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中文標題: 高樓及不規則結構之側推分析方法
英文標題: A Pushover Seismic Evaluation Method for Tall and Asymmetric Buildings
編號: NCREE-12-019
語言: 中文
編輯:
媒體型式: 紙本
作者:
蕭輔沛   蔡優光   歐昱辰   
中文摘要: 側推分析方法對於對稱或低矮型建築具有簡易使用與高精確性的優點,現已被廣泛運用在性能設計以及耐震評估當中。惟高樓層及不對稱形建築物分別在立面與平面上,具有高模態效應顯著的特性,傳統側推分析方法對於此類建築物易有較大誤差。因此,本文旨在提出一套改良式側推分析方法,其可同時考量模態與質量參與係數以獲得新側力分布,並採用非線性反應譜分析所得到的修正參數,修正傳統側推分析所得結果。本文並以14層樓鋼筋混凝土建築物為案例,比較本文建議方法與非線性反應譜分析方法、N2方法以及改良式N2方法之差異性,以驗證所建議方法之合理性,其驗證比較係採用頂層位移及層間變位等參數。由結果可知,本文所建議之方法可合理評估高樓層或不對稱建築之耐震反應。

英文摘要: Pushover analysis (PO) is a well known method both for performance based design and for evaluation purpose since its simplicity and accuracy towards symmetric and short building seismic demands. The conventional PO cannot come up with the higher mode effects both in elevation and in plan (torsional effect) for tall and asymmetric building, respectively. Moreover, the conventional PO requires iteration process to get the target displacement. This research studies on advanced pushover analysis, which combines modal and mass participation factor to get new lateral load pattern, uses the inelastic spectra to get the target displacement, and uses coefficients which are established based on the study on the on real behavior of the buildings which is represented by nonlinear response history analysis (NRHA). The NRHA, basic N2, and extended N2 method are generated in a 14-storey RC building to check the accuracy of this proposed method. Displacement and inter-storey drift both in center of mass and flexible edge are used as the parameter to verify the accuracy of proposed method. The result indicates that the proposed method can predict well the seismic demand of asymmetric and tall building.
關鍵字: 側推分析,不對稱建築,高樓建築,高模態效應
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