Long-span Railway Bridges; Comprising Investigations Of The Compararive Theoretical And Practical…

Paperback | October 12, 2012

byBenjamin Baker

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This historic book may have numerous typos and missing text. Purchasers can usually download a free scanned copy of the original book (without typos) from the publisher. Not indexed. Not illustrated. 1873 edition. Excerpt: ...to that of a dead load of equal intensity, the general form of bridge suitable to carry a mixed load when the rolling element is of insignificant proportion may be essentially different from the design suitable for a bridge when those conditions are reversed. Again, a bridge may be defined as of long or short span relative to the average length of train traversing it; because a train does not constitute a rolling load of uniform weight per lineal foot, and the variation in its density will be of little importance in the instance of long spans, but of vital influence in the case of short-span bridges. Thus, a passenger-train may be made up of a string of vehicles weighing less than half a ton per foot run, whilst for the 50 ft. length at the head of the train, occupied by the engine and tender, the weight may average 1£ ton per foot, or two and a half times as much as the remainder of the train; and in the very common case of the employment of two engines and tenders the heavier load will apply of course to a length of 100 ft. of the train. In the same way a goods train may consist of a long line of trucks weighing less than f ton per lineal foot, whilst the tank engine at its head may average double that amount, or 1J ton per foot. Hence, as the wheel base of a tank engine is not unfrequently as little as one-half of the total length of engine, it is obvious at once that in short-span bridges we shall have to entertain rolling loads at least as high as 3 tons per lineal foot, although in the case of long-span bridges subject to be traversed by the same trains the average weight of the train, or little more than of the preceding amount, need be considered in the calculations. It will, we think, be granted at once, that bridges which...

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This historic book may have numerous typos and missing text. Purchasers can usually download a free scanned copy of the original book (without typos) from the publisher. Not indexed. Not illustrated. 1873 edition. Excerpt: ...to that of a dead load of equal intensity, the general form of bridge suitable to carry a mixed load when the r...

Format:PaperbackDimensions:38 pages, 9.69 × 7.44 × 0.08 inPublished:October 12, 2012Publisher:General Books LLCLanguage:English

The following ISBNs are associated with this title:

ISBN - 10:0217847269

ISBN - 13:9780217847261

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