| Title |
A Study on the Orifice Damping Characteristics of Tuned Liquid Column Damper with Various Excitation Amplitude |
| Authors |
You Ki-Pyo ; You Jang-You ; Song Chang-Hyun ; Kim Young-Moon |
| Keywords |
Tuned Liquid Coulmn Damper ; Shaking Table ; Head Loss Coefficient ; Excitation Amplitude ; Aperture Ratio ; Orfice |
| Abstract |
With the production of light weight and high strength construction materials and the advance of structure design techniques, various forms of high rise buildings are being constructed. These buildings cannot help considering the effect of wind load. Because wind velocity grows higher with the increase in height from the ground, high rise buildings respond sensitively to the wind and make vibration. In order to reduce the vibration, many additional mass devices are being developed. Recently, supplementary dampers using tuned liquid column damper (TLCD) are being developed actively. This study purposed to measure the amplitude response and the head loss coefficient of TLCD for different sizes of excitation amplitude according to the aperture ratio of orifice. In addition, we obtained the head loss coefficient according to the length of the horizontal column at natural frequency determined by the length of the vertical column and the horizontal column of TLCD. Thus, this study analyzed for the amplitude response and head loss coefficient of tuned liquid column damper according to the porosity of orifice while vibrating amplitude and natural frequency change. In addition, as the natural frequency of TLCD is determined by the length of the vertical and the horizontal column, we examined the variation of the head loss coefficient of orifices in adjusting natural frequency according to the length of the horizontal column. In the results of experiment, the larger vibrating amplitude was, the lower the head loss coefficient was. Under the same porosity, the head loss coefficient decreased by up to 4 times by 1mm of vibrating amplitude and 20mm of vibrating amplitude. Porosity and vibrating amplitude had a considerable effect on the head loss coefficient. When the length of the horizontal pipe increased, the overall head loss coefficient decreased by around 1.5-2 times. |