Rotational Behavior of Bolted Beam-to-Column Connections with Locally Cross-Laminated Glulam
Publication: Journal of Structural Engineering
Volume 141, Issue 4
Abstract
This paper summarizes the results of an experimental study on the rotational behavior of bolted beam-to-column glulam connections reinforced using locally cross-laminated glulam members. Twenty-two full-scale connection specimens were tested through monotonic and reversed cyclic loading, from which the moment / rotational angle relationships were established. The results indicated that the cross-laminated technique leads to a more ductile failure mode with cross-aligned inner layers of laminas fractured, in contrast to the perpendicular-to-wood-grain tensile failure of unreinforced connections. The connection maximum moment was found to increase by 52% and 46% under monotonic and cyclic loading, respectively; moreover, the deformability ratio evaluated on the basis of the rotation angles corresponding to the yielding and maximum moments of the connections was increased by 94%. Locally cross-laminated connections were also found to dissipate more energy (25%) than unreinforced connections. A comparison of the cross-laminated technique with self-tapping screws indicated that the respective reinforcing effects were comparable with that of the screws being slightly higher. Because the locally cross-laminated technique is readily incorporated into the production of cross-laminated timber products, it may have broad applications in heavy timber-bolted connections.
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Acknowledgments
This research was supported financially by the National Natural Science Foundation of China (Grant No. 51008221) and the Research Fund for the Doctoral Program of Higher Education of China (Grant No. 20100072120001). Special thanks are given to the Suzhou Crownhomes Co. Ltd for the preparation and provision of the connection specimens.
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Published In
Journal of Structural Engineering
Volume 141 • Issue 4 • April 2015
Copyright
© 2014 American Society of Civil Engineers.
History
Received: May 20, 2013
Accepted: Jan 22, 2014
Published online: Jul 11, 2014
Discussion open until: Dec 11, 2014
Published in print: Apr 1, 2015
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