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CivilComp Proceedings
ISSN 17593433 CCP: 96
PROCEEDINGS OF THE THIRTEENTH INTERNATIONAL CONFERENCE ON CIVIL, STRUCTURAL AND ENVIRONMENTAL ENGINEERING COMPUTING Edited by: B.H.V. Topping and Y. Tsompanakis
Paper 69
Seismic Displacement Control Design of Base Isolated Structures using MagnetoRheological Dampers based on a PseudoComplexDamping Rule M. Ikenaga, K. Ikago and N. Inoue
Graduate School of Engineering, Tohoku University, Sendai, Japan M. Ikenaga, K. Ikago, N. Inoue, "Seismic Displacement Control Design of Base Isolated Structures using MagnetoRheological Dampers based on a PseudoComplexDamping Rule", in B.H.V. Topping, Y. Tsompanakis, (Editors), "Proceedings of the Thirteenth International Conference on Civil, Structural and Environmental Engineering Computing", CivilComp Press, Stirlingshire, UK, Paper 69, 2011. doi:10.4203/ccp.96.69
Keywords: baseisolated structure, displacementdependent damper, magnetorheological damper, pseudocomplexdamping rule, shaking table test, numerical analysis.
Summary
The displacementdependent damper which depends only on the damper displacement was suggested by Sagami et al. [1,2]. They showed that the displacementdependent damper can reduce the maximum damper force compared with a conventional velocitydependent damper in cases where the displacement of the isolation layer is the same. The complex damping is the ideal model for the displacementdependent damper. The complex damping, however, is generally considered in the frequency domain and it is impossible to realize because of the noncausal characteristics. To simulate the complex damping in the time domain, Fujita et al. [3] have presented a new seismic control rule denoted as a variableovalcontrol rule. In this control rule, the semiactive damper is also used. The proposed control rule, however, has nonlinearity and discontinuity in the hysteretic loop.
Ikago and Inoue [4] have presented the pseudocomplexdamping rule as an alternative of the variableovalcontrol. This is a simple control rule to simulate the complex damping theoretically by the active or semiactive dampers. The purpose of this study is to find the feasibility of the displacementdependent damper by the pseudocomplexdamping rule from the experimental and numerical analysis studies. From a series of shaking table tests and numerical analyses for the baseisolated structure, incorporated with the semiactive damper controlled by the pseudocomplexdamping rule in the baseisolated layer, it is shown that the hysteretic behavior of the damper, using the pseudocomplexdamping rule, cannot simulate the ideal displacementdependent damper well because of the simplified assumption for the pseudocomplexdamping rule. In order to improve the pseudocomplexdamping rule, the assumption is revised according to the test results. From a series of numerical analysis, it is shown that the improved pseudocomplexdamping rule can simulate the ideal complex damping to some extent. Still little differences can be found especially in the range of the large displacement, and it is a future challenge to improve this. References
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