The theory and practice of bridge construction, in timber, iron and steel

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Macmillan and co., limited, 1908 - Bridges - 594 pages
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Page 266 - ... above base of rail, moving across the bridge. Second. — At 50 pounds per square foot on the exposed surface of all trusses and the floor system. The greatest result shall be assumed in proportioning the parts.
Page 539 - For compression members these permissible strains of 15,000 and 17,000 pounds per square inch, shall be reduced in proportion to the ratio of the length to the least radius of gyration of the section by the following formula...
Page 218 - Vi in. (12.7 mm) in thickness, or those in which the distance from the edge of the hole to the edge of the angle is less than % in.
Page 187 - ... accompanying table, showing the average safe allowable working unit stresses for the principal bridge and trestle timbers, prepared to meet the average conditions existing in railroad timber structures, the units being based upon the ultimate breaking unit stresses recommended by your committee and the following factors of safety, viz.: Tension with and across grain 10 Compression with grain 5 Compression across grain 4 Transverse rupture, extreme fiber stress 6 Transverse rupture, modulus of...
Page 227 - The lower chord shall be packed as narrow as possible. The pins shall be turned straight and smooth, and shall fit the pin-holes within...
Page 197 - ... remarks made at p. 250 with regard to the tests for wrought iron, and the fractured surface, apply also to steel, except that in the case of steel the forge tests are much more important than for iron. A recent specification for a large steel bridge requires that the bars and plates must have a tensile strength of not less than 28 tons or more than 31 tons per square inch, an elongation of not less than 20 per cent and a limit of elasticity of 1 5 tons.
Page 267 - The wind pressure shall be assumed acting in either direction horizontally: First. At 30 pounds per square foot on the exposed surface of all trusses and the floor as seen in elevation, in addition to a train of 10 feet average height, beginning 2 feet 6 inches above base of rail, moving across the bridge.
Page 187 - ... recommended average values. The class of timber to be used and its condition and quality. Finally the particular kind of strain the stick is to be subjected to, and its position in the structure with regard to its importance and the possible damage that might be caused by its failure.
Page 195 - Fab.., must stand bending in a press to a curve of which the inner radius is one and a half times the thickness of the steel tested.
Page 476 - STRENGTH 1 =^ Unsupported length of sheet in inches. t = Thickness of sheet in inches. b = Width of sheet in inches. d = Depth of corrugations in inches. W = Breaking weight distributed in tons, w = Breaking weight distributed in pounds.

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