Analytical Modeling of Posttensioned C-Shaped CLT Core Walls
Publication: Journal of Structural Engineering
Volume 149, Issue 3
Abstract
Post-tensioned (PT) timber technology, also referred to as Pres-Lam (prestressed laminated timber) provides a low damage seismic design solution. So far PT timber research and practical implementation have focused on moment resisting frames, planar shear walls and coupled planar shear wall—or column-wall-column—systems and their analytical prediction models were adapted and extended from precast concrete to account for the unique characteristics of engineered timber. Following a recent experimental study on a PT cross-laminated timber (CLT) C-shaped core-wall system aiming to enhance lateral strength and stiffness, this paper presents an analytical framework/model to capture three unique kinematic rocking mechanisms for a PT C-shaped CLT core-wall system connected primarily with self-tapping screws. Depending on the relative stiffness of the screwed connections to the PT and the energy dissipaters, the model considers different kinematic responses, and that a staged kinematic response could occur at different imposed core-wall base connection rotations. It also accounts for the material inhomogeneity of CLT with nonedge glued lamella and implements a nonlinear spring model for the screwed connections calibrated from component testing and expected elastic core-wall deformations. The study showed that, for the given specimen configurations presented, the compressive flange wall could be neglected for a PT C-shaped CLT core wall. The analytical model was verified against three large-scale 8.6 m high PT C-shaped core-wall experimental tests and the model prediction error was within 10%. The analytical model was limited to capturing the envelope (push-over) curve of a four wall PT C-shaped CLT core-wall system.
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Data Availability Statement
Some or all data, models, or code that support the findings of this study are available from the corresponding author upon reasonable request.
Acknowledgments
The authors would like to acknowledge the sponsorship of Specialty Wood Products Partnership, New Zealand Douglas-Fir Association, Australian Research Council Future Timber Hub, SPAX Pacific, BBR Contech, and the New Zealand Commonwealth Scholarship and Fellowship Plan. PTL Structural Consultants is acknowledged for the use of the Pres-Lam system and patent (2007) in this research. The technical comments from Dr. Tobias Smith are gratefully acknowledged.
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Information & Authors
Information
Published In
Journal of Structural Engineering
Volume 149 • Issue 3 • March 2023
Copyright
© 2023 American Society of Civil Engineers.
History
Received: Mar 1, 2022
Accepted: Oct 18, 2022
Published online: Jan 12, 2023
Published in print: Mar 1, 2023
Discussion open until: Jun 12, 2023
ASCE Technical Topics:
- Building materials
- Connections (structural)
- Continuum mechanics
- Core walls
- Dynamics (solid mechanics)
- Earthquake engineering
- Engineering fundamentals
- Engineering materials (by type)
- Engineering mechanics
- Errors (statistics)
- Geotechnical engineering
- Kinematics
- Kinetics
- Material mechanics
- Material properties
- Materials engineering
- Mathematics
- Mechanical properties
- Seismic design
- Shear walls
- Solid mechanics
- Statistics
- Structural engineering
- Structural members
- Structural systems
- Tension
- Walls
- Wood and wood products
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