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. 6. Developed a three-dimensional numerical model of the bridge; (a) 3D view of span; (b) Cross-sectional view of the steel box girder.

5. Results and discussions In this study, acceleration data from sensors placed on girder-1 and girder-2 for all 22 spans were downloaded using the Sensor Connect software. The data for each source of excitation were separated based on the same time interval. Figure 7 (a) displays the acceleration graph of girder-1 for span-2 under human jump-1, while Figure 7 (b) shows the complete excitation due to HJ. To examine the combined acceleration of girder-1 and girder-2 of span-2 under HJ, figure 8 was generated. Similar analyses were conducted for all spans. Finally, the system identification parameters for the HJ excitation data were estimated using two methods: frequency domain (FDD) and time domain (SSI).

Fig. 7. (a) Acceleration graph of girder-1 of span-2 subjected human jump-1; (b) Acceleration graph of girder-1 of span-2 subjected to the HJ.