The Theory of Strains in Girders and Similar Structures: With Observations of the Application of Theory to Practice, and Tables of the Strength and Other Properties of Materials
D. Van Nostrand, 1873 - 632 páginas
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The Theory of Strains in Girders and Similar Structures: With Observations ...
Bindon Blood Stoney
Sin vista previa disponible - 2015
abutment acting amount angle apex applicable arch bars bracing breadth breaking weight bridge calculated cast-iron central centre coefficient component compression consequently consideration constant continuous crushing curve deflection depth diagonal diameter direction distance distributed Ditto elasticity ends equal equation example experiments extreme feet fibres flange forces girder give given greater half Hence horizontal increased iron latter lattice length less load longitudinal lower flange material maximum strains measured method moments nearly neutral axis obtained occur passing passing load permanent pillar plate points practice pressure produced proportion quantity reaction rectangular represent resistance respectively resting resultant rivets round segment semi-girder shearing-strain side similar solid span square inch steel strength sustains taking tensile tension thickness thrust tons transverse triangles tube uniform uniformly unit-strain vary vertical whole wrought-iron
Página 470 - The magnitude of the blow in each set of experiments being made greater or smaller, as occasion required. The general result obtained was, that when the blow was powerful enough to bend the bars through one-half of their ultimate deflection (that is to say, the deflection which corresponds to their fracture by dead pressure), no bar was able to stand 4000 of such blows in succession ; but all the bars (when sound) resisted the effects of 4000 blows, etch bending them through one-third of their ultimate...
Página 250 - A long, uniform, cast-iron pillar, with its ends firmly fixed, whether by means of discs or otherwise, has the same power to resist breaking as a pillar of the same diameter, and half the length, with the ends rounded or turned so that the force would pass through the axis.
Página 249 - The strength of a pillar, with one end rounded and the other flat, is the arithmetical mean between that of a pillar of the same dimensions with both ends round, and one with both ends flat. Thus, of three cylindrical pillars, all of the same length...
Página 306 - In screwed bolts the breaking strain is found to be greater when old dies are used in then- formation than when the dies are new, owing to the iron becoming harder by the greater pressure required in forming the screw thread when the dies are old and blunt than when new and sharp.
Página 249 - Thus, of three cylindrical pillars, all of the same length and diameter, the first having both its ends rounded, the second with one end rounded and one flat, and the third with both ends flat, the strengths are as 1, 2, 3, nearly.
Página 470 - A heavy ball was suspended by a wire eighteen feet long from the roof, so as to touch the centre of the side of the bar. By drawing this ball out of the vertical position at right angles to the length of the bar, in the manner of a pendulum, to any required distance, and suddenly releasing it, it could be made to strike a horizontal blow upon the bar; the magnitude of which could be regulated at pleasure, either by varying the size of the ball or the distance from which it was released.
Página 431 - Ibs. is sufficient to produce fracture if passed over them at the rate of 30 miles an hour. It also appeared that when motion was given to the load, the points of greatest deflection, and, still more, of the greatest strains, did not remain in the centre of the bars, but were removed nearer to the remote extremity of the bar. The bars, when broken by a travelling load, were always fractured at points beyond their centres, and often broken into four or five pieces, thus indicating the great and unusual...
Página 483 - In a wrought-iron or steel bridge the greatest load which can be brought upon it, added to the weight of the super-structure, should not produce a greater strain on any part of the material than five tons, where wrought-iron is used, or six tons and a half, where steel is employed, per square inch.
Página 361 - ... for copper plates. Multiply the constant number by the given diameter in inches, and by the thickness in inches ; the product is the pressure in pounds, which will be required to punch a hole of a given diameter, through a plate of a given thickness. It was observed that, duration of pressure lessened considerably the ultimate force necessary to punch through metal, and that the use of oil on the punch reduced the pressure about eight per cent. A drawing of the experimental lever and apparatus...