| 英文摘要 |
In a mid-story isolated building, the isolation system is incorporated into the mid-story rather than the base of the building. In this study, the dynamic characteristics and seismic responses of mid-story isolated buildings were investigated using a simplified three-lumped-mass structural model for which equivalent linear properties were formulated. Moreover, the adverse effect arising from the coupling of higher modes on the seismic responses of a mid-story isolated building was clarified. A simple method to guarantee the mid-story isolation design against the coupling of higher modes attributed to the improper design of the substructure and superstructure was deduced and is presented in this report. Besides, the structural models with their isolation system located at the base and other stories were fabricated and tested to investigate the discrepancies between the seismic responses of base-isolated and mid-story isolated buildings. Based on the analytical and test results, the irrationalities of adopting the equivalent lateral force procedure for the mid-story isolation design are discussed. The most rigorous situation for the displacement demand of the isolation system should be carefully considered and will be further studied. |
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