Prestressed Bridge Designed for Crane load at Niagara River Weir
A. M. Lount
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Cranes which operate gates of a control weir on the Niagara River cause heavily eccentric live loading on the 1512-ft supporting bridge. Bridge designer selected a homogeneous grid system of longitudinal girders tied together by diaphragms, covered with a 7-in. slab act,ing compositely with the longitudinal girders. All components of the grid are prcstresscd. Design considerations of transverse bending st,iffness and torque rigidity are discussed, and stcp-by-step method for exact structural analysis of the grid is summarized. Construc-tion features are treated briefly with emphasis on shear connectors, stirrup spacing, and prestressing system.