中間樓層隔震建築之耐震行為研究

Abstract

隨著隔震技術漸趨成熟，除了基底隔震建築物外，配合基地條件及外在因素，中間層隔震建築物亦逐漸為業主、建築師及結構技師所採用，尤以如台灣這種地狹人稠以及高密度都市開發為最，目前國內已有不少建物採用中間層隔震設計，隔震層設計於一樓柱頂。然而對於中間層隔震建築物，國內外均較少提及相關之研究，且國內設計時僅特別考慮隔震層下方結構之勁度要求，其可行性仍待評估。本論文主要研究中間樓層隔震建築物之耐震行為，探討中間樓層隔震建築物之可行性，以及設計時是否有其他不同於基底隔震之特殊考量，以作為欲興建中間樓層隔震建築物時，提供較為有效評估其耐震行為與可行性之方法。 本文以中間樓層隔震建築之耐震行為做分析理論研究，輔以反應譜擬靜力法，配合隔震建築規範所建議之最新修訂建築物耐震設計規範之七組符合設計水平加速度反應譜之地震歷時取其分析之平均值，並舉一設計實例進行可行性之驗證，且利用SAP2000之加速度線性歷時分析(模態分析)與非線性歷時分析 (逐步歷時分析)法，做一對照比較，以針對連成作用加以分析探討。 本論文利用不同參數分析所建立之圖表相互對照，可求得所需之最大位移、層間位移及最大加速度等動力反應，並歸納出在不同參數下之趨勢，相信對於未來中間層隔震建築之初步分析與設計，必有相當大之助益。

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.