Journal Title
Title of Journal: Earthq Eng Eng Vib
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Abbravation: Earthquake Engineering and Engineering Vibration
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Publisher
Institute of Engineering Mechanics, China Earthquake Administration
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Authors: V R Panchal R S Jangid
Publish Date: 2008/07/02
Volume: 7, Issue: 2, Pages: 193-205
Abstract
Earthquake performance of a flexible onestory building isolated with a variable frequency pendulum isolator VFPI under nearfault and farfield ground motions is investigated The frictional forces mobilized at the interface of the VFPI are assumed to be velocity dependent The interaction between frictional forces of the VFPI in two horizontal directions is duly considered and coupled differential equations of motion of the isolated system in the incremental form are solved iteratively The response of the system with bidirectional interaction is compared with those without interaction In addition the effects of velocity dependence on the response of the isolated system are also investigated Moreover a parametric study is carried out to critically examine the influence of important parameters on bidirectional interaction effects of the frictional forces of the VFPI These parameters are the superstructure time period frequency variation factor FVF and friction coefficient of the VFPI From the above investigations it is observed that the dependence of the friction coefficient on relative velocity of the system does not have a noticeable effect on the peak response of the system isolated with VFPI and that the bidirectional interaction of frictional forces of the VFPI is important and if neglected isolator displacements will be underestimated and the superstructure acceleration and base shear will be overestimated
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