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| DC 欄位 | 值 | 語言 |
|---|---|---|
| dc.contributor.advisor | 羅俊雄 | |
| dc.contributor.author | Ting-Yu Hsu | en |
| dc.contributor.author | 許丁友 | zh_TW |
| dc.date.accessioned | 2021-05-20T21:19:13Z | - |
| dc.date.available | 2013-01-17 | |
| dc.date.available | 2021-05-20T21:19:13Z | - |
| dc.date.copyright | 2011-01-17 | |
| dc.date.issued | 2010 | |
| dc.date.submitted | 2010-12-28 | |
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| dc.identifier.uri | http://tdr.lib.ntu.edu.tw/jspui/handle/123456789/10312 | - |
| dc.description.abstract | 本論文之目標在於發展可偵測土木結構損壞位置與損壞程度的方法，並考慮結構受到環境的非線性影響。本論文所欲偵測之結構損壞係指結構勁度折減之情形。
本論文改進「模態應變能改變法」(modal strain energy change method)，以克服其應用於三維鋼構建築結構所遭遇之困難，改進的部分包括：(1) 於識別方程式中加入特徵值與模態應變能改變之關係，以增加求解識別方程式之數值穩定性；(2) 由偵測「桿件概損程度」擴充至「桿件斷面性質概損程度」；(3) 於每步迭代時根據上一步之結果更新迭代之目標；(4) 利用未取絕對值之模態應變能變化來決定可能的損壞桿件；(5) 利用動力擴展法來擴展自由度不完全之模態形狀；(6) 藉由設置門檻值避免桿件模態應變能過低造成之數值問題。改進後之模態應變能改變法係利用上述三維鋼構建築結構之數值案例與實驗案例進行驗證。 本論文提出「頻率響應函數變化法」(frequency response function change method)來偵測結構損壞的位置與程度，該法須使用的資訊包括結構破壞前受地表激振下之頻率響應函數、破壞後受地表激振下之頻率響應函數，以及結構破壞前之系統矩陣。頻率響應函數變化法係利用六層鋼構建築結構之數值案例與實驗案例進行驗證。 此外，本論文將頻率響應函數變化法與無線感測系統進行整合。將頻率響應函數變化法所需之演算法植入無線感測元件，發揮無線感測系統分散運算之優勢，同時大幅節省無線感測元件之耗電量。此一透過無線感測系統之線上(on-line)自動化偵測損壞位置與損壞程度的概念，已成功應用於上述六層樓鋼構建築結構之實驗案例。 本論文亦探討「局部柔度法」(local flexibility method)應用於建築結構損壞偵測之可行性，其應用案例包括低樓層剪力型建築與高樓層柔性建築之數值模型及上述六層樓鋼構建築結構之實驗案例。此外，亦比較運用兩種不同演算法所得之柔度矩陣於局部柔度法損壞偵測之結果。 在工程實務上，結構損壞偵測必須克服環境影響而造成的困難，因此本論文提出一處理識別之桿件損壞程度受到環境影響的方法，並強調可在不量測環境變數下處理非線性的環境影響。該法係藉由訓練自相關類神經網路(auto-associative neural network)來進行非線性主成分分析(nonlinear principal component analysis)，以萃取環境變數的影響方式。之後，藉由所提出之預測模式可更精確的識別桿件損壞程度。 | zh_TW |
| dc.description.provenance | Made available in DSpace on 2021-05-20T21:19:13Z (GMT). No. of bitstreams: 1 ntu-99-D93521024-1.pdf: 2026690 bytes, checksum: 7151a28ab94cc7d2a20c4af46e8d2e6e (MD5) Previous issue date: 2010 | en |
| dc.description.tableofcontents | 口試委員會審定書 I
ACKNOLEDGEMENTS II ABSTRACT III 中文摘要 V CONTENTS VII LIST OF TABLES X LIST OF FIGURES XII 1. INTRODUCTION 1 1.1. Damage Detection of Civil Structures 2 1.2. Environmental Effects in Civil Infrastructure 3 1.3. Classification of Vibration-based Damage Detection Techniques 5 1.4. State-of-the-art of Vibration-based Damage Detection Techniques 7 1.4.1. Methods Based on MSE 8 1.4.2. Methods Based on FRF 9 1.4.3. Methods Based on Dynamic Flexibility Matrix 11 1.4.4. Methods Treating Environmental Effects 12 1.5. Remaining Challenges 14 1.6. Focus and Outline of the Thesis 16 2. MODAL IDENTIFICATION TECHNIQUES 20 2.1. Data-Driven Subspace Identification Technique 21 2.1.1. Stochastic Subspace Identification 22 2.1.2. Combined Deterministic - Stochastic Subspace Identification 26 2.1.3. Determining Stiffness and Damping Matrices 30 2.1.4. Determining Flexibility Matrices 32 2.2. Linking Experimental and Analytical Data 35 2.2.1. Modal Assurance Criterion 35 2.2.2. Mean Phase Deviation 35 2.2.3. Expansion and Reduction 38 2.2.3.1. Static and Dynamic Expansion and Reduction 38 2.2.3.2. System Equivalent Reduction and Expansion Process 39 3. DAMAGE DETECTION METHODOLOGY 40 3.1. Modal Strain Energy Change Method 41 3.1.1. Original Modal Strain Energy Change Method 41 3.1.1.1. Damage Localization 41 3.1.1.2. Damage Quantification 42 3.1.2. Modified Modal Strain Energy Change Method 44 3.1.2.1. Modification for Damage Localization 44 3.1.2.2. Including Sensitivity of Eigenvalue 45 3.1.2.3. Expansion of Element Stiffness 