| Title |
Dynamic Response Characteristics of Isolation Layer and Superstructure Considering Long-period Ground Motions |
| Authors |
김주찬(Kim, Ju-Chan) ; 오상훈(Oh, Sang-Hoon) |
| DOI |
https://doi.org/10.5659/JAIK.2023.39.6.245 |
| Keywords |
Long-period Ground Motion; Seismically Isolated structure; Energy-based Seismic Design; Duration of Strong Motion |
| Abstract |
Seismically isolated structures employ a structural system that incorporates an isolation layer within the building, effectively isolating the
superstructure from ground motions. Typically positioned at the building’s foundation, this isolation layer lengthens the structure's natural
period, thereby reducing the acceleration response of the superstructure. However, concerns arise in seismically isolated structures regarding
the potential for significant displacement of the isolation layer due to long-period ground motion. Furthermore, the amplification of the
long-period component of ground motion by the isolation layer poses a risk of earthquake damage to both the superstructure and the
non-structural components attached to it. Consequently, this study aims to examine the dynamic response characteristics of both the isolation
layer and the superstructure through nonlinear time history analysis, taking into account the influence of long-period ground motions. The
analysis model utilized in this study follows the energy-based seismic design method proposed by Akiyama (1985). The key variables
considered in the analysis include the natural period of the isolation layer, the natural period of the superstructure, and the horizontal yield
strength of the superstructure. |