A Study on Two-step Methods for Structural Damage Detection

• Main Authors: Yu-Cheng Chang, 張祐誠
• Other Authors: Dar-Yun Chiang
• Format: Others
• Language: zh-TW
• Published: 2006
• Online Access: http://ndltd.ncl.edu.tw/handle/07511616080444194080

碩士 === 國立成功大學 === 航空太空工程學系碩博士班 === 94 === In this thesis, structural damage detection analysis is studied with consideration of incomplete modal data under noisy conditions. In the process of damage detection, a two-step method in combination with system identification technique is employed. In the first step, we proposed a modification to the residual force method and the flexibility method, respectively, so that possibly damaged elements can be located more reliably. In the second step, the damage extent of possibly damaged elements is then evaluated using the residual force method and a global optimization method, respectively. Using numerical simulation, results of structural damage detection of a chain model obtained from different detection techniques are compared and discussed. Results show that the proposed method is accurate and robust using incomplete modal data under noisy conditions. Finally, applicability and effectiveness of the proposed method is demonstrated by damage detection of a truss structure.