Author Description

This historic book may have numerous typos and missing text. Purchasers can download a free scanned copy of the original book (without typos) from the publisher. Not indexed. Not illustrated. 1889 Excerpt:... vertical strain. The question has been carefully inquired into, and the present report is the result. It will be seen that the Warren compound girder offers most advantages, and therefore this type of girder has been selected. The same girder has also been adopted for the independent spans connecting the consecutive cantilevers. It is proposed to provide the bridge with two lines of way situated at lm?50 apart. The upper level of the rails will be 72 metres above the low-water level, the lowermost portion of the bridge being 61 metres above the low-water level throughout the extent of the spans of 300 metres, while in the centre of the spans of 500 melres, that portion is 66m,50 above the low-water level (see sheets 6, 7, 8 and 9). Central Span and Cantilever Arms.--The metal flooring of the bridge is formed of twro girders resting upon twTo piers 300 metres apart, and lengthened on either side to the extent of 187 metres, the arms of the cantilevers being 500 melres apart. These girders are 11 metres high at Ihe ends of the overhanging portions, and 65 metres high almost throughout the span of 300 metres. Each girder consists of two members or chords connected by bracings forming isosceles triangles. The lower flanges of the two girders have a distance of 25 metres between their axes in the central span of 300 metres, and an interval of 10 metres at the ends. They are (1) The segments and calculations relating to the superstructure for the contemplated Channel bridge vere conducted by M. J. B. Pradel, managing engineer of the Ghantier du Creusot at Ghalon-sur-Saone. horizontal in the central span, hut are raised to a height of 5 metres at the ends of the cantilevers. The upper chords are connected in the largest portion of the central span, hut diverge at...