Structural Health Monitoring for Frame Models with Damaged Joints

論文發表人:林俊宏  (加州大學聖塔芭芭拉校區機械工程博士班)

 

http://spie.org/smart-structures-nde.xml

 

本論文提出一個利用量測結構之動態反應，可用於桁架結構，包括樑、柱、接頭等部位之結構檢測法。此研究包含了一個將複雜的桁架模型簡化的技巧，並以此技巧增強了一個之前提出的結構動態檢測法。我們利用在地震發生時，在每一層樓量測到的結構動態反應，例如加速度、速度、位移等資訊，配合一個將結構中不同區域狀態分離的演算法，使得結構中的損壞可以被偵測以及定位出來。在此論文中，我們利用兩個數值模擬的模型來驗證這個結構檢測法，第一個例子是一個三層樓的桁架結構，另一個例子則是一個類似結構檢測基準模型的四層樓、雙間隔的桁架結構，這兩個例子都成功地驗證了我們提出的結構動態檢測法。

 

This paper presents a method of detecting and locating structural damages in beams, columns or joints of a frame structure by directly using structural vibration measurements. A previously developed damage diagnosis technique is enhanced by including an equivalently simplified lumped-mass model of the complex frame structure. The parameters derived from the simplified lumped-mass model are used in the damage diagnosis algorithm, while the actual dynamic responses measured from the frame structure under seismic excitation are used as the inputs. The dynamic responses measured from different floors can be decoupled by using the proposed damage diagnosis algorithm. As a result, damages in the frame structure can be detected and located. Numerical examples of a three-story-one-bay steel frame model and a benchmark-liked four-story-two-bay steel frame model are considered to demonstrate and evaluate the usefulness and effectiveness of the present method.