Velocity adjustable TMD and numerical simulation of seismic performance
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Qin Li (ÇØ Àö), Zhou Xiyuan (ÖÜÎýÔª) and Yan Weiming (ãÆάÃ÷)
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Beijing Key Lab of Earthquake Engineering and Structural Retrofit, Beijing
University of Technology, Beijing 100022, China
Abstract: A new type of velocity adjustable tuned
mass damper (TMD) consisting of impulse generators and clutches is presented.
The force impulse is generated by a joining operation of electromagnets and
springs and MR dampers are used as clutches. Rules for velocity adjustment are
established according to the working mechanism of TMD. The analysis program is
developed on a VB platform. Seismic response of SDOF structures with both
passive TMD and velocity adjustable TMD are analyzed. The results show that (1)
the control effectiveness of passive TMDs is usually unstable; (2) the control
effectiveness of the proposed semi-active TMDs is much better than passive TMDs
under typical seismic ground motions; and (3) unlike the passive TMD system, the
proposed velocity adjustable TMDs exhibit good control effectiveness even when
the primary structure performance becomes inelastic during severe earthquakes.
Keywords: velocity adjustable TMD; passive TMDs;
MR damper; seismic control; control effectiveness
