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Structural Engineering and Mechanics Volume 30, Number 1, September10 2008 , pages 1-20 DOI: https://doi.org/10.12989/sem.2008.30.1.001 |
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Passive, semi-active, and active tuned-liquid-column dampers |
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Yung-Hsiang Chen and Ying-Jan Ding
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| Abstract | ||
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The dynamic characteristics of the passive, semi-active, and active tuned-liquidcolumn dampers (or TLCDs) are studied in this paper. The design of the latter two are based on the first one. A water-head difference (or simply named as water head in this paper) of a passive TLCD is pre-set to form the so-called semi-active one in this paper. The pre-set of water head is released at a proper time instant during an earthquake excitation in order to enhance the vibration reduction of a structure. Two propellers are installed along a shaft inside and at the center of a passive TLCD to form an active one. These two propellers are driven by a servo-motor controlled by a computer to provide the control force. The seismic responses of a five-story shear building with a passive, semiactive, and active TLCDs are computed for demonstration and discussion. The responses of this building with a tuned mass damper (or TMD) are also included for comparison. The small-scale shaking-table experiments of a pendulum-like system with a passive or active TLCD to harmonic and seismic excitations are conducted for verification. | ||
| Key Words | ||
| TLCDs; modelling; controls; experiments. | ||
| Address | ||
| Yung-Hsiang Chen: Dept. of Civil Engineering, National Taiwan University, Taipei, Taiwan, R.O.C. Ying-Jan Ding: Construction and Planning Agency, Ministry of the Interior, Taipei, Taiwan, R.O.C. | ||