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Abstract

In order to realize the accurate description and prediction of the temperature field and temperature effect of the bridge structure, the characteristics of the transverse temperature gradient of a flat steel box girder in a mountainous area were analyzed. Firstly, based on the long-term monitoring data of the temperature field of the flat steel box girder structure of a suspension bridge in a mountainous area, the transverse temperature difference extremum was analyzed, and the asymmetric distribution characteristics of the structural temperature field were obtained by using cluster analysis. Then, the probability density model of the transverse temperature difference between the top and bottom plates of the steel box girder was established by statistical analysis, and the standard value of the transverse temperature difference between the top and bottom plates of the steel box girder was calculated by taking 50 years as the re-occurrence period. Finally, the transverse temperature differences at different positions were combined according to the most unfavorable condition, and the transverse temperature gradient mode of the top and bottom plates was obtained. The results show that the transverse temperature difference of the steel box is less affected by seasonal variation. Affected by the mountain landform, the structural temperature field has obvious asymmetric distribution characteristics. The probability statistical model of the transverse temperature difference between the top and bottom plates of the steel box girder is in good agreement with the double Gaussian model. Since the top plate is directly radiated by the sun, its transverse temperature difference is significantly larger than that of the bottom plate. The maximum absolute values of the standard transverse temperature difference between the top and bottom plates of the steel box girder are 37.68 °C and 13.37 °C, respectively. The top plate of the flat steel box girder in a mountainous area has three kinds of transverse temperature gradient modes: M-shape, W-shape, and oblique N-shape. The bottom plate has three kinds of transverse temperature gradient modes: V-shape, inverted V-shape, and straight line. The transverse temperature gradient modes of the top and bottom plates have obvious asymmetry.

Publication Date

11-24-2023

DOI

10.14048/j.issn.1671-2579.2023.05.023

First Page

135

Last Page

140

Submission Date

March 2025

Reference

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