Development and Testing of an Alternative Dissipative Posttensioned Rocking Timber Wall with Boundary Columns
Publication: Journal of Structural Engineering
Volume 142, Issue 4
Abstract
The unbonded posttensioned rocking and dissipative technology was first developed as the main outcome of the PREcast seismic structural systems (PRESSS) Program in the United States. After the first developments and significant refinement, the technology was extended to steel and, more recently, timber structures. The timber version, referred to as prestressed laminated (Pres-Lam) system can be either implemented for timber walls (single or coupled) or frames or a combination of the above, with unbonded posttensioning and supplemental dissipation devices. In unbonded posttensioned dissipative wall systems a combination of recentering capacity and energy dissipation leads to a controlled rocking mechanism, which develops a gap opening at the wall base. This generates an uplift displacement that is transferred to the floor diaphragm. This vertical displacement incompatibility can represent a potential issue if the connection detailing between floor and lateral resisting system is not designed properly. The same issue can be mitigated by adopting an alternative configuration of the rocking/dissipative wall system, based on the use of a column–wall–column posttensioned connection. This concept, originally proposed for precast concrete walls and referred to as prestressed wall with end column (PreWEC), has been extended and adapted to posttensioned timber structures and validated through experimental testing. The paper presents the design, detailing, and experimental testing of a two-thirds scale wall specimen of this alternative configuration. Different wall configurations are considered in terms of posttensioning initial force as well as dissipation devices layout. The experimental results confirm the excellent seismic performance of the system with the possibility to adopt multiple alternative configurations.
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Acknowledgments
The experimental campaign was funded by the Structural Timber Innovation Company. The technical support of Mosese Fifita and Daniel Moroder is also gratefully acknowledged.
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Published In
Journal of Structural Engineering
Volume 142 • Issue 4 • April 2016
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© 2015 American Society of Civil Engineers.
History
Received: Jun 30, 2014
Accepted: Jul 8, 2015
Published online: Aug 31, 2015
Discussion open until: Jan 31, 2016
Published in print: Apr 1, 2016
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