請用此 Handle URI 來引用此文件:
http://tdr.lib.ntu.edu.tw/jspui/handle/123456789/88555
標題: | 以訊號分析方法進行長期結構健康監測 Using Signal Analysis Methods for Long-Term Structural Health Monitoring |
作者: | 黃于慈 Yu-Tzu Huang |
指導教授: | 周中哲 Chung-Che Chou |
關鍵字: | 結構健康監測,時頻分析,隨機子空間識別法,子空間識別法,遞迴式子空間識別法,主成分分析,經驗模態分解, structural health monitoring,time–frequency analysis of signal,stochastic subspace identification,subspace identification,recursive subspace identification,principal component analysis,empirical mode decomposition, |
出版年 : | 2023 |
學位: | 碩士 |
摘要: | 結構健康監測(SHM)是為了確保建築物在地震前後的安全性及可靠性所進行。本研究採用兩個案例的地震反應(國家地震工程研究中心大樓、三層樓鋼構架振動台實驗),以其監測資料進行系統性的分析,欲了解結構的變化及損傷評估。首先,根據監測資料,採用時頻分析方法了解結構物在微振及地震下的動態反應之時變性特性,並計算樓層間的相關性。通過環境振動的量測資料,採用協方差型隨機子空間識別法(SSI-COV)提取結構物在微振之下的模態頻率、模態形狀。從結構物地震反應資料,採用子空間識別法(SI)提取結構物在地震之下的動態特性,並計算其層間勁度。此外,以遞迴式子空間識別法(RSI)識別其動態特性之時變性,了解地震下結構動態特性的變化。以主成分分析(PCA)提取特徵,比較不同地震下,結構反應的差異,並識別阻尼比。除此之外,還開發一種以加速度資料估計位移的技術,應用於三層樓鋼構架振動台實驗之監測資料,以估計樓層反應的永久變位。提出一個以經驗模態分解(EMD)為理論基礎的含永久變位之位移估計方法,並以振動台實驗數據、實際結構的地震監測資料及近斷層地震動監測資料驗證此方法之可行性。 Structural Health Monitoring (SHM) is conducted to ensure the structural integrity of a building during earthquakes. In this study, two cases, namely the earthquake response of National Center for Earthquake Engineering Research (NCREE) building and the shaking table test of a 3-story steel frame, were analyzed to develop a systematic method of SHM to the changes of structural dynamic behavior and assess the structural damages using their monitoring data. First, based on the measurement, time-frequency analysis was employed to investigate the time-varying characteristics of the structural response, and the inter-story correlation was calculated. From the ambient vibration measurement, the Covariance-driven Stochastic Subspace Identification (SSI-COV) method was used to extract the modal frequencies and mode shapes of the structures. From the building earthquake response data, the Subspace Identification (SI) method was employed to extract the dynamic characteristics of the structures and calculate the inter-story stiffness. Besides, the Recursive Subspace Identification (RSI) method was used to identify the time-varying dynamic characteristics and understand the changes in the structural dynamic properties under earthquakes. Principal Component Analysis (PCA) was utilized to extract features and compare the differences in structural response under different earthquakes, as well as identify damping ratios. A technique on the estimation of displacement using acceleration measurement is developed and applied to the 3-story steel frame to estimate the permanent deformation of floor response. Empirical Mode Decomposition (EMD) was proposed to account for the estimation of permanent displacement. The feasibility of this method was verified using shaking table test data, earthquake response data of actual structures, and near-fault ground motion data. |
URI: | http://tdr.lib.ntu.edu.tw/jspui/handle/123456789/88555 |
DOI: | 10.6342/NTU202302277 |
全文授權: | 未授權 |
顯示於系所單位: | 土木工程學系 |
文件中的檔案:
檔案 | 大小 | 格式 | |
---|---|---|---|
ntu-111-2.pdf 目前未授權公開取用 | 17.87 MB | Adobe PDF |
系統中的文件,除了特別指名其著作權條款之外,均受到著作權保護,並且保留所有的權利。