Random response analysis of adjacent structures connected by viscous damper

Abstract

The response of two adjacent single degree-of-freedom (SDOF) structures connected by viscous damper under base excitation, modeled as nonstationary random process is investigated. To study the effect of amplitude non-stationary characteristics of earthquake excitation, the ground motion is modeled as a uniformly modulated stationary Gaussian random process with zeromean. The non-stationary response of coupled structure is obtained for modulating function stationary response. The peak value of root mean square (RMS) response of the connected structures for other model of earthquake excitation such as Kanai- Tajimi and white noise is compared for stationary and tow non-stationary conditions.It is observed that stationary response is achieved in a very short time. The peak value of RMS response under non-stationary ground motion is nearly same as that of the stationary response. The result indicates that the peak value of responses for stationary and two non-stationary cases is quite comparable with each other. Thus, the random response of coupled structure can be obtained by considering stationary model of earthquake ground motion.