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. 1870 Excerpt: ...which would be quite invisible to the eye; so that we may consider that a permanent load of at least 16 tons may be safely laid on the centre of this beam; and this is about one-fourth of its breaking-weight. Page 94. The value of the modulus E varies according to the quality of the iron used, and can readily be found ...
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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. 1870 Excerpt: ...which would be quite invisible to the eye; so that we may consider that a permanent load of at least 16 tons may be safely laid on the centre of this beam; and this is about one-fourth of its breaking-weight. Page 94. The value of the modulus E varies according to the quality of the iron used, and can readily be found by experiment. When the load is uniformly distributed over the entire length of the beam, the deflexion is five-eighths of that produced by the same load placed at the middle. So that the deflexion due to the weight of the beam itself is five-eighths of that which would be produced if its whole weight were concentrated at the middle and the beam itself supposed without weight. Also, in calculating the deflexion of a beam by a given load, we must add five-eighths of the beam's own weight to the load laid on the middle, to get the true strain. In the last example, the weight of the beam is not considered; but as this amounts to 3 tons, the true deflexion will be that due to 33 + f 3, or nearly 35 tons. The true value of D is therefore 1-3 inch. 51. When a mass of iron is exposed to alterations of temperature, it continually changes its dimensions, being larger at a high temperature than at a low one; that is to say, it expands in dimension as the temperature increases. When the temperature rises from 32 Fahrenheit to 212, iron expands the 900th part of each dimension, its relative proportions remaining the same. Thus a bar of iron 75 feet long will expand EFFECT OF TEMPERATURE ON IRON; ROOFS. 101 1 iiich ill length while passing from 32 to 212, or through 180 of temperature. When iron is used in construction it is exposed in this country to a variation of about 90 during the year, so that a beam 75 feet long will alter half an inch in length bet...
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Add this copy of The Science of Building to cart. $16.27, new condition, Sold by Ingram Customer Returns Center rated 5.0 out of 5 stars, ships from NV, USA, published 2022 by Legare Street Press.
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