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2 East 8th Street Parking Garage

Chicago, IL • Strengthening

East 8th Street apartments, designed by Seymour S. Goldstein, is a 27 story skyscraper, constructed in 1984.  In 2004-2005, the structure underwent $6 million in renovations, producing new exteriors, new interiors, and new retail along State Street.  Building amenities include an indoor heated pool, fitness center, clubhouse, and panoramic views.

KEC was assigned to develop a repair/strengthening solution for the numerous and significant cracks found on fourth floor slab of the parking garage.  KEC developed a unique “hybrid” external post-tensioning system to strengthen and lift the sagging slab.  In the banded tendon direction, new 8-inch continuous concrete drops were added to encase the additional post-tensioned cables.  In the uniform tendon direction, external tendons were encased within 3-inch wide plastic ducts, which were subsequently grouted.  The “hybrid” external post-tensioning system saved the owner millions of dollars compared to the alternative solution, which was to demo and rebuild the garage.