. Design of a three span double track reinforced concrete railroad arch bridge . ■jt- i* ■? ^ f <f. Dean of Culture Studies. >* The bridge, as designed, is a rjroposed structurb for theC. V. IT. W. R. R. across the ITorth Branch of the Chicago River,about four miles above the head of navigation. At the presenttime a v/ooden pile trestle carries the railroad across a rataershalloif; wooded valley. This vallej- of the i;.pper waters of theITorth Branch has been under consideration, by various improvenentassociations, as a desirable link in an Outer Park System for thecity of Ciiicago. V/it
. Design of a three span double track reinforced concrete railroad arch bridge . ■jt- i* ■? ^ f <f. Dean of Culture Studies. >* The bridge, as designed, is a rjroposed structurb for theC. V. IT. W. R. R. across the ITorth Branch of the Chicago River,about four miles above the head of navigation. At the presenttime a v/ooden pile trestle carries the railroad across a rataershalloif; wooded valley. This vallej- of the i;.pper waters of theITorth Branch has been under consideration, by various improvenentassociations, as a desirable link in an Outer Park System for thecity of Ciiicago. V/ith ohis fact in nind, the bridge was providedwith two forty foot arches to acconnriodate future OF DESIGiJ. The method of design used in the aiv^lyses of the arches,was the graphical system developed by Ivlr. Burton R. Leffler,Bridge Engineer for the L. S. oc M. S. R. R., in his treatise onThe Elastic Arch. In indicating the method of design, the cal-culations for one of the forty foot arches will be FORTY FOOT ARCH. Two assumptions must be nade to start with, (l) thedesignofthreespa00mill
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