Bridge Analysis, Design and Repair
333019 - Construction of the Lewis and Clark Cable-Stayed Bridge over the Ohio River
Friday, April 20
3:30 PM - 5:00 PM
Constructed under a $763 million public private partnership contract (P3) the Lewis and Clark Bridge features a 2,280-ft long three-span symmetrical steel composite cable-stayed bridge with a center span of 1,200 feet and side spans of 540 feet each.
The towers supporting the bridge feature convex curved diamond configuration and are supported on waterline footings founded on 8-ft diameter drilled shafts socketed into competent limestone. The superstructure features a streamlined steel composite deck consisting of inclined longitudinal steel I-shaped edge girders at each end and transverse floor beams made composite with the precast concrete deck. A minimum 2”thick concrete overlay is placed atop the precast panels to provide for greater durability of the bridge deck.
The cable-stayed bridge has a total of 104 parallel strand stay-cables, spaced at 45’-0” intervals at the edge girder anchorage, and arranged in a modified fan arrangement. The stay-cables are connected to the edge girders using in-line shark-fin anchorages welded directly to edge girder web to provide for direct load path of the cable forces into the girder. At the tower head anchorage, the cables are anchored into steel anchor boxes.
To fast-track construction, the cable-stayed bridge was constructed using a combination of several construction methods. The Indiana back span was incrementally launched while the Kentucky side span was stick-build on falsework, allowing for simultaneous construction of the superstructure steel grillage of the two back spans while the diamond towers were being constructed. Upon completion of the towers, the center span was constructed by balanced cantilever.
The bridge opened to traffic on December 18, 2016. The project owner is the Indiana Finance Authority. The P3 contract, covering the financing, design, construction, operation and maintenance of the bridge for 35 years, was awarded to a consortium consisting of Walsh Investors, Bilfinger Project Investments and Vinci Concessions with Walsh Construction Co. and Vinci as contractors, and Jacobs as the Lead Design Engineer
The presentation will discuss the methods of construction for the substructure, towers, and the superstructure of the cable-stayed bridge.