Non-linear Dynamic Analysis and Application of TMD in Controlling Vibration of Building Structures

Abstract

The current trend in construction industry demands taller structure which are flexible in nature and now a days industry concentrates on lighter structures as well with lower value of structural damping. Those structures can easily fail or unserviceable under the effect of earthquake and wind. So, it is very essential to find some remedy and therefore a number of techniques are available today to decrease the vibrational response of the building. Among all the techniques use of TMD is favorable one for tall structures because base isolation is not efficient for taller ones. Generally, we consider the linear models of shear buildings to study the response but those linear models can’t give us idea about the yielding, time when structures enter into linear to nonlinear state, energy dissipation in yielding, etc. which are very important characteristics to understand the behavior of the structure under seismic excitation. In this study earthquakes of different frequency contents are applied to check the effectiveness of the TMD in controlling the vibration. Fast Fourier Transformation (FFT) has been performed to get predominant frequency and other important frequency content parameters. A comparable study has done considering three important parameters PGA, duration of the ground motion and different frequency contents. Linear as well as nonlinear models are considered in this study. Response spectrum of different frequency earthquakes are plotted to understand the peak of the responses vary with different frequency earthquakes.
From this study it is observed that above considered earthquake parameters plays a very important role in the response of different linear and nonlinear structures and TMD can be effectively installed over those structures to control the vibrational response for different parameters of TMD.