Engineering and Contracting . ttO-O Toivmr- Omr-t» Fig. 5. Longitudinal Elevation of Top of Tower Span and End of Truss Span-Des Moines River Viaduct. A) are shorter than those for tlic adjacentlicnts as the shoes of the truss spans rest di-rnrtly On the tops of thcsc columns (see 2-in. plate is used under tlic bearings-(?cure a more equal distribution of the loadover the column section. Struts are substi- IKiint at tlic same elevation on tlic other bentof the tower. In this manner tlic thrust fromthe truss span is equally distributed into allof the tower pedestals. The shoes on to
Engineering and Contracting . ttO-O Toivmr- Omr-t» Fig. 5. Longitudinal Elevation of Top of Tower Span and End of Truss Span-Des Moines River Viaduct. A) are shorter than those for tlic adjacentlicnts as the shoes of the truss spans rest di-rnrtly On the tops of thcsc columns (see 2-in. plate is used under tlic bearings-(?cure a more equal distribution of the loadover the column section. Struts are substi- IKiint at tlic same elevation on tlic other bentof the tower. In this manner tlic thrust fromthe truss span is equally distributed into allof the tower pedestals. The shoes on top ofthe river bents are each connected to the col-\imns with cicht bolts. Four of these bolts. of the advantage in having continuous websin both directions. At the base each columnrests on a cast-steel rocker-shoc. the connec-tion l)eing made with a 14-in. diameter load is further distributed by means ofan I-beam grillage. The spaces between theI-beams were tilled with concrete after thegrillages were set and before the superstruc-ture was fully erected. The main section ofthese columns is shown in Fig. Ij, which alsoshows the manner in which the columns werewidened in a longitudinal direction at the topto provide seats for the bed plates of the trussspans. The columns are reinforced with hori-zontal diaphragms spaced about 11 ft. tlanges are braced by the transverse gus-set plates and batten plates and by the single-angle lacing which consists of 3%x3V6.\7 connected to each flange with fourrivets. The gusset and batten plates are pro-vided (as on the tower columns) w;ith holes. The transverse bracing in therocker bent consists of four
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Keywords: ., bookcentury1900, bookdecade1900, bookpublisherchicago, bookyear19
