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Seismic performance of structures incorporating magnetorheological dampers with pseudo‐NEGATIVE STIFFNESS
Author(s) -
Wu Bin,
Shi Pengfei,
Ou Jinping
Publication year - 2013
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.504
Subject(s) - stiffness , isolator , dissipation , magnetorheological fluid , structural engineering , damper , acceleration , control theory (sociology) , engineering , nonlinear system , displacement (psychology) , physics , computer science , control (management) , classical mechanics , psychology , quantum mechanics , electronic engineering , artificial intelligence , psychotherapist , thermodynamics
SUMMARY Pseudo‐negative stiffness control is a control scheme that is aimed to track, in a passive energy dissipation fashion, a target spring force with negative stiffness when possible. In this study, it is proved that systems with pseudo‐negative stiffness control have the property of homogeneity even though they are nonlinear systems. The harmonic response analyses reveal that the pseudo‐negative stiffness reduces the resonant frequency of the system. Seismic response spectrum analyses show that both acceleration and displacement can be reduced with the pseudo‐negative stiffness control when the structural period is long and damping level is not high. Pseudo‐negative stiffness control of a five‐story base‐isolated structure incorporating magnetorheological damper is studied through analytical and real‐time hybrid test methods. The results show that displacement and acceleration responses with pseudo‐negative stiffness control are lower than those with passive‐off control and isolator alone, whereas the displacement response with pseudo‐negative stiffness is greater than the passive‐on control. Copyright © 2011 John Wiley & Sons, Ltd.