Issue 48

R. S. Y. R. C. Silva et alii, Frattura ed Integrità Strutturale, 48 (2019) 693-705; DOI: 10.3221/IGF-ESIS.48.65 703 (a) (b) Figure 16 : CWT using Coif4-Case D1: (a) 3D view; (b) 2D view. As the results suggest in Figs. 15, 16, 17, and 18, the largest amplitude wavelet coefficients peaks are associated with the damage area for cases D1 and D2. Nevertheless, considerable values also occurred at the boundaries of the bridge. This effect has been observed by many authors [8,18]. In Figs. 15 and 16, the left and right plots, respectively, represent the CWT analysis in 3D and 2D. In these figures, it can be observed that the wavelet coefficients in the damaged region achieved very large amplitudes due to the singularities in the sign (mode shape data) caused by the presence of the damage D1. (a) (b) Figure 17 : CWT using Db5-Case D2: (a) 3D view; (b) 2D view. (a) (b) Figure 18 : CWT using Coif4-Case D2: (a) 3D view; (b) 2D view.