 | Sir Benjamin Baker - 1873 - 188 páginas
...girders to the cross girders, which are rendered laterally stable by the set of horizontal brat-ing first referred to. The weight of the cross girders...main girders may be taken as an average to vary from 6-7 cvvt. for a 20 ft. span, to 9 cwt. for a 275 ft. span ; but it will be understood that considerable... | |
 | Brysson Cunningham - 1904 - 724 páginas
...above loads may be reduced by 2 cwts. per foot, and where upon four girders, by 4 cwts. per foot.t "The weight of the cross girders and bracing for a...railway bridge, to carry two lines of railway between main girders, may be taken on an average to vary from 6-7 cwts. for a 20-foot span to 9 cwts. for a... | |
 | Brysson Cunningham - 1904 - 652 páginas
...above loads may be reduced by 2 cwts. per foot, and where upon four girders, by 4 cwts. per foot.t "The weight of the cross girders and bracing for a...railway bridge, to carry two lines of railway between main girders, may be taken on an average to vary from 6-7 cwts. for a 20-foot span to 9 cwts. for a... | |
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... for a 20 ft. span, to 9 cwt. for a 275 ft. span ; but it will be understood that considerable modification in these weights, both of a plus and minus nature, may be effected by a variation in the depth or arrangement of the cross girders. 