Research on the Tensile Behavior of Stiffened Welded Hollow Spherical Joints Exposed to Fire
Publication: Journal of Structural Engineering
Volume 149, Issue 10
Abstract
Fire hazards are generally considered to be one of the major disasters that cause damage to grid structures, and when exposed to fire, their mechanical properties will directly affect whether the structure is safe. In this paper, the failure mode, strain analysis, load-displacement curve, initial axial stiffness, bearing capacity, and ductility of the joint are analyzed by the tensile testing of stiffened welded hollow spherical joints exposed to fire. The results show that the failure of the joint exposed to fire is a pull-out failure. With increasing temperature, the initial axial stiffness and bearing capacity of the joints gradually decrease. The ductility of joints exposed to fire shows an increasing trend with increasing temperature. The finite element model is verified based on the experimental results. Through parametric analysis, the calculation method for measuring the bearing capacity and initial axial stiffness of tensile-stiffened welded hollow spherical joints exposed to fire are proposed.
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Data Availability Statement
All data, models, and code generated or used during the study appear in the submitted article.
Acknowledgments
This work was supported by the Jiangsu Provincial Postgraduate Research and Practice Innovation Program Project (Grant No. KYCX21_1155).
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Published In
Journal of Structural Engineering
Volume 149 • Issue 10 • October 2023
Copyright
© 2023 American Society of Civil Engineers.
History
Received: Mar 22, 2023
Accepted: May 16, 2023
Published online: Aug 4, 2023
Published in print: Oct 1, 2023
Discussion open until: Jan 4, 2024
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