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標題: 依有限量測之建築結構最佳振態還原及損壞位址偵測
Optimal Mode Shape Recovery and Damage Localization for Buildings Based on Incomplete Measurements
作者: 謝坤樹
Hsieh, Kun-Shu
關鍵字: 有限量測;incomplete measurements;系統識別;損壞評估;最佳化理論;模糊推論;damage localization;experimental verification;optimal design theory;fuzzy inference system
出版社: 土木工程學系所
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This study presents a damage localization technique for seismically-excited buildings based on changes of dominant frequencies identified from incomplete measurements. Both planer shear buildings and torsionally-coupled (TC) buildings were considered. The SRIM system identification technique was firstly used to estimate the dynamic properties of the building. However, mode shapes can not be obtained completely due to incomplete measurements. An optimal mode shape recovery technique was proposed to recover the complete first mode shape of the system. A time domain and a frequency domain objective function were considered. Pattern Search Tool in MATLAB was employed to minimize the objective functions. A fuzzy inference system (FIS) and a MAC (Mode Assurance Criterion) index were applied to develop the damage localization technique. Finally, a three-story benchmark building in NCREE was considered to examine the accuracy and applicability of the proposed damage localization technique via experimental data. The acceptance of the assumption was also verified.

本文針對平面剪力與扭轉耦合建築結構,探討僅量測部分樓層振動反應情況下,利用最佳振態還原技巧,還原完整之振態值,並進行層間損壞評估。本文方法首先針對未損壞之剪力結構,利用輸入、部分輸出量測訊號以SRIM系統識別技巧獲得部份模態參數,並由預估未知之振態和時域、頻域兩種最佳化指標,藉由Matlab程式內建之直接搜尋法,使未知之振態收斂至最佳值,作為該系統之最佳振態值,以還原完整之振態值。進而,利用還原之完整振態參數,進行結構損壞位址偵測。損壞位址偵測法,主要是建立損壞前後多模態頻率變化,應用模糊推論系統或模態確証準則(Mode Assurance Criterion, MAC)指標來判別損壞層間位置,並估算其層間勁度折減比。文中針對平面與扭轉耦合剪力建築結構進行數值模擬,探討本文方法之限制與適用性。最後並以國家地震工程研究中心標竿構架震動台試驗紀錄進行分析驗證,以驗證本法於實際應用時之可行性。
其他識別: U0005-1808201000430200
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