共 21 条
Application of modal-based damage-detection method to locate and evaluate damage in timber beams
被引:37
作者:
Choi, Fook Choon
[1
]
Li, Jianchun
[1
]
Samali, Bijan
[1
]
Crews, Keith
[1
]
机构:
[1] Univ Technol Sydney, Fac Engn, Ctr Built Infrastruct Res, Sydney, NSW 2007, Australia
关键词:
damage localization;
severity estimation;
timber;
experimental modal analysis;
modified damage index;
D O I:
10.1007/s10086-006-0881-5
中图分类号:
S7 [林业];
学科分类号:
0829 ;
0907 ;
摘要:
Modal-based damage-detection algorithms were used to identify the location of defects commonly found in timber and to estimate their severities. In this study, the authors propose modifications to an existing damage-detection algorithm for locating and evaluating damage by comparing the modal strain energy before and after damage using the first two flexural modes of vibration. Experimental verification was performed on pin-pin supported timber beams by employing the algorithms with extracted modal parameters using experimental modal analysis. Single and multiple cases of damage used to simulate pocket(s) of rot with various severities were inflicted by removing sections of timber beam specimens. The proposed damage indicator, computed from the first two flexural modes, was capable of detecting all damage locations. It was also able to estimate, with reasonable accuracy, the severity of damage in term of loss of sectional moment of inertia. The modified damage index method is generally reliable in detecting the location and estimating the severity of simulated defects in timber beams.
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页码:394 / 400
页数:7