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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: Comparison of Preshore and Reshore Procedures for Flat Slabs
Author(s): N. J. Gardner and Chi-Seng Chan
Publication: Special Publication
Appears on pages(s): 157-174
Keywords: concrete construction; deflection; flat concrete slabs; shoring; formwork (construction); loads (forces); multistory buildings; reinforced concrete; structural analysis; General
Abstract:Multistory reinforced concrete structures are generally constructed using one level of shores and multiple levels of reshores. The stripping schedule is to completely strip a bay of shores before reshoring. Reshoring results in high-early-age construction loads being applied to the immature slab structures. Preshoring, or scheduled reshoring, is an attempt to reduce the adverse effects of clear bay reshoring by reducing the area stripped before reshoring. The load-strength ratio in preshored construction is little different to reshored construction but the loads are applied later which will reduce creep deflection effects. Using 2D and 3D models the slab, shore, and reshore loads were calculated for preshored construction. The advantage of preshoring is that the unsupported span lengths are reduced thus reducing slab deflections. The disadvantage of preshoring is that to realize the benefits close control of the construction process is needed.
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