Rocking Timber Structure with Slip-Friction Connectors Conceptualized As a Plastically Deformable Hinge within a Multistory Shear Wall
Publication: Journal of Structural Engineering
Volume 142, Issue 4
Abstract
Recent experiments on a rigid timber wall panel with slip-friction connectors have demonstrated the feasibility of enabling elastoplastic behavior in structures that would otherwise be essentially rigid. The slip-friction connectors are adopted as the hold-downs that anchor the ends of the wall to the foundation. These replace the traditionally used steel bracket hold-downs, which relied on inelastic damage to the screw or nail connections for energy dissipation. Overturning resistance of the wall directly relates to the slip-force in the slip-friction connectors. On the slip-force being reached, the intention is that the wall rocks in a controlled manner. A numerical study demonstrates the energy dissipation advantages of this approach. A direct-displacement-based design procedure is proposed for a multistory wall with slip-friction connectors. The wall is numerically modeled, and its response to earthquake time-history loadings compared with that of an idealized structure with a single plastic deformable hinge at the base. Results show that when gravity is not considered, the wall structure with slip-friction connectors behaves almost identically to that of its idealized equivalent. Taking into consideration higher mode effects of multi-degree-of-freedom (MDOF) rocking structures, base shears, and response accelerations are capped to the level expected, but residual displacements are significant. However, with self-weight considered, residual displacements of the wall are trivially small, and maximum displacements are also, in general, reduced. For the wall configurations investigated, the results suggest that a rocking timber wall unit at the base of a multistory shear wall will not only provide the load limiting benefits of a plastically deformable hinge, but also minimize maximum drifts, and allow for the structure to restore to its original position.
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Acknowledgments
The authors would like to thank the New Zealand Ministry for Primary Industries for the support of this research, and the reviewers for their suggestions and constructive comments that have improved the clarity of this paper.
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Information
Published In
Journal of Structural Engineering
Volume 142 • Issue 4 • April 2016
Copyright
© 2015 American Society of Civil Engineers.
History
Received: Jul 2, 2014
Accepted: Jul 2, 2015
Published online: Aug 26, 2015
Discussion open until: Jan 26, 2016
Published in print: Apr 1, 2016
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