Modeling Hysteretic Behavior of Wood Shear Walls with a Protocol-Independent Nail Connection Algorithm
Publication: Journal of Structural Engineering
Volume 138, Issue 1
Abstract
This paper presents an extension to an algorithm called HYST to develop the hysteresis characteristics of a nail connection. The paper also discusses the implementation of the algorithm in a finite-element model of a wood shear wall, called WALL2D, to study the hysteretic wall response. The HYST algorithm is a protocol-independent and mechanics-based procedure that considers the nail shank as steel beam elements and the wood embedment medium as compression-only spring elements smeared along the nail shank. By accounting for the stiffness degradation of the wood embedment medium under cyclic loading, HYST can fully address strength/stiffness degradation and the pinching effect in the hysteresis of typical nail connections. HYST was verified by the load-slip hystereses from nail connections tested with two different loading protocols. The WALL2D application model consists of linear elastic beam elements for framing members, orthotropic plate elements for sheathing panels, linear springs for framing connections, and oriented nonlinear springs for panel-frame nail connections. The hysteretic behavior of the nonlinear springs is represented by the HYST algorithm. The wall model was verified by reversed cyclic test results of two types of shear walls.
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Acknowledgments
Research grants from the Natural Sciences and Engineering Research Council of Canada (NSERC)NSERC and Coast Forest Products Association of British Columbia are gratefully acknowledged. The authors extend their appreciation to Mr. Minoru Okabe from the Centre for Better Living of Japan and Dr. Takafumi Nakagawa from the Building Research Institute of Japan for providing technical information on the JIS nails and the post-and-beam framing connections.
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Information & Authors
Information
Published In
Journal of Structural Engineering
Volume 138 • Issue 1 • January 2012
Pages: 99 - 108
Copyright
© 2012 American Society of Civil Engineers.
History
Received: Aug 11, 2010
Accepted: May 20, 2011
Published online: May 25, 2011
Published in print: Jan 1, 2012
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