標竿結構體H之系統識別與損壞評估

Chaoyang University of Technology Institutional Repository > 理工學院 > 營建工程系 > 博碩士論文 > Item 310901800/28410

Please use this identifier to cite or link to this item: http://ir.lib.cyut.edu.tw:8080/handle/310901800/28410

Title:	標竿結構體H之系統識別與損壞評估 System Identification and Damage Assessment of Benchmark Model H
Authors:	駱政韋 Lo, Cheng-wei
Contributors:	營建工程系碩士班王淑娟 Grace S. Wang
Keywords:	系統識別;標竿結構體;損壞評估 Damage Assessment;System Identification;Benchmark Model
Date:	2011-12-31
Issue Date:	2016-01-23 14:46:15 (UTC+8)
Abstract:	摘要系統識別首先是應用於航空工程與機械工程，後來才被引用至土木工程上。系統識別是利用數值方法分析系統產生之輸出入量測以建立系統之模型的一種技巧。藉由系統識別之技巧除了可預測結構物未來可能產生之反應外，亦可監測系統參數或特性之變化，甚至根據這些變化了結構受損之情形，決定後續必要之處置。近二十年來，很多學者從事結構健康診斷之研究。所謂結構健康診斷是利用比較結構目前之狀態與未受損狀態或基線狀態(Baseline state)之過程來決定結構物受地震或其他型式外力作用下是否有損壞產生，從而決定損壞之位置及程度。現時做的損壞評估實際上實測建築都為輕微或嚴重之損壞，建立損壞指標上較不足，所以利用實驗方式去模擬不同損壞狀態，藉用各種不同程度損壞狀態之識別參數，看能否找出描述損壞程度之損壞指數，甚至是不同損壞程度之門檻值(Threshould Value)。因此本文利用系統識別之技巧分析標竿結構體H模型一系列模擬斜撐損壞之振動台試驗，該結構體模型(Benchmark Model)為雙邊X向立面具有不同斜撐數目的一系列結構類型，長向(X向)為3公尺雙邊立面有斜撐，短向(Y向)為2公尺均無斜撐之立體鋼構架。振動台試驗順序由雙邊立面全斜撐(Full Bracing, FB)開始至雙邊立面無斜撐(Bare Frame, BF)，其中Case1至Case3，分別表示從一樓開始至三樓逐一拿掉X向後側立面斜撐之模型類別，以模擬不同損壞程度的偏心結構；最後拿掉Ｘ向全部斜撐，剩下空構架。在歷次地震作用下之彈性系統動力參數變化，並且利用損壞評估方式來判斷損壞之程度與樓層。 ABSTRACTField of system identification has become important discipline due to the increasing need to estimate the behavior of a system with partially known dynamics. Identification is basically a process of developing or improving a mathematical model of a dynamic system through the use of measured experimental data. In addition to updating the structural parameters for better response prediction, system identification techniques made possible to monitor the current state or damage state of the structures.At present, the buildings under damage assessment are actually with minor or serious damages, so the damage indices evaluated accordingly may not be adequate. To solve the problem, the experimental method is used to simulate different states of damage, followed by identifying the parameters of the associated damaged structure. Then, the damage indices describing the damage degree can be computed using the identified parameters, and the threshold value of different damage state can be reached. Therefore, in the paper, the technique of system identification is used to analyze the shaking table test of a series of simulated diagonal bracings in the Benchmark Model H. The structural model (Benchmark Model) is a series of structures simulating different numbers of diagonal bracings on both sides of x direction. The dimention of the structure is 3m in the longitudinal direction and 2m in the transverse direction. Shaking table test is conducted in the sequence from Full Bracing in the x direction to Bare Frame. From Case1 to Case3, it means that the vertical diagonal bracings of the outer side are removed one by one from the first floor to the third floor in the x direction. In this way, the damage of different degree can be modelled by eccentricity of different state. Finally, all diagonal bracings in the x direction are removed, leading to a Bare frame. With the change in the dynamic parameters of elastic system under earthquake, the damage assessment method is used to determine the degree of damage and the location or floor of damage.
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