Analytical Modeling of the Interface between Lightly Roughened Hollowcore Slabs and Cast-In-Place Concrete Topping
Publication: Journal of Structural Engineering
Volume 141, Issue 4
Abstract
Hollowcore slabs are commonly used in different types of structures. They usually include a 50-mm concrete topping. Structural engineers can use this topping to increase the slab load-carrying capacity. North American design standards relate the horizontal shear strength at the interface between hollowcore slabs and the concrete topping to the slab surface roughness. This paper presents the results of four push-off tests on hollowcore slabs supplied by two manufacturers and roughened using a conventional steel broom. The tested slabs sustained higher horizontal shear stresses than those specified by the design standards. Utilizing the data from the push-off tests, an analytical model was applied to evaluate the shear and peel stiffnesses, and , of the interface between hollowcore slabs and concrete topping. Structural engineers can utilize and values to model the composite action between hollowcore slabs from the two manufacturers and concrete topping. The analytical model was also used to evaluate the actual distribution of shear and peel stresses.
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Acknowledgments
The authors acknowledge the enthusiastic guidance and technical advice provided by Mr. Anil Mehta from the Prestressed Systems Inc. (PSI), Windsor, ON, and the financial support provided by the Canadian Precast/Prestressed Institute (CPCI), the Ontario Centers of Excellence (OCE), and PSI.
References
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Information & Authors
Information
Published In
Journal of Structural Engineering
Volume 141 • Issue 4 • April 2015
Copyright
© 2014 American Society of Civil Engineers.
History
Received: Aug 5, 2013
Accepted: Mar 6, 2014
Published online: Jul 9, 2014
Discussion open until: Dec 9, 2014
Published in print: Apr 1, 2015
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