Haight Davis & Associates Inc. was hired by a Condominium Association in downtown Atlanta to evaluate a failing steel-framed concrete parking deck. The 10-story parking deck began cracking almost immediately after construction was completed in 1999. In 2003, the City of Atlanta was about to condemn the deck because the deterioration of the concrete was so severe that it created safety concerns. The Condo Association, however, wanted the parking deck repaired, but did not have the necessary funds to replace it. HD&A was hired to design a “temporary repair” to provide the necessary structural support and protect both people and property.
The hazards included severe deterioration of the concrete decking, the deterioration of the steel support members, as well as excessive vibration and deflection. The concrete cracking was so severe that many areas were blocked off (Photo 1). With time, the deterioration worsened and concrete began to punch through the steel deck pan supporting the slab (Photo 2). Water then seeped through the cracks, causing deterioration of the steel support members and the reinforcing steel (Photos 3 & 4). This deterioration weakened the steel members allowing for increased vibrations and deflection of the drive lane.