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adjustable rods assumed bearing bending bending moment bolts bottom chords bracing broken top cantilever bridges cent central planes centre line channels columns compression compressive stress connected Contractor cover-plates cross-girders curves dead load deck-bridges depth DETAILS OF DESIGN diagonals drum elastic limit elevated railroads end of span Engineer equivalent exceed eye-bars feet fifteen 15 floor floor-beams greatest Highway Bridges horizontal hundred inches in diameter inclined end posts inclined posts joists lacing-bars less line of lacing lineal foot live load longitudinal girders lower lateral systems main diagonals metal open-webbed panel points pinhole plate girders plate-girder spans pounds per square Pratt trusses rail Railroad Draw-Spans Railroad Structures rigid riveted girders rollers shear soft steel span length Specifications for Railroad splices square inch stiffened strength stresses stringers superelevation test-pieces thickness top chords top flanges tower transverse trestles upper lateral system vertical posts viaducts webs wind load wind-pressure wrought iron
Page 107 - Material which is to be used without annealing or further treatment is to be tested in the condition in which it comes from the rolls. When material is to be annealed or otherwise treated before use, the specimen representing such material is to be similarly treated before- testing.
Page 29 - The flanges of plate girders shall be connected to the web with a sufficient number of rivets to transfer the total shear at any point in a distance equal to the effective depth of the girder at that point combined with any load that is applied directly on the flange. The wheel loads where the ties rest on the flanges shall be assumed to be distributed over three ties.
Page 106 - Rivets and lacing steel, and small pieces for pin plates and stiffeners, may be shipped in bundles, securely wired together, with the melt number on a metal tag attached.
Page 27 - Where field splices are unavoidable they must be so located that no two pieces of either the flange or the web shall be spliced within two (2) feet of each other and so that no field-splice shall occur at any point where there is not an excess of sectional area above the theoretical requirements.
Page 121 - In shipping long plate girders great care is to be taken to distribute the weight properly over the two cars that support them, and to provide means for permitting the cars to pass around curves without disturbing the loading. In both the handling and...
Page 116 - Inspection of work shall be made as it progresses, and at as early a period as the nature of the work permits. (2) All workmanship must be first-class. All abutting surfaces of compression members, except flanges of plate girders where the joints are fully spliced, must be planed or turned to even bearings, so that they shall be in such contact throughout as may be obtained by such means.
Page 111 - Pins exceeding 7 inches diameter shall be forged under a steel hammer striking a blow of at least 5 tons. The blooms to be used for this purpose shall have at least three times the sectional area of the finished pins. 102. Variation in Weight. — A variation in cross-section or weight of rolled material of more than 2\ per cent, from that specified may be cause for rejection.
Page 112 - Except where chilled iron is specified, all castings shall be of tough, gray iron, free from injurious cold shuts or blow holes, true to pattern, and of workmanlike finish.
Page 117 - No web-plate will be allowed to project beyond the flange angles, or to recede more than one eighth (J) of an inch from faces of same. All filling and splice plates in riveted work must fit at their ends to the flanges sufficiently close to be sealed, when painted, against the admission of water ; but they need not be tool-finished, unless so specially indicated either on the drawings or in the specifications.