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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: Control of Deflection in Concrete Slabs and Effects of Construction Loads
Author(s): Pericles C. Stivaros
Publication: Special Publication
Appears on pages(s): 1-22
Keywords: Concrete slabs, construction failures, cracking, deflection control, long term deflection, serviceability, shoring/reshoring, two-way slabs.
Abstract:This paper is concerned with the effects of high construction loads on long term deflections, and evaluates the ACI 318 deflection control requirements. Practical applications involving two building construction cases are presented. In these cases, the concrete slabs developed extensive cracking and excessive deflections soon after the slab construction and formwork removal. Additional deflections were developed following the installation of interior partitions. The paper also investigates the effects of the shoring/reshoring operations and the construction load history, as well as the effects of improper deflection control design procedures on the slab deflections. The ACI 318 slab deflection control requirements, along with other published proposed methods on deflection control are applied and compared. The conclusions of this study indicate that the ACI’s minimum slab thickness requirements for deflection control are not sufficient since they do not account for the creep and shrinkage effects, as well as the effects of early-age high construction loads, and the resulting initial cracking of the concrete members.
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