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標題: | 應用Bouc-Wen模式進行中間層隔震建築物之系統識別 System Identification of a Building with Mid-Floor Seismic Isolation Using Bouc-Wen Model |
作者: | Bo-Tsang Wu 吳柏蒼 |
指導教授: | 田堯彰 |
關鍵字: | 系統識別,中間層隔震建築物,輸出誤差法,Bouc-Wen模式, System Identification,Building of Mid-Story Isolation,Output-Error Method,Bouc-Wen Modal, |
出版年 : | 2011 |
學位: | 碩士 |
摘要: | 本文建立一個中間層隔震建築的分析模式與其識別流程。希望以一簡化的模型,識別出其中具有意義的參數。本文中以集中質量的方式,將一中間層隔震建築物簡化成四個自由度的模型;這些自由度分別為上部結構長向位移、隔震層長向位移、下部結構長向位移與等值基礎長向位移。在上部結構的部分採用等效線型模態質量法,將隔震層以上的多自由度轉換成一個單自由度的系統;在分析時,假設上部結構與下部結構之力學反應為線性,而裝設在隔震層的鉛心橡膠支承墊(LRB)的行為則為一非線性反應,依循Bouc-Wen描述出其反應。在等值基礎部分,為描述土壤與結構物互制之反應則藉由土壤彈簧法將土壤與結構物之間的阻抗簡化為一彈簧與阻尼,並假設其反應為一非線性反應。在識別參數上,利用輸出誤差法(Output-error method)在個別自由度處,用以識別出上部結構、下部結構、隔震層Bouc-Wen模式與等值基礎之參數。
在數值範例部分,各自由度的質量、勁度、阻尼參數依據土木新館結構計算書自行估算,並且利用狀態空間法(Stace Spacement),以TAP089EW921之地表加速度當作輸入,求得各自由度反應,並依此反應作為量測資料加以識別,以此數值範例作為驗證此模型的正確性與系統識別流程的合理性。 最後,在實例識別部分,藉由台灣大學土木工程學系暨研究所新建大樓結構物強震監測系統裝設計畫所取得的歷時資料作為量測值進行分析,配合適當的基線修正法,將量測之誤差修正程合理的反應,求取各自由度之勁度與阻尼參數;並且探討真實情況下產生誤差之原因。最後將量測值之歷時反應與識別值之歷時反應計算其誤差指標,以驗證其可靠性。 This thesis constructs a system identification procedure of building with mid-story isolation , expecting to identify physical parameters of a building with a simplified modal. We used lump mass method, simplifying a building with mid-story isolation into a four degree of freedom system. These degrees of freedom are superstructure, floor above isolation system, substructure and equivalent foundation. For the superstructure, concepts of effective modal mass and effective modal height are adopted to simplify multiple degree of freedom to single degree of freedom. Linear mechanical behavior is assumed in superstructure and substructure; nonlinear mechanical behavior is assumed in isolation story, following the Bouc-Wen modal. Besides, in equivalent foundation part, to describe the soil structure interaction system with the Soil Spring Method. Soil and structure is a simplified impedance between the spring and damping, and assume that the reaction is a non-linear response. We used Output-error method to identify superstructure’ s, substructure’s , Bouc-Wen modal in floor above isolation’s and equivalent foundation’s parameters. In numerical example, we considered structural calculation to evaluate four degree of freedoms’ stiffness and damping, and we input TAP089EW921 to state spacement to calculate the response of all degree of freedom. We used the response to identify the parameters. By numerical example, we hope to improve the accurate of the modal and the reasonable of the procedure. Finally, the reliability of present procedure was verified by calculating the error index between the measured data and identified results from new Civil Engineering Building at NTU |
URI: | http://tdr.lib.ntu.edu.tw/jspui/handle/123456789/30396 |
全文授權: | 有償授權 |
顯示於系所單位: | 土木工程學系 |
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