Pitt River Bridge
The Pitt River Bridge features a three-span cable-stayed design with a 623 foot main span.
The bridge designers chose to use LARSA 4D largely due to its ability to accomplish the multiple analytical tasks that would be needed for design. This would include live load influence line generation with multiple lane combinations for optimal load cases, seismic analyses using both response spectra analysis and non-linear time-history, loss-of-stay condition with accumulation of different static states, and staged construction of the bridge deck in balanced cantilever with multiple stress states in the cables. Some localized finite element studies were also required, utilizing the program’s shell elements.