PSI - Issue 52

Govardhan Polepally et al. / Procedia Structural Integrity 52 (2024) 280–292 Govardhan Polepally/ Structural Integrity Procedia 00 (2019) 000 – 000

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Fig. 8. Acceleration graph of span-2 subjected to HJ; (a) Girder-1; (b) Girder-2.

5.1. FDD results FDD analysis has been carried out in this study to estimate the dynamic properties of spans subjected to AVT. For this purpose, the HJ excitation data has been considered for the analysis. Further, the first bending frequency of each girder of all spans (22 spans) has been identified, and the same has been plotted (Fig. 9) for the subjected to stating of degradation within the span. Plotting is in such a way that the x-axis contains span numbers and the y-axis contains the respective first bending frequency (Hz). It has been understood by the comparison of each plot and the three plots, that jump-1 & 2 frequencies are matching exactly, which means there is no stiffness change within the spans (Girder-1 & Girder-2) whereas jump-3 frequencies deviate by 15% within the span. It means that there may be a chance of data being corrupted during the separation of data.

Fig. 9. Comparison of first bending frequency within the span using FFD subjected to HJ; (a) For HJ-1; (b) For HJ-2; (c) For HJ-3.