Modeling the Nonlinear Behavior of Concrete Masonry Walls Retrofitted with Steel Studs under Blast Loading
Publication: Journal of Performance of Constructed Facilities
Volume 25, Issue 5
Abstract
This paper presents the results of an analytical investigation of one-way unreinforced masonry (URM) walls retrofitted with externally anchored steel studs and subjected to blast loads. Using the wall geometrical and material properties, deflected shape, and crack pattern as input, a nonlinear model is developed to predict the inward force-displacement relationship of the retrofitted walls. In addition, using a rigid body analysis, a simple bilinear force-displacement relationship is developed to model the outward force-displacement relationship of the walls. Utilizing these two force-displacement relationships (resistance functions), a generalized single-degree-of-freedom (SDOF) model is developed to capture the nonlinear out-of-plane dynamic response of the retrofitted walls under blast loads. The SDOF model captured the experimentally observed displacement responses of the tested walls with reasonable accuracy. The model was also used to investigate the influence of block thickness, wall slenderness ratio, blast load intensity, and blast pulse shape on the out-of-plane dynamic response of retrofitted walls. The results demonstrated that anchored steel-stud systems could significantly enhance the out-of-plane capacity of the retrofitted walls by increasing their out-of-plane capacity and reducing their displacement.
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Acknowledgments
The following organizations are gratefully acknowledged for their support of this study: the Chemical, Biological, Radiological/Nuclear and Explosives Research and Technology Initiative (CRTI Project UNSPECIFIED06-015TD) for the financial support, the Canadian Explosives Research Laboratory (CERL) for conducting the blast tests, the Canadian Armed Forces for the use of the test range, the Natural Sciences and Engineering Research Council of Canada (NSERC)NSERC, the Canadian Concrete Masonry Producers Association (CCMPA) for donating the masonry blocks, the Canada Masonry Design Center (CMDC) for building the walls, the Bailey Metal Products Limited (BAILEY) for donating the steel studs, and the Center for Effective Design of Structures (CEDS) at McMaster University funded through Ontario Research and Development Challenge Fund (ORDCF), a program of the Ministry of Research and Innovation (MRI) for their financial support.
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Information & Authors
Information
Published In
Journal of Performance of Constructed Facilities
Volume 25 • Issue 5 • October 2011
Pages: 411 - 421
Copyright
© 2011 American Society of Civil Engineers.
History
Received: Oct 13, 2010
Accepted: Jun 14, 2011
Published online: Jun 16, 2011
Published in print: Oct 1, 2011
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