Out-of-Plane Behavior of URM Arching Walls with Modern Blast Retrofits: Experimental Results and Analytical Model
Publication: Journal of Structural Engineering
Volume 134, Issue 10
Abstract
A series of framed unreinforced masonry (URM) infill walls were retrofitted with modern materials to evaluate the abilities of these materials to mitigate blast effects. The walls were constructed from traditional and alternative masonry materials to assess the applicability of using a wood-fiber fly ash material for infill construction. The walls were tested in the laboratory under static conditions and were evaluated using several criteria: energy absorption, out-of-plane load resistance, out-of-plane deformability, and the reduction of masonry debris scatter upon collapse. Due to the presence of the surrounding frame structure, all of the walls in this program experienced some form of an arching mechanism. The use of a spray-on polyurea material was found to be highly effective in improving URM energy absorption and reducing masonry fragmentation. Infill walls retrofitted with a combination of fiber-reinforced polymer (FRP) grids and polyurea material were found to fail prematurely due to a lack of anchorage between the strengthened walls and surrounding structure. A simplified analytical model to estimate the ultimate out-of-plane capacity for FRP strengthened URM arching walls was developed. The analytical model was empirically calibrated using test data from this work as well as previous studies. The model predictions agree well with the experimental results reported in this paper.
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Acknowledgments
The writers would like to acknowledge Encore Building Solutions, Inc. of St. Louis, the National Science Foundation’s (NSF) University Cooperative Research Center, the Repair of Building and Bridges with Composites for providing funding for this research. Additionally, the writer would like to thank BASF Building Systems, TechFab LLC., and International Paper for their donations of materials.
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Information & Authors
Information
Published In
Journal of Structural Engineering
Volume 134 • Issue 10 • October 2008
Pages: 1589 - 1597
Copyright
© 2008 ASCE.
History
Received: Jun 19, 2007
Accepted: Feb 29, 2008
Published online: Oct 1, 2008
Published in print: Oct 2008
Notes
Note. Associate Editor: Rajesh Prasad Dhakal
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