Statistical Investigation on the Temperature Actions of CFST Truss Based on Long-Term Measurement
Publication: Journal of Bridge Engineering
Volume 26, Issue 8
Abstract
Concrete-filled steel tube (CFST) trusses are the most common elements used in long-span CFST bridges; however, the temperature actions have not been systematically investigated. This paper presents a long-term temperature measurement on a CFST truss segment and decompose its temperature actions into uniform temperature, vertical temperature difference (VTD) between upper and lower chords, and lateral temperature difference (LTD) between left and right chords. Based on the recorded long-term meteorological data, empirical formulae were established to predict these temperature actions and prove with a high degree of confidence. Subsequently, an effective extreme value analysis (EVA) based on the Monte Carlo method was presented to calculate the representative values of these temperature actions. All these values are greater than the recommended values in the Chinese Code Specification. Based on a series of frequency analysis on each temperature action, three potential combinations were finally determined. The combinations were all input into a frame finite-element model of a 220 m span CFST arch bridge for the thermal response calculation and comparisons with the Specification temperature actions and dead load. These efforts suggest that the investigative methodology and the proposed temperature action combinations can expand the provisions of the Chinese Code Specification and are more suitable for the thermal response calculation and design of CFST arch bridges with a truss arch rib.
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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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Journal of Bridge Engineering
Volume 26 • Issue 8 • August 2021
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© 2021 American Society of Civil Engineers.
History
Received: May 7, 2020
Accepted: Mar 14, 2021
Published online: May 26, 2021
Published in print: Aug 1, 2021
Discussion open until: Oct 26, 2021
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