S-Space College of Engineering/Engineering Practice School (공과대학/대학원) Dept. of Civil & Environmental Engineering (건설환경공학부) Theses (Master's Degree_건설환경공학부)
Effect of Turbulence Intensity and Length Scale on Vortex-Induced Vibration of Parallel Cable-Stayed Bridges
난류길이와 난류강도가 병렬교량 와류진동에 미치는 영향
- 공과대학 건설환경공학부
- Issue Date
- 서울대학교 대학원
- Parallel bridge; Turbulence intensity; Turbulence length scale; Vortex-induced vibration(VIV); Active turbulence generator; Grid
- 학위논문 (석사)-- 서울대학교 대학원 : 공과대학 건설환경공학부, 2018. 2. 김호경.
- In this study, the target turbulence length and turbulence intensity were generated by using active turbulence generator device and turbulence grid. The study carried out about the effect of the generated turbulent wind on vortex-induced vibration of parallel cable-stayed bridges. The developed active turbulence generator consists of aerofoil and flat gust. Two wing plates can control vertical and along-wind turbulent winds respectively. The relationship between the turbulent wind velocity and the wing motion was experimentally derived and the turbulence was simultaneously achieved by independently controlling each wing. Turbulent wind satisfied vertical and along-wind von karman spectrum at the same time. In order to verify the effects of turbulence length scale and intensity on the response to parallel bridges, three of the four variables (along-wind turbulence intensity, along-wind turbulence length scale, vertical turbulence intensity, vertical turbulence length scale) were used as control variables and the other one was used as a dependent variable. To verify whether the experimental results are characteristic of parallel bridge or not, compared response between single bridge test and parallel bridge test.
Among the variables, turbulence intensity was main factor in the amplitude response about parallel bridge section model. However, turbulence length scale was not main factor to response of bridge model.