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Founded in 1904 and headquartered in Farmington Hills, Michigan, USA, the American Concrete Institute is a leading authority and resource worldwide for the development, dissemination, and adoption of its consensus-based standards, technical resources, educational programs, and proven expertise for individuals and organizations involved in concrete design, construction, and materials, who share a commitment to pursuing the best use of concrete.
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Home > Publications > International Concrete Abstracts Portal
The International Concrete Abstracts Portal is an ACI led collaboration with leading technical organizations from within the international concrete industry and offers the most comprehensive collection of published concrete abstracts.
Title: Evaluation, Repair and Reinforcement of an Ultra-Thin, Two-Way Flat Slab With Drop panels
Author(s): Steven G. Provenghi and Gregg E. Brandow
Publication: Special Publication
Appears on pages(s): 1277-1292
Keywords: concrete panels; cracking (fracturing); flat concrete slabs; inspection; nondestructive testing; parking structures; post-tensioning; plastics, polymers and resins; reinforced concrete; repairs; strengthening; structural design; trusses; Design
Abstract:This is an actual case-study of a four-story reinforced concrete parking structure with ultra-thin, two-way flat slabs with drop panels. The slabs were 4.50 in. thick on bays as large as 27 x 27 ft with midspan deflections as much as 5.50 in. The evaluation included physical inspections to evaluate crack patterns as well as nondestructive tests to locate reinforcing steel and full-scale load tests per ACI recommendations to evaluate the strength of the structural slab. Recommendations for repair and strengthening were accomplished by a combination of external post-tensioning with king-post type trussing below the floor slabs and with a gravity-fed polymer repair of the structural cracks found within the slab.
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