2025 Volume 17 Issue 1 Pages 10-16
The purpose of this study is to determine the relationship between the accuracy of the estimation of the horizontal stiffness of the seismic isolation layer using the estimation method and the input ground motion. This study focuses on an experiment conducted in 2013 at E-Defense, entitled “Vibration test for developing countermeasures to reduce damage caused by collisions in full-scale seismically isolated buildings”. Two models, a multi-mass system model and a 3D model, were created with reference to the test specimens from this experiment, taking into account nonlinear characteristics. In numerical experiment example 1, a time history response analysis was conducted for each model with only uniaxial ground motion as input. In numerical experiment example 2, a time history response analysis was performed for the 3D model with triaxial ground motion as input. By comparing the results of each analysis with the experimental results of E-Defense, the relationship between the accuracy of the estimation of the horizontal stiffness of the seismic isolation layer by the estimation method and the input ground motion was examined. The results of this study indicate that time response analysis with triaxial ground motion as input is necessary for the practical application of the estimation method of the horizontal stiffness of the seismic isolation layer.