46 3.1.2.4. Iteration Process 48 3.1.2.5. Convergence Criterion 50 3.2. Frequency Response Function Change Method 50 3.2.1. Methodology 51 3.2.2. Integrated with wireless sensing systems 57 3.3. Local Flexibility Method 60 3.3.1. General Principle 61 3.3.2. Application to Bending Stiffness of Beam Structures 63 4. VERIFICATION OF DAMAGE DETECTION METHODOLOGY 66 4.1. Modal Strain Energy Change Method 66 4.1.1. Target Structure Description 67 4.1.1.1. Experimental Setup 67 4.1.1.2. Identified Modal Parameters of the Target Structure 70 4.1.1.3. FE Model of the Target Structure 71 4.1.2. Numerical Validation 72 4.1.2.1. Preliminary Study on MSECR 73 4.1.2.2. Preliminary Study on Modal Expansion Methods 75 4.1.2.3. Preliminary Study on a 3D Frame Structure for MSECR 77 4.1.2.4. Comparison between Original and Modified MSEC Method 79 4.1.2.5. Comparison between Original and Modified Iteration Process 84 4.1.2.6. Study of the Effect Caused by Modal Expansion with Limited Measurement of the Target Structure 86 4.1.3. Experimental Validation 89 4.1.3.1. Modified MSEC Method 89 4.1.3.2. Original MSEC Method 93 4.2. Frequency Response Function Change Method 96 4.2.1. Numerical Validation 96 4.2.1.1. Test Structure Description 96 4.2.1.2. Effects of Measurement Noise 97 4.2.1.3. Effects of Modeling Error 100 4.2.2. Experimental Validation 103 4.2.2.1. Test Structure Description 103 4.2.2.2. Damage Cases 105 4.2.2.3. Excitation and Measurement 106 4.2.2.4. Data Preparing for FRFC Method 107 4.2.2.5. Damage Detection Results of FRFC Method 109 4.2.3. Experimental Validation of Integration with Wireless sensing systems 111 4.2.3.1. Wireless Sensing Unit 111 4.2.3.2. Experimental Setup 113 4.2.3.3. Imbedded Algorithms in the Wireless Sensing Unit 115 4.2.3.4. Quality of the Wireless Sensor Data 116 4.2.3.5. Damage Detection Results of FRFC Method Integrated with WSU 118 4.2.3.6. Energy Efficiencies Gained from Integrating FRFC Method with WSS 120 4.3. Local Flexibility Method 124 4.3.1. Numerical Validation 124 4.3.1.1. A 6-story shear building 124 4.3.1.2. A 50-story flexible building 126 4.3.2. Experimental Validation 128 5. DAMAGE DETECTION ACCOMMODATING NONLINEAR ENVIRONMENTAL EFFECTS 142 5.1. Methodology 143 5.1.1. Nonlinear Principal Component Analysis 143 5.1.2. Prediction Model 146 5.2. Numerical Validation 148 5.2.1. The Identification Model 148 5.2.2. Synthetic Environmental Effects 149 5.2.3. Damage Cases 149 5.2.4. Numerical Results 151 6. CONCLUSIONS AND FUTURE WORKS 154 6.1. Conclusions 154 6.2. Future work 159 REFERENCE 161 CURRICULUM VITAE 166 | |
| dc.language.iso | en | |
| dc.title | 土木基礎結構損壞偵測技術:含非線性環境影響之考慮 | zh_TW |
| dc.title | Damage Detection of Civil Infrastructures
Including Treatment of Nonlinear Environmental Effects | en |
| dc.type | Thesis | |
| dc.date.schoolyear | 99-1 | |
| dc.description.degree | 博士 | |
| dc.contributor.oralexamcommittee | 張國鎮,蔡克銓,林其璋,呂良正,黃震興,卿建業 | |
| dc.subject.keyword | 健康診斷,損害識別,系統識別,非線性環境影響,模態應變能,頻率響應函數,柔度矩陣, | zh_TW |
| dc.subject.keyword | structural health monitoring,damage detection,system identification,nonlinear environmental effects,modal strain energy,frequency response function,flexibility matrix, | en |
| dc.relation.page | 166 | |
| dc.rights.note | 同意授權(全球公開) | |
| dc.date.accepted | 2010-12-29 | |
| dc.contributor.author-college | 工學院 | zh_TW |
| dc.contributor.author-dept | 土木工程學研究所 | zh_TW |
| 顯示於系所單位： | 土木工程學系 | |
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