標題: Locating damaged storeys in a structure based on its identified modal parameters in Cauchy wavelet domain
作者: Su, Wei C.
Le, Tuyen Q.
Huang, Chiung S.
Lin, Pei Y.
土木工程學系
Department of Civil Engineering
關鍵字: Structural damage detection;DLVs method;Continuous wavelet transform;System identification;ARX model
公開日期: 1-一月-2018
摘要: Structural damage detection based on the changes of dynamic properties is a major topic for structural health monitoring. In this paper, efforts are made to extend the flexibility based damage localization methods, especially the damage locating vectors (DLVs) method, to the case of earthquake vibration, where the finite element model and mass matrices are not available. First, a new method using continuous Cauchy wavelet transform (CCWT) and state-variable time series model is proposed to identify the modal parameters of a structure. Then the flexibility matrix can be constructed from the identified modal parameters. Second, a modified DLVs damage assessment approach is also proposed to locate damage positions in the structure through a weighted relative displacement index (WRDI). This index is calculated by using DLVs vectors determined from the change of flexibility matrix before and after damage of the structure. Numerical analyses demonstrate that the proposed process can indeed monitor the variation of stiffness for each storey. These two approaches are further applied to process the dynamic responses of three-storey and eight-storey steel frames in shaking table tests. The proposed scheme is also proved to be superior to mode shape based methods (CMS, COMAC) in monitoring the variation of stiffness for each storey. (C) 2017 Elsevier Inc. All rights reserved.
URI: http://dx.doi.org/10.1016/j.apm.2017.02.006
http://hdl.handle.net/11536/144417
ISSN: 0307-904X
DOI: 10.1016/j.apm.2017.02.006
期刊: APPLIED MATHEMATICAL MODELLING
Volume: 53
起始頁: 674
結束頁: 692
顯示於類別:期刊論文