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標題: | 考慮近斷層脈衝影響及地震雙向作用之鉛心橡膠隔震系統設計程序 Design Procedure for Base Isolation Systems with Lead-Rubber-Bearing Subjected to Bidirectional Excitations of Pulse-Like Ground Motions |
作者: | 宋柏賢 Po-Hsien Sung |
指導教授: | 黃尹男 Yin-Nan Huang |
關鍵字: | 脈衝型地震,雙向地震,隔震,鉛心橡膠支承,等效線性法, Pulse-Like Ground Motion,Bidirectional Ground Motion,Base Isolation,Lead-Rubber-Bearing,Equivalent Linear Method, |
出版年 : | 2023 |
學位: | 碩士 |
摘要: | 脈衝型地震中含有中長週期速度脈衝,可能造成隔震器位移過大而破壞,已然對隔震結構帶來威脅,然而我國現行耐震設計規範並未具體提供考量脈衝型地震之隔震系統設計流程;另外,目前設計時大多僅考慮單向地震輸入,然而在真實情況的水平雙向地震輸入下,隔震位移需求通常會更大,故地震雙向效應亦需被考慮。故本研究欲提出一套考慮近斷層脈衝影響及地震雙向作用之鉛心橡膠隔震系統設計程序,並提供一簡易並可靠的方法(等效線性法)用於初步評估與設計,以減少非線性動力歷時分析(NRHA)次數。
本研究使用NGA West2資料庫和台灣地震紀錄資料庫,進行地震紀錄之縮放與挑選,並建立了本研究之脈衝型與非脈衝型地震資料庫;接著將資料庫中的地震以4個不同大小等級輸入至21個不同參數組合(包含3種不同的Qd、αd及ξd)之單自由度鉛心橡膠隔震系統,進行單向及雙向地震輸入之NRHA、AASHTO(2010)建議之等效線性法、無B值之等效線性法的分析,以探討地震雙向作用的影響以及以等效線性法評估單向NRHA位移之準確性,並發現對於隔震器此類高度非線性系統,若利用單一反應譜進行設計,可能會忽略地震紀錄間的個別差異(record-to-record variability)對於位移反應的影響。本研究根據上述結果,提出了一套考慮近斷層脈衝影響及地震雙向作用之鉛心橡膠隔震系統設計程序,最後以一棟位於台北二區之十五層樓鉛心橡膠隔震結構案例,搭配脈衝週期TP與隔震週期Teff相近之脈衝型地震來驗證及示範此設計流程。 Pulse-like ground motions (PLGM), containing medium or long-period velocity pulses, may cause excessive displacement or damage of the isolator, which poses a threat to isolated structures. However, Taiwanese seismic design code does not provide a specific design procedure for isolation systems subjected to PLGMs. Moreover, most of the current design only considers unidirectional ground motions input, but the displacement demand is usually greater under real situation of horizontal bidirectional ground motions input, so the effect of bidirectional ground motions should be considered. This thesis aims to propose a design procedure for base isolation systems subjected to bidirectional excitations of PLGMs, with a simplified method (equivalent linear method, EL) to reduce the time of nonlinear response history analysis (NRHA). First, non-PLGM and PLGM databases were established by using the subset of PEER NGA West2 database and SSHAC database of NCREE Taiwan, with some criteria adopted in the scaling and selecting process. Afterwards, this thesis evaluated the accuracy and efficacy of EL method, and the effect of bidirectional ground motions, using 21 SDOF models of LRB system, which consist of three kinds of Qd, αd, and ξd, to perform NRHA with uni and bi-directional ground motion input, EL method specified in AASHTO(2010), and EL method without B factor under 4 different levels of non-PLGMs and PLGMs in the databases. Then, a procedure for designing LRB systems subjected to bidirectional excitations of PLGMs was proposed. Last, a validation process for the proposed procedure was performed by using a 15-story steel special moment resisting frame isolated with LRB located in Taipei Basin Zone 2. |
URI: | http://tdr.lib.ntu.edu.tw/jspui/handle/123456789/91555 |
DOI: | 10.6342/NTU202302495 |
全文授權: | 同意授權(限校園內公開) |
顯示於系所單位: | 土木工程學系 |
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