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 An optimization in using the auxiliary fillet on cable surface in various ways for controlling dry-galloping
Tác giả hoặc Nhóm tác giả: Vo Duy Hung, Hiroshi Katsuchi, Hitoshi Yamada and Mayuko Nishio
Department of Civil Engineering, Yokohama National University
Nơi đăng: 14th International Conference on Wind Engineering
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; Số: 14th;Từ->đến trang: - (accepted);Năm: 2015
Lĩnh vực: Kỹ thuật; Loại: Bài báo khoa học; Thể loại: Quốc tế

Cable vibration can cause the fatigue in cable attachments and it is unsettling to bridge user and operator. The complicated cable aerodynamics characteristic and itself vibration mechanism have being clarified by a lot of wind tunnel test and the field of observation so far. The common vibration of cable caused by rain-wind combination has been known as most typical type and a lot kind of its countermeasures has been proposed for suppressing this phenomenon. Recently, stayed-cables were also proved that they could be excited in dry state (without rain), which is called dry-galloping. Its mechanisms have been explained by axial flow, Reynolds number and so on. In order to investigate the dry-galloping characteristics, wind tunnel test of a cable model with various wind angle was conducted, the vibration responses and surface pressure has been recorded. Then, three types of countermeasure were examined to suppress dry- galloping of bridge cable. The tests confirmed that the occurrence of dry-galloping depends on relative wind attacked angles and onset reduced wind speed. Furthermore, due to the presence of auxiliary fillet, surface pressure was redistributed. Most importantly, single helical fillet, double helical fillet and circular ring were highly effective in mitigating dry-galloping when those are installed properly.
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