Title:
Parking Structure Damage
Author(s):
Scott M. Adan and René W. Luft
Publication:
Concrete International
Volume:
31
Issue:
10
Appears on pages(s):
29-32
Keywords:
assessment, external post-tensioning, reseating, anchorage.
DOI:
Date:
10/1/2009
Abstract:
The authors were contracted to evaluate a severely damaged parking garage in Northern California. The structure’s slab exhibited extensive cracking, visible deflections, and a partially collapsed area, indicating a one-time overload. Detailed assessment included the use of ground-penetrating radar surveys to locate reinforcing bars and strands as well as tests of core samples to determine the concrete properties. Repairs included selective replacement of damaged slabs, epoxy injection of cracks, installation of external post-tensioning tendons, and reseating of the existing tendons to a higher tension level. The excessive slab deflections were removed and the structure was restored to service.