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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: Long-time Multipliers for Estimating Two-Way Slab Deflections
Author(s): Cameron J. Graham and Andrew Scanlon
Publication: Journal Proceedings
Appears on pages(s): 899-908
Keywords: concrete slabs; cracking (fracturing); creep properties; deflection; flexural strength; loads (forces); multistory buildings; reinforced concrete; shrinkage; two-way slabs; Structural Research
Abstract:A simplified procedure is presented for estimating deflections of two-way slab systems subjected to construction loads, shrinkage restraint cracking, irrecoverable creep, and other significant factors. The simplified procedure is based on long-time multipliers developed from a parameter study using an analytical model that can treat construction loading history as a series of load increments applied at specified times associated with particular construction sequence being used. The proposed calculation procedure results in higher calculated deflections than obtained by the current ACI and CSA design codes, as a result of the use of a reduced effective modulus of rupture and increased long-time multiplier. Calculated deflections are compared with field-measured deflections reported in the literature.
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