Experimental and Numerical Investigation of Long-Term Loss of Prestressing Force in Posttensioned Timber Joints with Different Structural Details
Publication: Journal of Structural Engineering
Volume 148, Issue 9
Abstract
The long-term performance of posttensioned timber joints is closely related to the time-dependent prestressing force. Figuring out the variation of prestressing forces is vital for the long-term safety of posttensioned timber joints. In this study, posttensioned timber joints with different structural details were monitored over 750 days to investigate the prestressing force loss under varying environment. The time-dependent variations of temperature and relative humidity, moisture content, timber strain, and prestressing force were captured. The effects of key factors including prestressing ratios, timber deformation, environmental conditions, and reinforcements on the time-dependent prestressing force were carefully analyzed. Subsequently, a numerical model was established to simulate the prestressing force variation of posttensioned timber joints. Good agreements between experimental and simulated results validated the proposed numerical model. Lastly, the potential loss of prestressing force in posttensioned timber joints during a service life of 50 years was predicted by the validated numerical model. This study demonstrates that the prestressing ratios and environmental conditions have significant influence on the time-dependent prestressing force. As expected, the effect of deformation perpendicular to the grain on loss of prestressing force is much bigger than that of deformation parallel to the grain. Moreover, the steel reinforcement can effectively eliminate the loss of prestressing force.
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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 gratefully acknowledge National Natural Science Foundation of China (Grant No. 51878476) and China Scholarship Council (Grant No. 202006260205).
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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: Dec 23, 2021
Accepted: Apr 15, 2022
Published online: Jun 28, 2022
Published in print: Sep 1, 2022
Discussion open until: Nov 28, 2022
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Cited by
- Xiuzhi Zheng, Frank Lam, Zheng Li, Minjuan He, Long-term performance assessment of post-tensioned timber connections under different climates, Construction and Building Materials, 10.1016/j.conbuildmat.2023.130360, 368, (130360), (2023).