A Study on Modal Coupling Effect for Building with Mid-Story Isolation
|Keywords:||中間樓層隔震結構;動力特性;高模態;模態耦合效應;振動台試驗;mid-story isolation;dynamic characteristic,;higher mode;modal coupling;shaking table test||Issue Date:||2008||Abstract:||
The excellent performance of seismically isolated buildings during the past earthquakes is encouraging for the extensive adoption of the isolation design. Correspondingly, isolation design guidelines have been implemented or refined in various seismic design codes. However, these design guidelines have been provided specifically for the base-isolated structures. For the mid-story isolation design in which the isolation layer is frequently designated at the top of the first or other lower stories of the buildings to facilitate the construction and efficiently utilize the limited site, there indeed exists the difference between the mid-story isolated and the base-isolated buildings such as the flexibility effect of the structure below the isolation layer as well as the interaction of the structures below and above the isolation layer.herefore, for the mid-story isolated structures, a simplified three-lumped-mass structural model is adopted to perform the equivalent linear analysis to appropriately reflect the effect of vibration characteristics of the structures above and below the isolation layer, and to have a better insight on the basic dynamic characteristics in this study. Accordingly, the shaking table tests on the scale-down models were conducted to validate the numerical analysis results. It is concluded that for the mid-story isolated buildings, the participation and the undesired coupling effect of the higher modes should be especially taken into account in the equivalent lateral response design procedure.
|Appears in Collections:||土木工程學系|
Items in DSpace are protected by copyright, with all rights reserved, unless otherwise indicated.