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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: Retrofit of Slab Column Interior Connections
Using Shear Bolts
Author(s): Bamidele Adetifa and Maria Anna Polak
Publication: Structural Journal
Appears on pages(s): 268-274
Keywords: column; concrete; punching shear; shear reinforcement; slab; strength
Abstract:Shear bolts are a new type of reinforcement developed for punching shear strengthening and retrofit of existing slab-column connections. The shear bolt consists of a headed vertical rod threaded at the other end for anchoring using a washer and nut system. The bolts are installed in holes drilled in a slab in concentric perimeters around the column. Previous testing carried out at the University of Waterloo established the feasibility of using shear bolt reinforcement to increase the punching-shear strength and ductility of edge slab column connections. This paper describes an experimental research program in which large-scale models representing interior slab-column connections were tested. Six specimens, 1800 x 1800 x 120 mm, with square columns 150 x 150 mm, were built. Two specimens had openings constructed near the column. These two, and an additional three, specimens were reinforced using the shear bolt system. One slab was without the shear bolts and served as a control specimen. The test results are presented in terms of deflections, strains, and crack width. It was found that the use of shear bolts increased the strength of the connection and significantly improved the ductility.
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