Study of Characteristics of Smart Base Isolation System with MR Damper for Regions of Low-to-Moderate Seismicity

In this paper, the effect of base stiffness on the performance of hybrid control system of base isolation system and magnetorheological (MR) damper has been studied and its appropriate base stiffness has been determined. Many researches have been proposed that in the structure controlled by the single base isolation system without MR damper, the base stiffness should be designed such that the fundamental period of isolated structure is almost triple the fundamental period of fixed-base structure. To determine the appropriate base stiffness of hybrid control system, different values have been considered as base stiffness and MR damper has been also employed in two cases of passive form that voltage and dynamical behaviour of MR damper is constant (hybrid base isolation) and semi-active form that MR damper voltage is applied by H2/linear quadratic Gaussian (LQG) and clipped-optimal control algorithms (smart base isolation). For numerical simulation, a three-story shear frame has been subjected to El Centro, Northridge and Tabas earthquakes. Results show that in the structure controlled by the single base isolation system, the peak responses of structure strongly depend on the base stiffness while the sensitivity of peak responses to the base stiffness is lower when the structure is controlled by hybrid base isolation system. According to results, it can be concluded that the peak base drift of hybrid base isolation system reduces with the increase of the base stiffness while this reduction trend is less considerable in the stiffness that are more than the proposed stiffness for the single base isolation system. Hence the proposed stiffness for single base isolation system is the appropriate stiffness for hybrid base isolation system, too. Results also show that under earthquakes considered in this paper, the smart base isolation system is mostly more effective than hybrid base isolation system in mitigating and controlling both root mean square and maximum of structure responses such as base drift, inter-story drift and acceleration.

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Investigation of Adaptability of Smart Base Isolation System for Spacial Structures in Regions of Low-to-Moderate Seismicity

Journal of the Korean Association for Spatial Structures ◽

10.9712/kass.2011.11.4.109 ◽

2011 ◽

Vol 11 (4) ◽

pp. 109-119 ◽

Cited By ~ 2

Author(s):

Hyun-Su Kim ◽

Joo-Won Kang

Keyword(s):

Base Isolation ◽

Isolation System ◽

Moderate Seismicity ◽

Base Isolation System ◽

Smart Base Isolation

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Research on Numerical Simulation of Smart Base Isolation System with MR Damper (I)

Applied Mechanics and Materials ◽

10.4028/www.scientific.net/amm.166-169.2467 ◽

2012 ◽

Vol 166-169 ◽

pp. 2467-2470 ◽

Cited By ~ 1

Author(s):

Wei Qing Fu ◽

Fei Chen ◽

De Hu Yu ◽

Ying Hao An

Keyword(s):

Numerical Simulation ◽

Base Isolation ◽

Mr Damper ◽

Magnetorheological Damper ◽

Structural Vibration ◽

Isolation System ◽

Isolation Layer ◽

Rubber Bearing ◽

Base Isolation System ◽

Smart Base Isolation

Rubber bearing base-isolation is well-developed vibration reduction technique and is applied in practical engineering broadly. The nature period of the base-isolation structure applied with rubber bearing is extended. Meanwhile the response of the superstructure is also reduced. But it is noticed that the displacement of isolation layer is too large. So it is required to find a suitable damper to reduce the displacement of isolation layer. Magnetorheological damper has good smart performances- broad controlled band, fast response and demand a little energy. In this paper smart base isolation system, which is combined with rubber bearing and MR damper is applied to structural vibration control, and have numerical simulation e of structure employing RB isolation and smart isolation in different kind and magnitude of earthquake waves. The result indicates the control system is effective.

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Research on Numerical Simulation of Smart Base Isolation System with MR Damper(II)

Applied Mechanics and Materials ◽

10.4028/www.scientific.net/amm.166-169.2513 ◽

2012 ◽

Vol 166-169 ◽

pp. 2513-2516

Author(s):

Wei Qing Fu ◽

Fei Chen ◽

Hong Mei Wang

Keyword(s):

Numerical Simulation ◽

Passive Control ◽

Base Isolation ◽

Mr Damper ◽

Magnetorheological Damper ◽

Isolation System ◽

Isolation Technique ◽

Rubber Bearing ◽

Base Isolation System ◽

Smart Base Isolation

Rubber bearing base-isolation is well-developed vibration reduction technique, and is applied in practical engineering broadly. But displacement of vibration isolating layer is large, so lead plug rubber bearing is used. It is passive control device; therefore its optimal central extent is narrow. That is isolating layer is optical in several defined kind and magnitude of earthquake waves, in the way controlled displacement and acceleration of superstructure is ideal. Magnetorheological damper has good smart performances- broad controlled band, fast response and demand a little energy. In this paper smart base isolation system, which is combined with rubber bearing and MR damper, is applied to structural vibration control, and have numerical simulation of structure employing LRB isolation and smart isolation in different kind and magnitude of earthquake waves. The result indicates smart base-isolation with MR damper can supply optimal control to these different earthquake waves, so is a good supplement and perfection for former isolation technique.

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