Analytical Model Development for CLT Diaphragms Loaded Perpendicular to the Length of Panels
Publication: Journal of Structural Engineering
Volume 149, Issue 6
Abstract
The main objective of this study was to develop an analytical model for predicting the diaphragm deflection and the induced shear force at the panel joints when the applied load is perpendicular to the panel length. An equivalent finite-element model was developed to capture the elastic behavior of the diaphragm made from the panels and the connections in between. The analytical model’s predictions were compared with predictions from finite-element models. The results of an experimental test were used to partially validate the analytical and numerical models in the absence of full-scale diaphragm test data. A sensitivity analysis was carried out with the aim of finding the most influential parameters in the behavior of the cross-laminated timber (CLT) diaphragm. The connection’s stiffness and diaphragm size were varied. The difference in diaphragm deflection was investigated, and it was found that under realistic material properties and geometry, the diaphragm deflection was not strongly related to the connection’s stiffness. However, the floor’s geometry was the key influencing parameter. A parametric study was performed, and the contribution of each deflection component was quantified for each specific case. It was observed that the floor’s flexibility was dominated mainly by the shear deflection of the cross-laminated timber panels as well as the slip in the panel joints as the length of the diaphragm increased. This study proposes a method that designers may use to estimate the in-plane displacement of the cross-laminated timber diaphragm when it is loaded perpendicular to the panel’s length.
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Data Availability Statement
Some or all of the data, models, or codes that supported the findings of this study are available from the corresponding author upon request.
Acknowledgments
The authors would like to thank the Natural Sciences and Engineering Research Council of Canada (NSERC) for the financial support of this study under the Industrial Research Chair Program. Financial support was also provided by Landmark Group of Companies, FPInnovations, Canadian Wood Council, MTC Solutions, Rotho Blaas, Western Archrib, and Alberta Innovates. Their support is gratefully acknowledged.
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Information & Authors
Information
Published In
Journal of Structural Engineering
Volume 149 • Issue 6 • June 2023
Copyright
© 2023 American Society of Civil Engineers.
History
Received: Jun 8, 2022
Accepted: Dec 16, 2022
Published online: Mar 29, 2023
Published in print: Jun 1, 2023
Discussion open until: Aug 29, 2023
ASCE Technical Topics:
- Analysis (by type)
- Building materials
- Continuum mechanics
- Design (by type)
- Diaphragms (structural)
- Displacement (mechanics)
- Engineering fundamentals
- Engineering materials (by type)
- Engineering mechanics
- Finite element method
- Laminating
- Load factors
- Materials engineering
- Materials processing
- Methodology (by type)
- Numerical methods
- Panels (structural)
- Sensitivity analysis
- Solid mechanics
- Structural design
- Structural engineering
- Structural mechanics
- Structural members
- Structural systems
- Wood and wood products
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