Long-Span Railway Bridges
Format: Paperback
ISBN13: 9780217860512
Paperback|9780217860512
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Purchase of this book includes free trial access to www.million-books.com where you can read more than a million books for free. This is an OCR edition with typos. Excerpt from book: Strain in cwts. Economic Span. per sq. in. depth. 300 27 ' 400 37-2 500 48 d = ]. 600 59-4 700 71-4 800 84, L span. Since the weight of the girder itself and of its load is similarly distributed, the amount of the former weight will be the multiple of the latter. The J. t results for the several spans are given below: Span. Multiple. 300 L = -51 400 4j. = -87 500 4 = 1-5 600 ]f = 2-83 700 -44 = 8-3 800 = oo Type 3.?Bowstring Girders. The bowstring girder consists of an arched rib to carry the load, and a tie, instead of the usual abutments, to resist the thrust of the arch, and prevent the tendency to spread at the feet. If the line passing through the centre of gravity of all the cross sections of the arched rib corresponds in position with the curve of equilibrium due to the distribution of the load, the only connection necessary between the arch and the tie will be such vertical ties as may be required to transmit the weight of the tie and its insistent load to the archedrib. But, as the condition of stability of the arched rib requires that the curve of equilibrium of the load, as transmitted to it, should correspond in form with the arch itself, it follows that, if the distribution of the load on the platform] of the bridge be different to that required, the mere insertion of vertical ties capable of transmitting the load in direct lines only will not be sufficient. It will obviously be necessary to supply diagonal members capable of transmitting the load to the points in the arch where it is required to effect compliance with the conditions of equilibrium. It appears, therefore, that, as the ordinary segmental arched rib of a bowstring bridge corresponds in form very nearly with the parabolic curve of equi...
| ISBN-13 | 9780217860512 |
|---|---|
| ISBN-10 | 0217860516 |
| Weight | 0.49 Pounds |
| Dimensions | 9.00 x 6.00 x 0.34 In |
| List Price | $19.99 |
| Format | Paperback |
|---|---|
| Pages | 144 pages |
| Publisher | |
| Published On | 2009-08-01 |
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