The parking structure attached to the Park Michigan Apartments building is located at 1212 south Michigan Avenue, Chicago, Illinois. The building consists of a thirty-story residential tower with a four-story parking garage to the west and a two-story commercial space to the northwest of the tower. The parking structure consists of a ground level and two supported levels of post-tensioned concrete slab. The parking deck has a rectangular shape and measures approximately 200 feet in the north-south direction and 100 feet in the east-west direction. The framing system consists of a two-way, 10-inch-thick flat slab with columns spaced at 30′ in the north-south direction and 27’ in the east-west direction. The open-air scheme was designed with reinforced concrete frames.

ZS performed a Due Diligence inspection that revealed significant spalling and distress at the reinforced concrete columns and beams due to corrosion of the embedded steel elements. ZS was also retained to perform a condition assessment report and design the required repairs.

This project’s scope included:

• A thorough survey of the building’s parking structure condition, including a hands-on examination of all structural components
• Prepared remedial repair recommendations