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Response mitigation of the base isolated benchmark building by semi‐active control with the viscous‐plus‐variable‐friction damping force algorithm
Author(s) -
Ruangrassamee Anat,
Srisamai Weerasit,
Lukkunaprasit Panitan
Publication year - 2006
Publication title -
structural control and health monitoring
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.587
H-Index - 62
eISSN - 1545-2263
pISSN - 1545-2255
DOI - 10.1002/stc.113
Subject(s) - displacement (psychology) , damper , acceleration , magnetorheological fluid , benchmark (surveying) , damping torque , viscous damping , base (topology) , engineering , structural engineering , control theory (sociology) , variable (mathematics) , damping ratio , magnetic damping , mechanics , physics , computer science , mathematics , classical mechanics , acoustics , vibration , mathematical analysis , geology , artificial intelligence , control (management) , geodesy , voltage , psychotherapist , psychology , direct torque control , induction motor , electrical engineering
In this study, the preset damping force algorithm, called the viscous‐plus‐variable‐friction damping force algorithm, was proposed to combine advantageous features of typical viscous and friction dampers. The proposed damping force algorithm can be represented by a viscous element placed in series with a variable‐friction element. When the damping force reaches a peak value of the viscous element or a preset force limit, the sliding of the variable‐friction element occurs, resulting in a constant damping force. The realization of the proposed damping force algorithm by a magnetorheological (MR) damper was investigated. It is found that the algorithm can be achieved with a good accuracy at the excitation frequency of 1 Hz. Then, a series of analyses was conducted on the based‐isolated benchmark building controlled by the damping force algorithm. The benchmark building has eight storeys with elastomeric bearings at the base. The semi‐active dampers whose damping forces are characterized by the proposed damping force algorithm are installed between the base and the foundation. The investigation was done on seven ground motion records. From the analysis, it is found that with use of the damping force algorithm the base displacement can be reduced by 20–50%. The floor acceleration increases by 20% in some ground motion records. Copyright © 2005 John Wiley & Sons, Ltd.