Numerical Evaluation of Sea Salt Amounts Deposited on Bridge Girders
Publication: Journal of Bridge Engineering
Volume 22, Issue 7
Abstract
It is important to evaluate the amount of airborne sea salt adhering to the structural members of a bridge for effective maintenance. This study sought to develop a method to estimate salt conditions on individual road bridge girders. The estimation was based on airborne sea salt concentrations obtained by on-site observations using new equipment, a steady flow of wind around the bridge with a computational fluid dynamics (CFD) technique, and the washing-out effect (detachment of adhered particles) resulting from raindrops. The estimated salt amounts adhering to bridge girders showed the same tendency in distribution on the seaward surfaces of the webs but not on the cliff-side surfaces. Additionally, the relationship between the amounts on the upper and lower surfaces of the bottom flanges was better reproduced by considering the effect of gravity on the sea salt particles. Consideration of the spatial distribution and changes over time of airborne sea salt concentrations and wind is needed to improve the estimation accuracy. The significance of the washing-out effect on the salt amount was also clarified.
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Acknowledgments
This research was supported in part by the Kinki Regional Development Bureau, Ministry of Land, Infrastructure, Transport, and Tourism, Japan, and JSPS KAKENHI Grants 15H02261 and 16J09269 (Grant-in-Aid for JSPS Research Fellow). The supercomputer of the Academic Center for Computing and Media Studies (ACCMS), Kyoto University, was used for the flow simulation. The authors also thank Dr. H. Hattori, previously at Kyoto University, and Mr. S. Tanaka, Mr. S. Okuda, Mr. N. Kurata, Mr. Y. Kang, Ms. Y. Kaneshiro, Mr. S. Hata, Mr. K. Mihoichi, and Mr. H. Ii, former or current students at Kyoto University, and Mr. Y. Miyasaka and Mr. S. Kawauchi for their contributions to this research.
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Information
Published In
Journal of Bridge Engineering
Volume 22 • Issue 7 • July 2017
Copyright
© 2017 American Society of Civil Engineers.
History
Received: Aug 16, 2016
Accepted: Jan 26, 2017
Published online: Mar 29, 2017
Published in print: Jul 1, 2017
Discussion open until: Aug 29, 2017
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