Abstract
The frictional behaviour is effective for dissipating seismic energy. Therefore, in recent years, the installation of a frictional isolator in industrial facilities has been investigated. However, the seismic response of the friction system is obtained only by non-linear time history analysis. A great deal of time is required for non-linear analysis. The present study deals with the easy estimation of seismic response for a multi-dof system with friction. In the previous study, the authors suggested the easy estimation of the seismic response of a 1-dof friction system using a friction response spectrum. In addition, the modal analysis method for a 2-dof friction system when the mass ratio of the structure by support is nearly zero was proposed. First, the present paper proposed the estimation method of a seismic response for a 2-dof friction system based on a friction response spectrum and modal analysis method. Secondly, the applicable range of the proposed method is suggested by comparison with the result of non-linear time history analysis. The proposed method can obtain the seismic response of a 2-dof friction system immediately without non-linear time history analysis.
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