Experimental Analysis of Temperature Gradient Patterns of Concrete-Filled Steel Tubular Members
Publication: Journal of Bridge Engineering
Volume 24, Issue 11
Abstract
Concrete-filled steel tubes (CFSTs) have been applied widely as the main members in bridge structures; however, the temperature gradients have not been studied sufficiently. To fill this gap, a long-term experimental and analytic study was conducted on four CFST members with different inclinations and orientations. Then a systematic 2-step approach with curve fitting and extreme value analysis (EVA) was proposed to establish the most unfavorable vertical temperature gradient (VTG) and transverse temperature gradient (TTG) patterns with the extreme temperature differences (TDs) in a 100-year return period. The curve fittings show that both VTG and TTG profiles can be described by two piecewise functions with multiple parabolas. And EVA shows that TDs in positive VTG, negative VTG, and positive TTG all fit the Weibull distribution well, while the TDs in negative TTG all fit the Gumbel distribution better. Comparison analysis shows that the Chinese specification underestimates the temperature gradients of CFST bridges. The proposed temperature gradient patterns are more suitable for probabilistic limit-state design for thermal effect calculations of CFST bridges than the Chinese specification.
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Acknowledgments
This study is funded by the National Natural Science Foundation of China (No. 51978061) and the Special Fund for Basic Scientific Research of Central College of Chang'an University (No. 300102219310), which are gratefully acknowledged.
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Published In
Journal of Bridge Engineering
Volume 24 • Issue 11 • November 2019
Copyright
© 2019 American Society of Civil Engineers.
History
Received: Jan 2, 2019
Accepted: May 29, 2019
Published online: Sep 12, 2019
Published in print: Nov 1, 2019
Discussion open until: Feb 12, 2020
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