Application of Displacement Frequency Response Function in Building Structural Health Monitoring

• Main Authors: Chen, Xuan-Zhi, 陳宣治
• Other Authors: Hung, Shih-Lin
• Format: Others
• Language: zh-TW
• Published: 2012
• Online Access: http://ndltd.ncl.edu.tw/handle/71508928612478109672

碩士 === 國立交通大學 === 土木工程學系 === 101 === Recently, non-contact measurement technique has received considerable interest that provides accurate measurements of the full field strain distribution, and the process of the approach is simple. This study proposes a structural health monitoring (SHM) system which combined DIC method and a displacement-based structural frequency response function (FRF) analysis method. The system includes three sub-systems, image processing, and numerical simulation analysis and damage diagnosis. A numerical study is first employed to evaluate the validation and performance of the proposed system. An eight-story steel structure was then used as an experiment modal and examined on NCREE via DIC technique to detect the simulated damage of steel frame. Also, a modified curvature of sub-structure FRF (subFRF) approach is developed to detect damage location of structures. In experiment, the index of subFRF is used for evaluation and identification of the damage location. The results from different approaches and data acquisition methods are compared in order to demonstrate the applicability of sub-structure FRF method to structural health monitoring. The simulation and experiment results reveal that the modified subFRF curvature method is more sensitive in experiment than numerical simulations. Also, simulation results indicate that this method has better performance on the discontinuous damage locations of damage cases, but encounter continuous positions would not be able to do the correct judgment.