The Designing of Ordinary Iron Highway Bridges

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Wiley, 1884 - Bridges - 252 pages
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Page 168 - America, for the payment of which well and truly to be made, we bind ourselves, our heirs, executors and administrators, jointly and severally, firmly by these presents.
Page 169 - ... which is a powerful incentive to honest, conscientious work, and if every State passed a law covering the above suggestion, there would in a short time be a surprising improvement in the design and construction of highway bridges, although that improvement would be accompanied with an increased cost. It will be noticed, in the last clause of the form for " Invitation," bidders are requested to be present at the opening of the bids, and hearing them read.
Page 26 - AH wrought-iron must be tough, fibrous, and uniform in character. It shall have a limit of elasticity of not less than 26,000 pounds per square inch. Finished bars must be thoroughly welded during the rolling, and free from injurious seams, blisters, buckles, cinder spots, or imperfect edge?. 2. For all tension members, the muck bars shall be rolled into flats, and again cut, piled, and rolled into finished sizes. They shall stand the following tests: — Tension 3.
Page 238 - The Arm of a couple is the perpendicular distance between the lines of action of the two forces...
Page 25 - After the structure is erected, the iron work shall be thoroughly and evenly painted with two additional coats of paint, mixed with pure linseed oil, of such color as may be selected. 110. Pins, pin holes, screw threads, and other finished surfaces shall be coated with white lead and tallow before being shipped from the shop.
Page 25 - Bars which are to be placed side by side in the structure shall be bored at the same temperature and of such equal length that upon being piled on each other the pins shall pass through the holes at both ends without driving.
Page 18 - The several pieces forming one built member must fit closely together, and when riveted shall be free from twists, bends, or open joints.
Page 238 - LATERAL SYSTEM. A system of tension and compression members, forming the web of a horizontal truss, connecting the opposite chords of a span. Its purposes are to transmit wind pressure to the piers or abutments, to prevent undue vibration from passing trains or other loads, and to hold the chord members to place and line. LATTICE.

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