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The action of materials under stress; or, Structural mechanics. comprising the strength and resistance of materials and elements of structural design, with examples and problems
Charles Ezra Greene
Paperback. RareBooksClub.com 2012-05-17.
ISBN 9781236063519
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Publisher description
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. 1897 Excerpt: ... at the opposite edge, if the centre is in the middle of h, drops to zero. That is /"--f or y0yl-r-r2--1. This will occur when ya = r2-f-yu y0 then being, for the rectangle, and for the circle, d. Hence, for a rectangular section in masonry, the centre of pressure must not deviate from the centre of figure more than one-sixth of the breadth in either direction, if the unit stress at the more remote edge is not to be allowed to become zero or tension. As masonry joints are supposed, in many cases, not to be subjected to tension in any part, the above statement is equivalent to saying that the centre of pressure or line of the resultant thrust must always lie within the middle third of any joint. Likewise, for two cylindrical blocks in end contact, the centre of pressure should fall within the middle fourth of the diameter, if the pressure is assumed to be uniformly varying and it is not permissible to have the joint tend either to open or to carry tension at the farther edge. The unit pressure at the most pressed edge of a rectangle can be found for any deviation y0. 1st. When the stress is over the whole joint, as before, 2d. When compression alone is possible, and only a part of the surface of the joint is under stress. The distance from the most pressed edge to the action line of P is h--y0. The entire pressed area = 3(3/2--y0) since the ordinates representing stresses make a wedge whose length along y is three times the distance of P from the most pressed edge. P = if-Zh-y0 )b;f= fP--ya )b. If the case is that of a wall, and P is the resultant force per unit of length, b = 1. As y0 increases, f increases, until finally the stone crushes at the edge of the joint, or shears on an oblique plane as described in § 23. Sometimes the pressure is not w
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The action of materials under stress; or, Structural mechanics. comprising the strength and resistance of materials and elements of structural design, with examples and problems
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