The encyclopdia britannica; a dictionary of arts, sciences, literature and general information . ritanniabridge!()hastwo;spansof 46oandtwoof 230 ft. at104 , iigk water. It consists of a pair of tubular girders withsolid or plate sides stiffened by angle irons, one line of railspassirig through each tube. Each girder is 1511 ; andweighs 4680 tons. In cross section (fig. 17), it is 15 ft. wide andvaries, in depth from 23 ft. at the ends to 30 ft. at the centreiPartly to counteract any tendency to buckling under com-pression and partly for convenience in assembling a great ma
The encyclopdia britannica; a dictionary of arts, sciences, literature and general information . ritanniabridge!()hastwo;spansof 46oandtwoof 230 ft. at104 , iigk water. It consists of a pair of tubular girders withsolid or plate sides stiffened by angle irons, one line of railspassirig through each tube. Each girder is 1511 ; andweighs 4680 tons. In cross section (fig. 17), it is 15 ft. wide andvaries, in depth from 23 ft. at the ends to 30 ft. at the centreiPartly to counteract any tendency to buckling under com-pression and partly for convenience in assembling a great massof plates, the top and bottom were made cellular, the cells beingjust large -enough to permit passage for painting. The total Eaton Hodgkinson, y^ho assisted in the .experimental tests andin formulating the imperfect theory then available. The Conwaybridge was first completed, and the first train passed throughthe Britannia bridge in 18 50. Though each girder has beenmade continuous over the four spans itlhaanot quite thfi pro-portions over the piers which a continuous, gurder should Fig. ^Britannia Bridge (Cross Section of Tubular Girder). and must be regarded as an imperfectly continuous girder. Thespans were in fiact designed as independent girders, the advantageof continuity being at that time imperfectly known. The verticalsides of the girdejrs, are ..stiflfened so that they amount to 40 %of the whole weight. This was partly necessary to meet theuncertain conditions in floating when the distribution of support-ing forces was unknown and^there were chances of iron and, later, steel plate web girders were largely
Size: 1163px × 2149px
Photo credit: © The Reading Room / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., bookcentury1900, bookdecade1910, booksubjectencyclo, bookyear1910
