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中文標題: 平面不對稱建築受震反應之趨勢分析與同形振盪器之開發
英文標題: The Trends in the Seismic Responses of Asymmetrical Buildings and the Development of Co-Shape Oscillators
編號: NCREE-13-005
語言: 英文
編輯:
媒體型式: 紙本
作者:
林瑞良   蔡克銓   莊明介   
中文摘要: 本研究探討在雙向平面不對稱建築受到雙向地震作用下的四個旋轉效應趨勢的原因。研究結果顯示振態平移與振態旋轉之間呈現非比例變形的現象以及振態偏心皆是了解這些旋轉效應趨勢的關鍵點。這些關鍵點是得自於採用三自由度振態系統來代表一個雙向平面不對稱建築的單一一個振態時所自動顯現出來的特性。並且,本研究提出一種可以有效地應用於平面不對稱建築的非線性歷時分析的「同形振盪器」。每一個同形振盪器是由一個剛性質量塊連接兩組彈簧阻尼盒裝置所構成,並且一個同形振盪器恰好可以代表原單向平面不對稱建築的一對振態。與一般僅能夠代表單一一個振態的單自由度振盪器相比較, 同形振盪器兼具有平移與旋轉的運動模式,更符合平面不對稱建築的受震行為。以少數幾個主要的同形振盪器取代多層樓單向平面不對稱建築的有限元素模型進行非線性歷時分析,可以顯著地增進分析的效率。
英文摘要: This research studied the reasons behind the four trends in torsional effects in asymmetric-plan buildings observed in the current literature. It was found that the modal eccentricities and the non-proportionality between the modal translations and the modal rotation are key to understanding these trends in torsional effects in asymmetric-plan buildings. These key points were obtained from the three-degree-of-freedom modal systems, which represent the single vibration mode of a two-way asymmetric-plan building. In addition, this study proposes a novel oscillator, referred to as the co-shape oscillator (COSO), which can be effectively used in the nonlinear response history analysis (NRHA) of multistory asymmetric-plan buildings. Each COSO, consisting of a rigid mass block connected with two spring-dashpot sets, represents a pair of vibration modes of the original multistory asymmetrical building. When compared with the common single-degree-of-freedom (SDOF) oscillator, the COSO with translation-rotation coupled motion is more suitable to represent the motions of asymmetrical buildings. Substituting the governing COSOs for the finite element model of the multistory building substantially improves the efficiency of performing NRHA.
關鍵字: asymmetrical buildings; torsional effects; modal eccentricity; modal coordinate; oscillator; nonlinear response history analysis; spring-dashpot set
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