Abstract

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Title:: Study on Aerodynamic Characteristics of 3D Variable Cross-section Stay Cables with Crescent-shape Ice Accretion

Author(s):: TAN Dong-mei; WANG Kai-li; QU Wei-lian; Hubei Key Laboratory of Roadway Bridge & Structure Engineering, Wuhan University of Technology

Keywords:: variable cross-section; ice accretion; stay cable; aerodynamic parameter; galloping

Abstract:: In order to investigate the influence of variable crosssection ice accretion on the aerodynamic characteristic of stay cables, the flow field of 3D variable crosssection stay cables with crescentshape ice accretion was numerical simulated by SST k-ω model of FLUENT. The model of variable crosssection stay cables with ice accretion was divided into six segments, and the aerodynamic forces of the segments with different ice accretion thicknesses were monitored. The drag and lift coefficients of each segment and the whole stay cable under full attack angle were obtained. The galloping coefficients were obtained based on Den Hartog criterion, and the galloping stability of variable crosssection stay cables with ice accretion was studied. The results show that the shape of variable crosssection ice accretion has important impact on the flow field of stay cables, and the flow field has obvious 3D flow characteristics. Each segment of variable crosssection stay cables with ice accretion exhibits different aerodynamic force characteristics and galloping stability due to the change of ice accretion thickness. Part of galloping force coefficients of variable crosssection stay cables with ice accretion computed by 3D simulation are less than zero, so the stay cables have the possibility of icing galloping. The variable crosssection ice accretion has important impact on aerodynamic characteristics of stay cables.