Vibration Performance and Stiffness Properties of Mass Timber Panel–Concrete Composite Floors with Notched Connections
Publication: Journal of Structural Engineering
Volume 148, Issue 9
Abstract
Mass timber panel–concrete composite (MTPCC) floors combine timber and concrete through high-performance connections to create an efficient floor system with high stiffness, high strength, and low self-weight. Previous research on MTPCC floors focused on improving the composite efficiency of floors under static loadings by testing different types of shear connectors. The dynamic performances of MTPCC floors, which can govern the floor span and thickness, have not been well investigated. In this study, vibration tests were conducted on glued-laminated timber panels and notch-connected MTPCC floors with different spans, thicknesses, and connection layouts. The dynamic properties, including natural frequencies, damping ratios, and mode shapes, were obtained for floors under different supporting conditions. Test results showed that MTPCC floors with a 6-m span had fundamental natural frequencies generally higher than 8 Hz. The addition of the concrete layer to the bare timber panels improved the floor fundamental natural frequency and damping. Deflection tests and walking tests were performed on MTPCC floors to evaluate the floor vibration serviceability performance, and it was found that the existing design criteria predicted inconsistent results. The flexural stiffness of MTPCC floors determined from vibration and deflection tests was close to full composite, while only partial composite action in the composite floors was achieved under a higher load level in destructive bending tests.
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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 financial support from the Natural Sciences and Engineering Research Council of Canada (NSERC) through the Industrial Research Chair program. The authors are also thankful to Wood Innovation Research Lab at the University of Northern British Columbia (Prince George, BC) for providing technical support and to Western Archrib and Rothoblaas for providing the materials used in this project.
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Published In
Journal of Structural Engineering
Volume 148 • Issue 9 • September 2022
Copyright
© 2022 American Society of Civil Engineers.
History
Received: May 14, 2021
Accepted: May 9, 2022
Published online: Jul 9, 2022
Published in print: Sep 1, 2022
Discussion open until: Dec 9, 2022
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