| 研究生: |
蔡宗憲 Cai, Zong-Sian |
|---|---|
| 論文名稱: |
剪力型屋架部份量測之樓層側向勁度識別 Identification on Story Lateral Stiffnesses of Shear Buildings with Partial Measurements |
| 指導教授: |
洪李陵
Hong, Li-Ling |
| 學位類別: |
碩士 Master |
| 系所名稱: |
工學院 - 土木工程學系 Department of Civil Engineering |
| 論文出版年: | 2011 |
| 畢業學年度: | 99 |
| 語文別: | 中文 |
| 論文頁數: | 162 |
| 中文關鍵詞: | 部份量測 、振態參數 、樓層參數 、識別 |
| 外文關鍵詞: | incomplete measurement, modal parameter, story parameter, identify |
| 相關次數: | 點閱:135 下載:1 |
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建築物於強震作用下,造成內部構件損壞,樓層側向勁度值為損壞程度評估之重要指標。藉由輸入與輸出歷時可推估振動系統之振態參數,於完全量測下,振態參數轉換為樓層參數的識別精度佳;於部份量測下,各樓層參數難以由振態參數反算之。振態參數的個數多於樓層參數,除非振態參數的識別十分精確,否則反算樓層參數難以相信。本研究經由數學推導,將最高樓的各振態有效參與係數以振態頻率組合之,以提升振態向量的識別精度,反算之樓層參數當作時間域識別之初使值,可增加部份量測下的樓層參數識別精度。使用模式和方法以數值模擬之反應之識別結果驗證後,進行標竿結構一系列試驗以及實際建築物一連串事件之樓層側向進度識別和損壞度評估。
When a building is subjected to a strong earthquake excitation, it may cause damage of internal structural elements. The story lateral stiffness is an important index to assess the damage severity. The modal parameters of systems could be identified by using the input and output signals. For cases of complete measurement, the calculated results of story parameters based on identified modal parameters are much better. For cases of incomplete measurement, however story parameters are difficult to obtain from modal parameters. The number of modal parameters is always more than that of story parameters. Hence, the calculated story parameters are not convinced unless the identified modal parameters are very accurate. Through mathematic derivation for shear building, the effective participation factors at the roof floor can be determined by modal frequencies. The accuracy of modal vectors identified in frequency domain is increased when these formulae are applied, and so is the accuracy of story parameters identified in time domain with initial guesses obtained from those modal parameters. Many cases of simulation data are tested to verify such methodology. Final applications include the identification of story lateral stiffness and the damage assessment for a benchmark model under a series of tests and a real building attacked by several events.
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