Monitoring and Assessment of Buckling in Slender Members with Varying Lateral Restraint and Thermal Loading Using Distributed Sensing
Publication: Journal of Structural Engineering
Volume 150, Issue 1
Abstract
Buckling of slender members due to gravity loading or thermal effects is influenced by the member’s geometric imperfections, boundary conditions, and intermediate lateral supports. When assessing the capacity of such members, these parameters are often unknown (e.g., the rotational stiffness of end connections in a truss or the lateral support provided by the ties to a rail track), and conservative assumptions must be made resulting in conservative assessments. Distributed fiber optic sensors (DFOS) can potentially be used to determine these parameters with greater accuracy using strain measurements along the length of a member. A series of buckling experiments was conducted on a slender member instrumented with DFOS subjected to axial load with varying levels of lateral restraint or to increasing temperature. The distributed strain data were then used to evaluate the geometric imperfections, boundary conditions, and lateral support stiffness. These inputs were used to create a finite-element model to estimate the ultimate load response of the member using data acquired at service loads.
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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 Natural Sciences and Engineering Research Council (NSERC) of Canada, and Transport Canada for their financial support of this research. This project was supported in part by collaborative research funding from the National Research Council of Canada’s Artificial Intelligence for Logistics Program. The authors are also grateful to Graeme Boyd, Emily Arkell, and Yuchen Liu and Jiying Fan from Queen’s University, and Dr. Artur Guzik from Neubrex Co., Ltd for their technical assistance.
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© 2023 American Society of Civil Engineers.
History
Received: Apr 5, 2023
Accepted: Aug 11, 2023
Published online: Oct 17, 2023
Published in print: Jan 1, 2024
Discussion open until: Mar 17, 2024
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