Fire-Resistance Design Method for Stainless Steel Tubular X-Joints
Publication: Journal of Structural Engineering
Volume 148, Issue 1
Abstract
An experimental study was carried out on the fire-resistant performance of six stainless steel tubular X-joints. The failure process and behavioral responses of all specimens were determined, and the failure criteria of stainless steel tubular X-joints at elevated temperatures was developed. Numerical simulation was performed of the stainless steel tubular X-joints subjected to fire, and the accuracy of the model was verified by comparison with the experimental results. By referring to the yield line model in the existing specifications, a yield line model that simultaneously considers the deformation of the chord flange and web was established for stainless steel tubular X-joints. Through theoretical derivation and fitting, the prediction formula of failure temperature for stainless steel tubular X-joints without considering the effect of chord preload was obtained and then modified with the finite-element results. The adverse effect of chord preload on the failure temperature of tubular X-joint was explored using parametric analysis, and the expression of the reduction factor of failure temperature for stainless steel tubular X-joints under chord preload was obtained. A fire-resistance design method for stainless steel tubular X-joints under chord preload is proposed.
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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 the financial support of the National Natural Science Foundation of China (Nos. 51378105 and 51878146) and the National Key Research and Development Program of China (No. 2017YFC0703802). The research also was sponsored by the Qing Lan Project in Jiangsu Province and the Scientific Research Foundation of the Graduate School of Southeast University.
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Published In
Journal of Structural Engineering
Volume 148 • Issue 1 • January 2022
Copyright
© 2021 American Society of Civil Engineers.
History
Received: Mar 15, 2021
Accepted: Aug 10, 2021
Published online: Oct 22, 2021
Published in print: Jan 1, 2022
Discussion open until: Mar 22, 2022
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