Dissertation
Effects of Geometric, Damping, and Boundary Parameters on the Dynamic Response of Cross-Laminated Timber Rocking Wall Systems
Washington State University
Doctor of Philosophy (PhD), Washington State University
01/2022
DOI:
https://doi.org/10.7273/000004573
Handle:
https://hdl.handle.net/2376/125005
Abstract
The continuous search for new construction techniques and materials has led to an increased interest in Cross-Laminated Timber (CLT) in the United States. Particularly, Post Tensioned (PT) CLT rocking wall structures paired with yielding dissipator devices have been trending in recent years; they represent a potential alternative as primarily lateral resistance system in high seismic regions because of both structural and environmental benefits.Past investigations have shown that PT CLT rocking walls can withstand major earthquake events, presenting a satisfactory displacement response and concentrating the damage only in the energy dissipator devices and at the base of the walls, maintaining most of the CLT panel in its elastic range. However, research has indicated that the dynamic response of mid-rise rocking systems and CLT wall structures is influenced by higher modes, which amplifies the acceleration response and increases the seismic forces into de structure, risking the integrity of the lateral system.
This investigation focused on studying the influence of geometric, damping, and boundary parameters on the dynamic response of low- and mid-rise PT CLT rocking wall systems. It was analyzed the influence of additional rocking joints, position of the PT rods, wall aspect ratio, and type and location of the dissipator devices. In total, 36 structures were subjected to nonlinear time-history analyses, using 44 far-field acceleration traces. There were assessed acceleration, displacement, inter-story drift ratio, shear, and moment profiles; average volume of damaged CLT; and the Fourier amplitude spectrum of the roof acceleration response.
The analysis results showed that the presence of multiple rocking joints, lower wall aspect ratios, and inclusion of viscous dampers improved the seismic performance and decreased the influence of higher modes in CLT wall structures: additional rocking interfaces had more impact in taller structures and with reduced initial PT force, the aspect ratio had more effect in shorter structures, and viscous dampers were more effective when uniformly distributed. In contrast, the repositioning of the PT rods only reduced the expected damage in the CLT walls, maintaining the global responses essentially unchanged, regardless of the wall height.
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Details
- Title
- Effects of Geometric, Damping, and Boundary Parameters on the Dynamic Response of Cross-Laminated Timber Rocking Wall Systems
- Creators
- Gustavo Alejandro Acuña Alegría
- Contributors
- James D Dolan (Advisor)Christopher Motter (Committee Member)Donald Bender (Committee Member)Ji Y Lee (Committee Member)Shiling Pei (Committee Member)
- Awarding Institution
- Washington State University
- Academic Unit
- Civil and Environmental Engineering, Department of
- Theses and Dissertations
- Doctor of Philosophy (PhD), Washington State University
- Publisher
- Washington State University
- Number of pages
- 232
- Identifiers
- 99900898739301842
- Language
- English
- Resource Type
- Dissertation