The Theory and Practice of Modern Framed Structures: DesignJ. Wiley, 1910 - Arches |
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Common terms and phrases
allowable arrangement assumed bars beam bearing bending moment bending moments bending stresses bottom chord bridge calculated cent Center Line centre channels chord members clearance column compression members connection cover plates dead load dead-load stress deflection determined diagonal diameter direct stress distance eccentricity elastic limit end post equal extreme fibre factor of safety fibre stress flange angles flange area flange stress floor floor-beam formula given in Art gusset plates horizontal impact in.-lbs inches joint legs live load live-load stress lower chord maximum stress moment of inertia neutral axis number of rivets pin plates pin-plate placed plane plate girder portal purlins radius of gyration rivet pitch rollers secondary stresses shearing stresses shown in Fig single shear span length Specifications steel stiffeners stringer structure Table tension members thickness top chord ultimate strength unit stress vertical web plate weight width
Popular passages
Page 449 - Steel work, before leaving the shop, shall be thoroughly cleaned and given one good coating of pure linseed oil, or such paint as may be called for, well worked into all joints and open spaces.
Page 345 - The pitch of rivets at the ends of built compression members shall not exceed four diameters of the rivets, for a length equal to one and one-half times the maximum width of member.
Page 444 - Material which, subsequent to the above tests at the mills, and its acceptance there, develops weak spots, brittleness, cracks or other imperfections, or is found to have injurious defects, will be rejected at the shop and shall be replaced by the manufacturer at his own cost.
Page 439 - Pins shall be long enough to secure a full bearing of all parts connected upon the turned body of the pin. They shall be secured by chambered nuts or be provided with washers if solid nuts are used. The screw ends shall be long enough to admit of burring the threads.
Page 445 - Except where chilled iron is specified, castings shall be made of tough gray iron, with sulphur not over 0.10 per cent. They shall be true to pattern, out of wind and free from flaws and excessive shrinkage. If tests are demanded, they shall be made on the "Arbitration Bar" of the American Society for Testing Materials, which is a round bar 1% in.
Page 436 - Members subject to alternate stresses of tension and compression shall be proportioned for the stresses giving the largest section. If the alternate stresses occur in succession during the passage of one train, as in stiff counters, each stress shall be increased by 50 per cent. of the smaller.
Page 449 - Painting shall be done only when the surface of the metal is perfectly dry. It shall not be done in wet or freezing weather, unless protected under cover. 155. Machine-finished surfaces shall be coated with white lead and tallow before shipment or before being put out into the open air.
Page 444 - A variation in cross-section or weight of each piece of steel of more than 2^ per cent from that specified will be sufficient cause for rejection, except in case of sheared plates, which will be covered by the following permissible variations, which are to apply to single plates, when ordered to weight: 105.
Page 442 - Chemical determinations of the percentages of carbon, phosphorus, sulphur and manganese shall be made by the manufacturer from a test ingot taken at the time of the pouring of each melt of steel, and a correct copy of such analysis shall be furnished to the engineer or his inspector. Check analyses shall be made from finished material, if called for by the purchaser, in which case an excess of 25 per cent. above the required limits will be allowed.
Page 446 - All parts forming a structure shall be built in accordance with approved drawings. The workmanship and finish shall be equal to the best practice in modern bridge works. Material arriving from the mills shall be protected from the weather and shall have clean surfaces before being worked in the shops.