液體調諧阻尼應用於多自由度結構之研究

Investigation of the Effect of Tuned Liquid Dampers (TLDs) on Multi-Degrees of Freedom (MDOF) Structures

阮國寶(Quoc Bao Nguyen)

指導教授 ： 張國鎮

國立臺灣大學/工學院/土木工程學研究所/碩士(2015年)

https://doi.org/10.6342/NTU.2015.00410

摘要

無資料

關鍵字

Shear Building ； Sloshing ； Tuned Liquid Damper ； Shallow Water Wave Theory ； Structural Control ； Damping ； Energy Dissipation.

並列摘要

Current trends in the construction industry demand taller and lighter structures, which are also more flexible and have quite a low damping value. Vibrations of such structures due to wind, earthquake, and other dynamic disturbances can create problems from serviceability or safety viewpoints. Several techniques are available today to minimize the vibration of the structure, in which concept of using Tuned Liquid Damper is a newer one. Tuned Liquid Damper (TLD) is a new type of mechanical damper which relies on the sloshing of shallow liquid in a rigid tank for suppressing structural vibrations. Recent growing interest in liquid dampers is attributable to several potential advantages, such as: low costs; easy to install in existing structures; applicable to temporary use; non-restriction to unidirectional excitation; effective even for small-amplitude vibrations; and few maintenance requirements.
The effect of rectangular TLDs on responses of a multi-degree of freedom (MDOF) structure to lateral dynamic excitations was studied theoretically and experimentally in this research. Numerical analysis was implemented by using the nonlinear model of rectangular TLD which was proposed by Sun L.M. [1]. In this study, by applying Sun’s model, which is based on the shallow water wave theory, to a MDOF shear building, the structural responses under Harmonic Ground Motion, El Centro Earthquake and TCU072 Earthquake were predicted, respectively. The shaking table test was then carried out with a three-story steel shear building specimen to verify the theoretical results. Both the numerical analysis and experiment considered the cases of different numbers of TLDs attached to the main structure. This research also investigated the influence of variation in TLD parameters including Tuning ratio, Depth ratio and Mass ratio on structural responses as well as estimated the damping ratio of the structure with and without TLDs.

並列關鍵字

Shear Building ； Sloshing ； Tuned Liquid Damper ； Shallow Water Wave Theory ； Structural Control ； Damping ； Energy Dissipation.

參考文獻

[1] Sun L.M., "Semi-Analytical Modeling of Tuned Liquid Damper (TLD) with Emphesis on Damping of Liquid Sloshing," PhD Thesis, 1991.

[2] Bauer H.F., "Oscillations of immiscible liquids in a rectangular container: A new damper for excited structures," Journal of Sound and Vibration, pp. 117-133, 1984.

[3] Modi V.J., Welt F., "Damping of wind induced oscillations through liquid sloshing," Journal of Wind Engineering and Industrial Aerodynamics, vol. 30, pp. 85-94, 1988.

[4] Fujii K., Tamura Y., Sato T., Wakahara T., "Wind-induced vibration of tower and practical applications of Tuned Sloshing Damper," Journal of Wind Engineering and Industrial Aerodynamics, vol. 33, pp. 236-272, 1990.

[5] Ahsan, Kareem, "Reduction of Wind Induced Motion Utilizing a Tuned Sloshing Damper," Journal of Wind Engineering and Industrial Aerodynamics, vol. 36, pp. 725-737, 1990.