Metal Plate–Connected Wood Trusses Exposed to Out-of-Plane Lateral Loads
Publication: Journal of Architectural Engineering
Volume 22, Issue 3
Abstract
Out-of-plane loading of trusses occurs when a horizontal force is applied to the truss perpendicular to the plane of the truss. Because trusses are not specifically designed for lateral loading, the behavior of trusses during construction before adequate bracing is installed is unknown. Examples of out-of-plane loading include wind and seismic forces, as well as forces from fall-arrest anchors attached to trusses during construction. The purpose of this paper was to measure the maximum load and rotation of a single truss exposed to a horizontal out-of-plane load applied by a fall-arrest anchor. A specialized testing fixture was used to apply a horizontal load to a single unbraced truss attached to two stem walls, representing a typical construction application. A set of monoslope queen-post trusses with two different pitches were used, and load was applied at both the truss eave and peak. Maximum loads for a single truss were much less than the expected 8 kN required to act as a personal fall-arrest anchor. The maximum moment was similar for trusses with different pitches. Rotational stiffness of the eave loadings was the result of truss rotation at the truss–wall connection. Rotational stiffness decreased as truss pitch increased. Analysis of out-of-plane loading should include the rotational stiffness of the truss–wall connection.
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Acknowledgments
This work was supported by National Institute for Occupational Safety and Health award 5R01OH009656 from the Centers for Disease Control and Prevention (CDC). Its contents are solely the responsibility of the authors and do not necessarily represent the official views of the CDC.
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Information & Authors
Information
Published In
Journal of Architectural Engineering
Volume 22 • Issue 3 • September 2016
Copyright
© 2016 American Society of Civil Engineers.
History
Received: Aug 21, 2014
Accepted: Oct 23, 2015
Published online: Jan 28, 2016
Discussion open until: Jun 28, 2016
Published in print: Sep 1, 2016
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