Engineering and Contracting . her arches being similar. The Comment on Mr. J. E. Greiners Paper, Rolling Loads on Bridges. To THE FiiiTORs:—.\ modern trend in thematter of railroad bridge designing is shownin a recent bulletin of the American RailwayEngineering Association, namely, Vol. 15, In a discussion on Rolling Loads onBridges, Mr. J. R. Greiner makes some rec-ommendations which, if taken seriously, wouldtotally demoralize railroad bridge on opinion solely, for no data nor testswhatever are quoted, Mr. Greiner makes thestatement that railroad bridges can, with per-f
Engineering and Contracting . her arches being similar. The Comment on Mr. J. E. Greiners Paper, Rolling Loads on Bridges. To THE FiiiTORs:—.\ modern trend in thematter of railroad bridge designing is shownin a recent bulletin of the American RailwayEngineering Association, namely, Vol. 15, In a discussion on Rolling Loads onBridges, Mr. J. R. Greiner makes some rec-ommendations which, if taken seriously, wouldtotally demoralize railroad bridge on opinion solely, for no data nor testswhatever are quoted, Mr. Greiner makes thestatement that railroad bridges can, with per-fect safetly, be overloaded all the way from 50to 100 per cent. And other engineers agreewith him, on the same basis. It is a goodthing that there are rules and laws which re-quire that stability be grounded on something Zrown rinished Roadvvaud43S ^- ^-L j-ift6°,< • Grade 0 63% _ g:(j- -_ Present^e-O-fer Ground a-3 DrilledAGrouteaPier No. 11 a-Va-tiv !VaStirrups4cts Je-Wtwdonelsdlgj. trori^ ^THoopqrie-O-cts. 4-WrivOorsj top i borrom [- EliC (e) SecTion C-C and Footing Plan Cf) Section D-D, Fig. 3. Elevation and Sections of the Arch Rib and Piers of the Longest Arch Span of Williams Bridge. T,\Hi,h; 1. —:i) , init im:i<i:.s mi, .) hih kou ioach iTi:.M (;K \\\.Ms Bnii;i;. rnit Total Item and Quantity. lild. excavation and backfill, cu. yds » $3,450 Wet excavation and backllll. 700 cu. ydn --BO 1,750 Rock excavation and buektill. 00 cu. vdK • iViHS A concrete. 100 cu. ydM H concrete, cu. yds < ladM (? concrete. :;.000 cu. ydH 21. conireli-. 750 c\i. yiln 17,250 foncrete rallliiK. 2,5:iO lln. ft 10,120 RelnforclOK Mieel. Urn 0 i) Curb anil llnlnh anKleM, Kniliaiikni. nt. ;;.son cu. yds Hrick pavliii,-. m|. ydH ].Anip piStH. cnniplete. 15 300 8cupperH iifi
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