A Study on the Wake-Induced Vibration of Diagonal Bracing Member of A Steel Tower

Abstract

This study clarifies in a wind tunnel test the characteristics of wind forces on a diagonal bracing member in the wake of a column member of a steel latticed tower with members of circular cross-section. Furthermore, the wind responses of the bracing member are evaluated by using the wind forces in the modal analysis, and then compared with the responses obtained from the fullscale measurement. The surface of test model was roughened artificially by small circular section strings to improve local similarity with regard to Reynolds number to the full-scale measurements. When the entire bracing member is within the wake of the column, the fluctuating wind forces on are generated by the shedding vortex of the column. When only part of bracing is in the wake of the column, the fluctuating wind forces are composed of the components of the shedding vortex of the bracing member and the column. It is clarified that the evaluated wind responses of bracing member are in good agreement with the full-scale measurement values, and are mainly affected by the shedding vortex of the windward column.