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Số người truy cập: 56,804,338

 Wind tunnel test on mitigation countermeasures for cable dry galloping
Tác giả hoặc Nhóm tác giả: Vo Duy Hung*, Hiroshi Katsuchi, Hitoshi Yamada and Mayuko Nishio
Nơi đăng: The 2014 World Congress on Advances in Civil, Environmental, and Materials Research (ACEM14); Số: 2014;Từ->đến trang: 57-71;Năm: 2014
Lĩnh vực: Kỹ thuật; Loại: Bài báo khoa học; Thể loại: Quốc tế
Dry state galloping is classified as one of the wind-induced large amplitude vibration phenomena in dry weather (without rain), onset at relatively higher reduced wind speed compare to vortex-induced vibration. Some reports showed the existence of dry-state galloping by not only wind tunnel test but also the field of observation. Nevertheless, the countermeasures and design guideline for this phenomenon have not developed well yet. In this study, dry-state galloping was investigated by wind tunnel test (WTT) with various kinds of relative wind angle and three types of countermeasures were proposed to suppress dry-state galloping of stay cables. The wind tunnel test was carried out in a wind tunnel circuit of the Yokohama National University, the size of the working section is 1.3m wide x 1.8m high. WTT was conducted on an elastically supported section model of a stay cable. The supporting system of cable model is 1-DOF in the vertical direction. Cable model of 1.8m was tested to observe the characteristics of the cylinder oscillation as well as to determine the critical relative angle range for dry-state galloping. In addition, spiral wire, double spiral wires and circular ring were proposed to suppress the dry-state- galloping and tested to verify the mitigation effectiveness. By conducting many series tests with different cable attitudes and wind angles, it was found that dry-state-galloping only occurred in some range of wind angles at high-reduced wind speed. Furthermore, single spiral wire, double spiral wire and circular rings are well effective in reducing dry-state-galloping when they are installed at proper spacing with suitable wire diameter. The detail is further discussed in the full paper.

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