Effective Width of Insulated Sandwich Panels with Interior Flexible FRP Shear Connectors Considering Partial Degree of Composite Action
Publication: Journal of Engineering Mechanics
Volume 143, Issue 9
Abstract
Insulated sandwich panels consist of two layers of wythe separated by a foam insulation. In recent years, fiber-reinforced polymer (FRP) materials have begun to be incorporated as shear connectors, because they have a lower thermal conductivity than steel and can significantly reduce thermal bridging. Until now, no effective guidelines exist for the design of these panels. Generally, they are treated as rectangular beams, which is not reasonable because the longitudinal stress over the wythe section is nonuniform resulting from the in-plane shear flexibility of the wythe, which is called the shear lag effect. The effective flange width has been used to describe the shear lag effect for a deck-on-girder composite beam system, reducing a three-dimensional behavior of the composite beam system to the analysis of a T-beam section with a reduced width of deck. This paper extends the concept of effective flange width to insulated concrete sandwich panels. A shear lag model is first developed to study the sandwich panel system, in which partial degree of composite action (DCA) owing to a flexible FRP shear connector is considered. The analytical model is then verified through close correlations between finite-element and analytical results for a concrete sandwich panel with FRP shear connectors. Finally, a parametric study was conducted using the analytical model.
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Acknowledgments
The authors thank Dr. Wei Hong from Department of Aerospace Engineering at Iowa State University for his help and fruitful discussions.
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©2017 American Society of Civil Engineers.
History
Received: Aug 13, 2016
Accepted: Mar 16, 2017
Published online: Jul 14, 2017
Published in print: Sep 1, 2017
Discussion open until: Dec 14, 2017
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