Please use this identifier to cite or link to this item: `http://hdl.handle.net/11455/13707`
 標題: 扭轉耦合結構之系統識別與調諧質量阻尼器之最佳設計System Identification and Optimal Design of Tuned Mass Dampers for Torsionally-Coupled Structures 作者: 林保隆Lung, Lin Poal 關鍵字: Torsionally-Coupled;扭轉耦合 出版社: 土木工程研究所 摘要: 裝設主/被動結構振動控制系統以降低結構受強烈外力(如風或地震等)作 用下之動態反應，已引起國內外學術界與工程界的研究興趣。對於新建結 構，應用振動控制理論配合傳統耐震設計將可達到更經濟之目標；而對於 現存耐震能力不足的結構，裝設振動控制系統亦可達到補強的目的。無論 新舊結構欲裝設振動控制裝置，均需了解原主結構之動態特性，方能進行 振動控制裝置之最佳設計。而實際結構由於質心與剛心位置不一致，其振 動反應具有扭轉耦合效應，欲了解此類結構之真實動態特性，利用實際結 構振動量測進行系統參數識別是最佳且最可行的途徑，故系統識別配合振 動控制十分重要。本文探討扭轉耦合結構裝設調諧質量阻尼器之最佳設計 與其系統識別。應用一套結構系統識別技巧，不需要量測結構系統之受力 ，僅依據部份反應量測即可計算出扭轉耦合結構完整的模態參數。首先， 應用隨機遞減法化簡量測反應以萃取該量測位置由於起始位移所引致之自 由振動反應，進而依亞伯拉罕時域模態參數識別法計算結構之模態頻率、 阻尼比以及振態；因量測不足，故本文提出一振態插值法以求得未量測位 址之振態值。同時，應用所識別的主結構模態頻率、阻尼比以及振態，進 而計算調諧質量阻尼器之最佳設計參數。本文以五層扭轉耦合剪力樓房結 構為例，驗證系統識別技巧之準確性；並以裝設單一或二個調諧質量阻尼 器之單層扭轉耦合剪力樓房結構驗證本文所發展之調諧質量阻尼器的振動 控制效用。The use of active and passive control devices such as Tuned Mass Damper (TMD) has become an area of considerable research interest recently. It is gaining more acceptance not only for the design of new structures but also for the retrofit of existing structures to improve structural safety. Designing an optimum TMD requires the prior knowledge of modal properties of the controlled structure. For a real building structure, the lateral and torsional motions are coupled if the centers of mass and resistance do not coincide. Therefore,it is of great importance that system identification of torsionally-coupled buildings using real response measurements be carried out in conjunction with the design of optimal TMDs. In this study, an optimum design procedure and system identification technique are developed to evaluate the modal parameters of a torsionally- coupled structure with TMD based only on partial response measurements. First, a random decrement method is employed to reduce the measured response data to extract free vibration responses at each measured location. Then, the Ibrahim time domain technique is applied to calculate the modal parameters. To obtain the complete mode shapes, an interpolation method is also developed to calculate the mode shape value for the locations without measurement. Based on the identified modal parameters, an optimum TMD is determined. Numerical example of a five-story torsionally-coupled building shows that the proposed system identification technique is able to identify structural dominant modal parameters and responses accurately even with small number of measurements. In addition, a single story torsionally-coupled building with one or two optimal TMDs is used to verify that the proposed optimum TMD can reduce the building responses significantly. URI: http://hdl.handle.net/11455/13707 Appears in Collections: 土木工程學系所

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