Experimental Study on Vortex-Induced Vibration of Steel Tubes in Transmission Towers at Various Inflow Conditions

With the extensive construction of ultra-high voltage (UHV) transmission lines, fatigue damage steel tube members caused by vortex-induced vibration (VIV) in tubular towers has received growing attention. Although some progress been made research VIV tubes uniform flow, there is still relatively scarce on at various inflow conditions. In this paper, a series wind tunnel tests are conducted to investigate subjected uniform, turbulent, and oblique flows. Three turbulence intensities (Iu = 5.9%, 9.7%, 12.6%), four yaw angles (? 10°, 20°, 30°, 40°) considered. The results show that response in-line (IL) direction negligible compared cross-flow (CF) direction. displacement amplitude gradually decreases as intensity increases, accompanied more unstable response. For inclined tube, maximum almost remains constant when ? ? while it sharply decreased case 30° 40°. Furthermore, was found so-called independent principle applicable for 10°.