Seismic Behavior of Building with Mid-story Isolation
Date Issued
2007
Date
2007
Author(s)
Chiang, Chun-Chin
DOI
zh-TW
Abstract
In view of the mature technology and proved effectiveness published in many researches, as well as learning from the satisfactory performance of structures with seismic isolators during the 1994 Northridge earthquake in California and 1995 Kobe earthquake in Japan, the applications of seismic isolation systems to enhance the earthquake-resistant capability of buildings have become extensive worldwide. In Taiwan, it is particularly worthy of noting that more and more cases of the so-called “mid-story isolation”, which is different from the traditional “base isolation” and is used commonly in Japan, can be anticipated due to the high popularity and limited land. However, there are very few studies regarding the “mid-story isolation” structures currently. The purpose of this research is to derive 3 degree-of-freedom simplified model (superstructure, isolated layer, and substructure), estimate the effect of the parameters of interest on the seismic responses, and finally address the recommendations and special concerns for the practical engineering applications of the “mid-story isolation”.
To avoid the effect of diverse ground motions in this study, 7 sets of earthquake histories recorded at TCU059, TCU061, TCU072, TCU074, TCU078, TCU079, and TCU109 in the 1999 Chi-Chi earthquake are used to be compatible with the domestic seismic design spectrum. Both the response spectrum and response history analyses are performed not only to study the effect of the parameters but also to validate the feasibility of the application of the “mid-story isolation” to increasing the floor space of the National Center for Research on Earthquake Engineering (NCREE). In addition to the effect of the parameters, the “modal coupling effect” is also remarkable and should be paid more attention.
The test study based on the proposed analytical results will be conducted in the near future. After the validation of the experiment, it must be more beneficial for the practical engineering application.
Subjects
中間層隔震
連成作用
頻率比
質量比
設計相符地震紀錄
mid-story isolation
modal coupling effect
frequence ratio
mass ratio
compatible time history
Type
thesis
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