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 Toward a further understanding of rain-wind induced vibration through experimental works
Tác giả hoặc Nhóm tác giả: Vo Duy Hung* , Hiroshi Katsuchi, Hitoshi Yamada and Mayuko Nishio
Nơi đăng: International summer conference - Japan Society of Civil engineers; Số: 17;Từ->đến trang: cs2;Năm: 2015
Lĩnh vực: Kỹ thuật; Loại: Bài báo khoa học; Thể loại: Quốc tế
TÓM TẮT

ABSTRACT
Rain wind induced vibration of cable has been observed on many cable-stayed bridges, not only in Japan but also all over the world. The combination of rain flow and wind can cause large amplitude cable vibrations of stay cables at low frequencies. These vibrations occurred typically when rain and moderate wind speeds (8–15m/s) combined in the direction angled 20° to 60° to the cable plane, with the cable declined in the direction of the wind. The frequencies were low, typically less than 3 Hz. The peak amplitudes were very high, in the range of 0.25 to 1.0 m, violent movements resulting in the clashing of adjacent cables observed in several cases. In addition, Matsumoto at el (1995) found that the divergent response could be found, because the formation of the upper rivulet at a certain location on the cable surface or the generation of the axial flow behind a yawed cable causes a negative slope of the lift force coefficient. Besides that, field of observations has shown that rivulets of water running down the upper and lower surfaces of the cable in rainy weather were the essential component of this aeroelastic instability. The water rivulets changed the effective shape of the cable and moved as the cable oscillated, causing cyclical changes in the aerodynamic forces, which led to the wind feeding energy into oscillations. The wind direction causing the excitation was approximately 45° to the cable plane. The particular range of wind velocities that caused the oscillations appears to be that which maintained the upper rivulet within a critical zone on the upper surface of the cable. unfaithful spouse developerstalk.com i dreamed my husband cheated on me
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