09-15-2012, 09:36 AM
Alternative Approach to Optimal Tuning Parameter of Liquid Column Damper for Seismic Applications
Author: Aparna Ghosh and Biswajit Basu | Size: 0.084 MB | Format: PDF | Quality: Original preprint | Publisher: Journal of Structural Engineering, Vol. 133 Issue 12 | Year: Dec2007 | pages: p1848-1852, 5p | ISBN: 0733-9445
A closed-form solution for the optimum tuning ratio of a liquid column damper (LCD) that is valid for damped structures subjected to generalized seismic loading is presented. The closed-form expression is based on the extension of the theory of “fixed-point” frequencies for a classical undamped structure-mass damper system to damped structure-nonlinear LCD system. For the specific case of white noise input, the values of optimum tuning ratio have been compared with those obtained from a standard expression.
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Seismic Vibration Control of Nonlinear Structures Using the Liquid Column Damper
Author: Aparna Ghosh and Biswajit Basu | Size: 0.67 MB | Format: PDF | Quality: Original preprint | Publisher: Journal of Structural Engineering, Vol. 134 Issue 1 | Year: Jan2008 | pages: p146-153, 8p | ISBN: 0733-9445
A design methodology for a variation of the conventional liquid column damper (LCD) (by attaching a spring connection to the LCD) as a seismic vibration control device for structures with nonlinear behavior has been proposed in this paper. The proposed method with the nonconventional damper has the advantage of being applicable to nonlinear structures having high initial stiffness (short natural period) in the linear range below yield with subsequent period lengthening in the postyield phase, where the conventional LCD would be ineffective. The reason for the lack of effectiveness is not only due to the damper parameters designed for the linear structure becoming inapplicable when the structures move to the inelastic regime but also because of the restriction imposed by the high natural period of the conventional damper on its applicability to comparatively stiff structures (for tuning). The methodology in this paper, thereby incorporating the use of a modified model of the LCD system, namely a spring-connected one, removes the requirement on the natural period of the liquid in the LCD and further, the design is based on the parameters of an equivalent linear system for the nonlinear structure.
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