| 研究生: |
許雅雯 Hsu, Ya-Wen |
|---|---|
| 論文名稱: |
應用類神經網路於結構損傷即時診斷 Application of Artificial Neural Networks for Structural Damage Detection |
| 指導教授: |
姚昭智
Yao, George |
| 學位類別: |
碩士 Master |
| 系所名稱: |
規劃與設計學院 - 建築學系 Department of Architecture |
| 論文出版年: | 2004 |
| 畢業學年度: | 92 |
| 語文別: | 中文 |
| 論文頁數: | 128 |
| 中文關鍵詞: | 類神經網路 、層間位移模態 、結構損傷檢測 |
| 外文關鍵詞: | Structural damage detection, Inter-story Drift Mode Shape, IDMS, Neural networks |
| 相關次數: | 點閱:140 下載:7 |
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本研究主要藉由找出結構地震時明顯的振動改變信號,建立一套有效的結構損傷檢測辦法,以便在大地震後能夠迅速的完成結構損傷檢查,一方面確保震後傑購物之安全,另一方面則能減少安全檢查所花費之時間,使建物能儘快恢復正常使用,減低損失。
文中首先以SAP2000建立電腦模型進行非線性歷時分析,觀察層間位移模態(IDMS)在未破壞前與破壞後之改變。並以計算IDMS靈敏度,比較各種不同之破壞類型,驗證了以IDMS做為破壞指標的可行性。研究發現只要樓層剛度變化在30%以上,便可藉由IDMS之改變得知。接著利用氣象局裝設於建築物上之強震量測系統實際量測資料,進行基線值之計算分析,結果S與SRC建物計算所得之基線值穩定度較高,而RC建物則較差。最後再以IDMS模式實際分析一大陸七層鋼筋混凝土模型震動台試驗數據,得到良好之破壞檢測效果,證明IDMS應用於實際結構之適用性。
本研究第二部分則嘗試應用類神經網路作為損傷檢測之判別工具,利用類神經網路在處理複雜資料及運算速度上的優勢,來判別結構物之損傷樓層及程度。文中以IDMS為網路之輸入層,使用倒傳遞類神經網路來進行訓練與測試,訓練結果證明以類神經網路作為判別工具之效果良好。而後再以高雄某大樓之電腦模型作為實例驗證,並建立一套完整的結構損傷即時診斷流程。
This research intends to identify a structural damage index and to establish a damage diagnosis system to detect building damage after a major earthquake so that the remedial process can be proceeded immediately in the post-earthquake recovery.
In the first part, SAP2000 is used to perform nonlinear time history analysis of plane frame and the space frame structures. Inter-story Drift Mode Shape (IDMS) is chosen as the key index in detecting damage conditions. The variation of IDMS before and during earthquakes is then compared to indicate the existence of the structural damage. Thereafter, the sensitivity of the IDMS variation to different degree of structural damage is also compared. It is concluded that IDMS is adequate to identify structural damage condition in which the floor stiffness is reduced above 30%. Additionally, the dynamic characteristics records of the existing building arrays instruments installed by the Central Weather Bureau in Taiwan are utilized to calculate the baselines of different buildings. It is found that baselines of S and SRC buildings are more accurate than that of RC buildings. In conclusion, the results obtained by using IDMS to analyze a shaking table test study of RC frame model show that the application of IDMS for damage detection is satisfactory.
Secondly, according to the superiority in coping with complex data and operation speed, we try to apply the artificial neural networks (ANNs) to identify the structural damage. IDMS is used as the input data in this case to train and test a back-propagation neural network. The training reveal that ANNs is effective to be a damage assessment technique for the diagnosis of structures. Using the computer model of an existing structure located in Kaohsiung has been proved that the network can discover the damage successfully. Meanwhile, establishing an integrated process to diagnose damage immediately by using IDMS and ANNs.
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