National Symposium on Wind Engineering Proceedings
Online ISSN : 2435-5437
Print ISSN : 2435-4392
Vol.27 (2022)
Conference information

Host: Japan Society of Civil Engineers

Co-host: Meteorological Society of Japan, Architectural Institute of Japan, Japan Association for Wind Engineering, Japanese Society of Steel Construction

Name : THE 27th NATIONAL SYMPOSIUM ON WIND ENGINEERING

Location : [in Japanese]

Date : December 05, 2022 - December 07, 2022

EFFECTS OF SPANWISE SHAPE CHANGE OF SIDE OPENINGS IN A BODY ON GALLOPING INSTABILITY
*Atsushi TAKADA, Tomomi YAGI, Kyohei NOGUCHI, Soichiro YAMAMOTO, Hiroshi MIYAMOTO, Jiaqi WANG
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Keywords: Galloping, Kármán vortex, Motion-induced vortex, Side surface opening
CONFERENCE PROCEEDINGS FREE ACCESS

Pages 123-126

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Abstract
The side openings of bridges affect the aerodynamic characteristics of bridges, but the detailed mechanism is not completely clear. To investigate the effect of side openings on galloping instability, wind tunnel tests were conducted to measure the aerodynamic forces and surface pressures on a model of a rectangular cylinder with two types of side openings and a side ratio is 2. As a result, it was clarified that the onset wind velocity of galloping was controlled by the flow exiting the model which was affected by the shape of the side opening, and that the excitation force of galloping was controlled by the distance between the separating flow and the model.
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