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Wiss, Janney, Elstner Associates, Inc. , Northbrook , United States
Group Author: James P. Donnelly , Dunja Vla, Timothy A. Gregor, Kenneth P. Marley, Tracy R. Naso
The primary parking structure serving O’Hare International Airport was opened for use in 1973 with 10,000 parking spaces and over 240,000 square meters of supported slabs. The six-story concrete structure was primarily reinforced using button-head post-tensioning. A condition assessment was performed in January of 2018 and identified structural deterioration which included freeze-thaw deterioration of concrete, corrosion-related delamination and spalling, and localized eruption of failed button-head tendons. Waterproofing deterioration consisted primarily of wear of waterproofing membranes and damage and wear of expansion joint seals. The resulting multi-year restoration program to extend the service life of the parking structure began in September 2020 and was completed in September 2022. Concrete and post-tensioning repairs to the slab, beams, girders, and columns were performed throughout. Sealant and expansion joint seal replacement were also performed to address leaks. Additionally, a unique structural strengthening repair was implemented at one of the columns that supports a signature helical ramp.
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