Chicago : Engineering and Contracting Pub. Co. · leaf 582
weight of the structure to a mini-mum consistent with stability. It was decided,therefore, to build the bridge with hollowspandrels and hollow piers above the spring-ing lines, and to build the arches in ribs, carrving the roadway on a concrete slab sup-ported by concrete columns resting on thehack… … The slcnderncss ratio of the inner arch ribsof the large arch unbraced was 1:4G, and thatof the smaller arch 1:40. This columnar ra-tio was further reduced, so as to be negligible,by the solid arch sheeting, which was intro-duced in the design for this purpose as wellus for appearance. As this…
Buildings
Internet Archive · University of Illinois Urbana-Champaign · Public Domain Mark 1.0. Free to use for anything.
