Tuned Mass Dampers (TMD) provide an effective technique for vibration control of flexible structures, where base isolation technique is not suitable. However, due to the constant time-period of conventional TMD, they are not usually suitable for aseismic design. The authors have recently proposed a new isolation device, known as Variable Frequency Pendulum Isolator (VFPI) that is also effective for vibration control of structures with wide-band excitations. The VFPI incorporate isolation with both restoring mechanism and energy dissipation. In the present paper, the VFPI are proposed as effective TMD for tall structures. Due to variable frequency of VFPI, they can remain effective even when the structure fundamental frequency changes with response level. The investigations show that TMD using VFPI is more effective than traditional TMD with constant frequency dampers.
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