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Long-term field test of temperature gradients on the composite girder of a long-span cable-stayed bridge.
- Source :
-
Advances in Structural Engineering . Oct2019, Vol. 22 Issue 13, p2785-2798. 14p. - Publication Year :
- 2019
-
Abstract
- Bridges are inevitably affected by daily, seasonal and annual air temperature and solar radiation. The thermal effects on bridges, especially for long-span cable-stayed bridges with composite girders, are significant and complicated. The evaluation of temperature distribution has been a primary concern to bridge engineers and researchers. This article presents a more than one-year temperature database of a long-span cable-stayed bridge with a small cantilever length-to-web depth ratio in the composite girder. Uniform temperature, linear temperature difference, thermal curvature, and self-equilibrated thermal stress are considered to imply the characteristics of the temperature distribution in such composite girders. Two profiles (profile 1 and profile 2) for positive vertical temperature gradient and one profile (profile 3) for negative vertical temperature gradient are proposed. The extreme temperature differences with a 100-year return period are determined for each profile with extreme value analysis. Among the three profiles, profile 2 is unique for composite girders with a small cantilever length-to-web depth ratio. Based on parametric studies, profile 2 is revised with the cantilever length-to-web depth ratio for wide applications. Finally, comparisons of vertical temperature gradients are made between the investigated composite girder and the recommendations in Chinese Specification. [ABSTRACT FROM AUTHOR]
Details
- Language :
- English
- ISSN :
- 13694332
- Volume :
- 22
- Issue :
- 13
- Database :
- Academic Search Index
- Journal :
- Advances in Structural Engineering
- Publication Type :
- Academic Journal
- Accession number :
- 138251442
- Full Text :
- https://doi.org/10.1177/1369433219851300