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| Analyses of Semi-active Control of Earthquake Response to Building Structure by Magneto-rheological Damper |
| CHEN Shui-sheng , LI Jin-hua |
| East China Jiaotong University, Nanchang, Jiangxi 330013，China |
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Abstract Research purposes : People have paid attention to the large vibration of building structure during earthquake. Magneto-theological dampers have been applied in control of the vibration of civil structure in foreign countries with a perfect achievement. The further theoretical analyses and tests are done for the earthquake response of building structure by magnet-rheological damper for the purpose of widening the application of magnet-theological damper in construction.
Research methods : Through changing the composite parameters of magneto-theological damper(such as the effective length of piston, inner diameter of cylinder and fluid viscosity)，input current and frequency of simple harmonic motion of magneto-rheological damper against cylinder, the analyses are made for the parameters of influencing magneto- theological damper for providing the theoretical basis for better design of magneto-theological damper. Then the analytical researches are done on the semi-active control of earthquake response to building structure with the modified Bouc - Wen Model of magneto-theological damper and Clipped-Optimal Control Method, and the results of semi- active control are compared with the results of semi-passive control of structure.
Research Conclusions : The compared result shows there are different control effects on horizontal displacement and velocity of structure under the effects of EI-centro earthquake and the effects of semi-active control is better than that of passive control in control of horizontal displacement and velocity.
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Received: 20 June 2006
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2007, Vol. 24 
