Seismic Analysis of Connected Isolated Building by VF Damper

Abstract eng:
Seismic response of two adjacent buildings, namely ten and eight storeys inter-connected through semi-active VF damper in which ten storeys building being isolated is investigated under unidirectional excitation due to Imperial Valley earthquake. The two adjacent buildings are modelled as linear shear type building whereas damper and isolators are modelled by modified Bouc-Wen and Wen’s model respectively. A friction damper employed is a displacement-dependent energy dissipation device as its force is independent of the velocity and frequency-content of excitation. The performance of seismic response using proposed hybrid control scheme is compared with the semi-active VF control in order to know the effectiveness of the proposed strategy. Further, parametric studies are conducted to study the effects of gain multiplier of damper and isolation damping on the efficacy of proposed hybrid control. It is observed that proposed semi-active hybrid strategies are quite effective in reducing the seismic responses in comparison to semi-active VF control. It is also seen from the parametric study that the performance of the control schemes is influenced by the parameters of the isolator and damper.

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