Translated Titles

Modal Parameter Identification Based Only on Structural Response Measurements





Key Words

結構健康監測 ; 微振 ; 唯輸出系統識別 ; 隨機子空間系統識別方法 ; structural health monitoring ; ambient ; output-only system identification ; stochastic subspace identification technique



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Chinese Abstract

針對受環境擾動(例如交通、風力)之建築結構或橋樑進行持續之反應量測以評估結構健康狀態,為確保結構系統安全之最近診斷技術。對於裝設有感應器之建築結構,可採用強震前後之小地震量測訊號,以線性非時變之輸入輸出系統識別(Input-Output System Identification)法,求得強震前後之線性結構模態參數,作為損壞評估方法之輸入參數依據。但對於非地震期間之結構健康狀態監測,此時由於結構之振動源不確定且無法正確進行量測,必須使用唯輸出系統識別方法(Output-Only System Identification),進行結構模態參數之識別。本文主要應用隨機子空間識別(Stochastic Subspace Identification, SSI)法,可分為協方差型(Covariance-Driven, SSI-COV)與資料型(Data-Driven, SSI-DATA),在僅有建築結構輸出量測反應、且噪訊比較大之情況下,進行結構系統模態參數萃取。SSI-COV與SSI-DATA兩法皆假設結構主要受穩態白噪訊(White Noise)輸入作用,分別應用協方差(Covariance)觀念將噪訊影響去除,以及引入卡氏濾波概念以預估狀態重建狀態空間模型,進而求得系統模態參數。本文將針對SSI法之應用問題進行探討,並針對國內實際結構如台電大樓及中興大學土環大樓之微振量測反應進行分析,同時以強震輸入輸出反應識別所得結果進行比較,驗證SSI兩方法之準確性。

English Abstract

Structural health monitoring based on ambient measurements for safety of high-rise buildings and long-span bridges subject to environmental excitations is a state-of-the-art technique. For a monitored building, its linear dynamic properties before and after earthquakes can be obtained by system identification techniques based on input and output measurements. However, structural health monitoring during non-earthquake event, due to uncertainty and unmeasurable of input sources, needs the employment of output-only system identification techniques. This paper applies the Stochastic Subspace Identification (SSI) to the extraction of modal paramters of building on the basis of acceleration measurements. The SSI technique can be futher classified into covariance-driven (SSI-COV) and data-driven (SSI-DATA) algorithms. SSI-COV and SSI-DATA both are established based on the assumption of stationary white-noise input. SSI-COV applies covariance computation to separate nosie effect, while SSI-DATA addresses the Kalman Filter estimating state to reconstruct the state space system model. The SSI technique is also applied to the analysis of Tai-Power building and the Civil and Environmental Engineering Building in National Chung Hsing University. The results are compared with those obtained by an input/output identification technique based on earthquake measurements. This verifies SSI is useful in practice.

Topic Category 工學院 > 土木工程學系所
工程學 > 土木與建築工程
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