon all parts of the chords, for equal weights at the joints, exists when all the joints are loaded. Remembering that for statical equilibrium the algebraic sum of the moments of all the external forces will be zero, and we readily find the reaction V1 of the support, Fig. 80, by taking the moments of all the weights and the reaction, about the point g. To find the internal stress, we may conceive that one of the chords is severed; as, for instance, the bay 3--4, Fig. 80, and suppose that an exter rial force is substituted for the stress. Then take the origin of moments at the point about which the system would turn if the 3tress-force were removed. Thus, if the bay 3--4 be severed, the system will evidently tend to turn about c. It will generally tend to turn about that joint which is nearer the centre, for a uniform load. In this case if d3 were in action, ..