| 名 | 廖京皇(Ching-Huang Liao) | 電子郵件信箱 | s9311618@cyut.edu.tw | |
| 畢業系所 | 營建工程系碩士班(Department and Graduate Institute of Constrction Engineering) | |||
| 畢業學位 | 碩士(Master) | 畢業時期 | 95學年第1學期 | |
| 論文名稱(中) | 應用改良型基因演算法於實測建築物之識別 | |||
| 論文名稱(英) | Hybrid Genetic Algorithm to Identification of Real Buildings | |||
| 檔案 |
請遵守中華民國著作權法之相關規定，切勿任意重製、散佈、改作、轉貼、播送，以免觸法。 |
論文使用權限 | 校內外完全公開 | |
| 論文語文/頁數 | 中文/194 | |||
| 摘要(中) |
結構物會因於使用期間內遭受地震力、風力等作用，使得材料強度因降伏或疲乏而折減時，導致結構參數設計值與原先設計值有差異，其動力特性亦將因結構受損而改變，所以結構物是否仍然具有當初設計之強度便不得而知。此時若能藉由系統識別的方法來識別結構特性的變化，即可作為對結構物進行修復或補強的參考，並確保人民生命財產之安全。 在過去的研究中，洪忠儀採用結合基因演算法與局部搜尋法之混何運算策略，以彌補基因演算法中缺乏局部搜尋的能力，加強基因演算法的搜尋能力，並減少基因演算法在微調上的計算時間使之能更快的找到最佳解。在此吾人稱之為改良型基因演算法。 本文之主要目的是利用改良型基因演算法在時間域上進行振態參數識別，以探討結構受震時的動力特性。識別的第一種系統為在國家地震工程中心之實體三層樓鋼構架在振動台上以El Centro地震進行振動試驗，將試驗所量測之加速度反應，利用振態識別的原理進行單向擾動系統之振態參數識別，其參數的搜索是經由改良型基因演算法來搜索。 另一種是以實際結構的地震紀錄來進行識別，利用改良型基因演算法並使用振態參數識別法對中興大學土木環工大樓進行振態參數識別，地震紀錄是使用中興大學土木環工大樓於民國八十八年十月二十二日十點十九分的921餘震所蒐集到的地震反應。將中興大學土木環工大樓所量測之加速度反應，利用振態識別的原理進行不考慮扭轉耦合效應之單向擾動與考慮扭轉耦合效應之單向擾動反應為輸出等系統之振態參數識別，其參數的搜索亦經由改良型基因演算法來搜索。經由上述兩個案例，將估測與實測結果作比較，以證明本文之改良型基因演算法確實可應用於實際結構之系 統振態參數識別。 |
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| 摘要(英) |
Structure properties may be deteriorated and degraded with time
in an unexpected way due to randomness in the environment and
loadings over its lifetime. In particular, when a structure is
exposed to strong earthquake, the properties of the structure
may be changed and its behavior after an earthquake can be
different from that before the earthquake. In order to realize
the dynamic behavior of structural systems, we can determine the
dynamic models and parameters by system identification
techniques. Genetic algorithms (GAs) are global search techniques for optimization. However, GAs are inherently slow, and are not good at hill-climbing. To this end, an efficient hybrid Genetic algorithm, which merges the local search method “Gauss-Newton Method” is employed. In this study, the Hybrid Genetic algorithms and spectral analysis techniques are used to identify the modal parameters in the time domain. There are two kinds of systems to be identified. The first one identified is 3-story steel frame built in the National Center Research on Earthquake Engineering and the second one identified is the real building identified is the Civil-Environment Building of Chung-Shin University with torsionally-coupled effect. The modal characteristics of these two systems are real earthquakes. Finally, the estimated parameters enable us to predict the structural response under seismic loading. The comparison is made between the predicted acceleration and the measured one for each case. |
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| 口試日期 | 2007-01-31 | 繳交日期 | 2007-02-27 | |