液態調諧質量阻尼器於單自由度系統試驗與分析研究

Analytical investigations of square Tuned Liquid Damper (TLD) for suppressing horizontal motion of SDOF system

阮青玲(NGUYEN THANH LINH)

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(2014年)

https://doi.org/10.6342/NTU.2014.00817

摘要

無資料

關鍵字

液態調諧質量阻尼器

並列摘要

A Tuned Liquid Damper (TLD) is a passive control device on the top of a structure so that dissipates the input excitation energy rely on the liquid sloshing in the container as well as through the liquid boundary layer friction, the free surface contamination and wave breaking. In order to design an efficient TLD, using Fujino’s model to illustrate the liquid behavior as well as knowing optimum TLD parameters are crucial importance.
Numerical simulations of a single-degree-of-freedom (SDOF) structure, rigidly supporting a tuned liquid damper (TLD) and subjected to both wind and earthquake ground motions, show that a properly designed TLD can significantly reduce the structure's response to these motions.
The TLD is a rigid, square tank with shallow water in it. Its fundamental linear sloshing frequency is tuned to the structure's natural frequency. The TLD is more effective in reducing structural response as the ground excitation level increases. This is because it then dissipates more energy due to sloshing and wave breaking.
A larger water-depth to tank-length ratio than previous studies (0.1) suggested, which still falls within the constraint of shallow water theory, is shown to be more suitable for excitation levels expected in strong earthquake motions.
A larger water-mass to structure-mass ratio is shown to be required for a TLD to remain effectiveness and ensure structural safety.
Furthermore, the reduction in response is seen to be fairly insensitive to the bandwidth of the ground motion but is dependent on the structure's natural frequency relative to the significant ground frequencies. By numerical method, therefore, observing that maximum response of system with TLD is in resonance condition.

並列關鍵字

Tuned Liquid Damper ； Harmonic excitation ； Earthquake ； Liquid sloshing ； Energy dissipation ； Response control ； Selection TLD parameters

參考文獻

1. Yozo Fujino, Limin Sun, Benito M.Pacheco and Piyawat Chaiseri. Tuned Liquid Damper (TLD) for suppressing horizontal motion of structures. Journal of Engineering Mechanics, Vol.118, No.10 October, 1992.

2. Pradipta Banerji, Mohan Murudi, Arvind H.Shah and Neil Popplewell. Tuned Liquid Dampers for controlling earthquake response of structures. Earthquake Engng Struct. Dyn. 2000.

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7. Takashi Shimizu and Shinji Hayama. Nonlinear response of sloshing based on the shallow water wave theory (1st report, Derivation of Basic Equations and Nonlinear Response in Rectangular Tanks). NII Electronic Library service, 1987.