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The Theory and Practice of Bridge Construction, in Timber, Iron and Steel
Morgan William Davies
No preview available - 2015
bascule bridge bending moments bottom chords braced cables cantilever carried cast iron centre to centre compression members concentrated load condition of loading cross girder curve cwts dead load deflection depth diagonal diagram diameter dimensions distance equal Extrados factor of safety flange floor foot run formula fully loaded horizontal component horizontal stress horizontal thrust illustrated joint live load extends longitudinal main girders masonry maxima maximum compression maximum stress maximum tension ordinate panel load panel point parabolic parallel pier pitch pine plate plate girder bridge point of support radius of gyration represent required to determine resistance right abutment rivet holes rivets rollers sectional area shearing forces shearing stress shown in Fig spandril square inch steel strain stresses due structure suspended swing bridge tensile tensile stress thickness timber tons per square top and bottom uniformly distributed load vertical component vertical re-actions
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 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.