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apex applied axis Beam of Uniform bottom chord braces bridge weight camber central height centre chord strain compression compression members computed contrary flexure cross-section dead load deflection due diameter due live load end moments equal weights equation Example factor of safety feet fixed end flanges floor beams foot-tons forces foremost end formula free end girder diagonals given greatest head struts height of girder horizontal diagonals horizontal struts Inclined iron joists left end Method of Moments moment of inertia number of panels panel length panel points panel weight pillar plane plates point of contrary putting radius of gyration ratio resist right end semi-beam semi-girder shearing-strain span square inches strains due Take tension tons transverse I-beams Truss uniform continuous uniform live load uniform strength unit strain values vertical Weight of bridge wind pressure wrought-iron
Page 421 - Bars which are to be placed side by side in the structure shall be bored at the same temperature, and shall be of such equal length that, upon being piled on each other, the pins shall pass through the holes at both ends at the same time without driving.
Page 418 - All joints in riveted work, whether in tension or compression members, must be fully spliced. The sections of compression chords shall be connected at the abutting ends by splices sufficient to hold them truly in position.
Page 414 - To provide for wind strains and vibrations, the top lateral bracing in deck bridges, and the bottom lateral bracing in through bridges, shall be proportioned to resist a lateral force of 450 pounds for each foot of span ; 300 pounds of this to be treated as a moving load.
Page 421 - If it does not stand the specified tests, it will be considered rejected material, and be solely at the cost of the contractor, unless he is not responsible for the design of the work.
Page 421 - At least one sample in three must bend 180 degrees to this curve without cracking. When nicked on one side, and bent by a blow from a sledge, the fracture must be nearly all fibrous, showing but few crystalline specks. 109. Specimens from angle, plate...
Page 417 - The distance between the edge of any piece and the centre of a rivet-hole must never be less than...
Page 417 - Plate girders shall be proportioned upon the supposition that the bending or chord strains are resisted entirely by the upper and lower flanges, and that the shearing or web strains are resisted entirely by the web plate; no part of the web plate shall be estimated as flange area.
Page 417 - No wrought-iron or steel shall be used less than f inch thick, except in places where both sides are always accessible for cleaning and painting. DETAILS OF CONSTRUCTION. 1. All the connections and details of the several parts shall be of such strength that, upon testing, rupture shall occur in the body of the members rather than in any of their details or connections. 2.
Page 414 - ... shall be taken to proportion all the parts of the structure. wind Bracing. 24. To provide for wind strains and vibrations from high-speed trains, the top lateral bracing in deck bridges, and the bottom lateral bracing in through bridges, shall be proportioned to resist a lateral force of...