CAMELBACK THROUGH TRUSS
1906 Pottawatomie 63D3342E1446000 American Br.
The state's sole example of the camelback through span exists in a mixed truss bridge, a design that modified the Parker by utilizing a polygonal top chord of precisely five angles, also originated as a railroad bridge. Built for the Santa Fe in 1906 by the American Bridge Company of Ambridge, Pennsylvania, to carry the single track across the South Canadian for the line to Pauls Valley, it has the heavy weight members required for the great strains of railway service (Figure 63). A pinned bridge of this sort will result in greater wear around the cylindrical pins caused by rotation. For long railroad bridges, however, engineers sometimes desired the "give" that pins provided for they reduced secondary stresses.
Figure 63. The strength, height, and narrowness of Bridge 63D3342E1446000, a three span camelback through truss, show its origins as a railroad structure. Pin-connected and measuring 785 feet, it stands over the South Canadian River near Wanette.