Wacker Drive Reconstruction - Phase 2 Design Case Study Demolition of an aging beyond-life viaduct Replacement with biaxially post-tensioned, high performance concrete slab structure Vehicle load optimisation for an irregularly supported deck Wacker Drive is a major two-level viaduct bordering the north and west sides of Chicago’s downtown ‘Loop’ . Owing to severe corrosion of the reinforcing steel and spalling of the concrete cover, the Chicago Departmentof Transportation decided to replace the aging viaduct with a biaxially post- tensioned, high performance concrete slab structure. Phase 1 of the reconstruction work (as shown above) was completed in 2002. LUSAS Bridge analysis software was used by Alfred Benesch & Company for the design of an 1800 foot (550 metre) length of the second re

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