PSI - Issue 52

Govardhan Polepally et al. / Procedia Structural Integrity 52 (2024) 487–505 Govardhan Polepally/ Structural Integrity Procedia 00 (2019) 000 – 000

501 15

Fig. 12. Numerical analysis (a) Modal analysis of bridge-1; (b) Static analysis of bridge-1

For each bridge, Table 10 lists the frequencies of 20 distinct modes. For the first five modes, Bridge-5 has the lowest frequency values, whereas modes 1-4 have the highest frequency values for Bridge-1. A bridge's higher frequency values indicate a more robust construction, whilst its lower frequency values denote a more flexible one. The findings of the modal analysis are crucial for determining the bridges' fundamental frequencies and researching their dynamic behavior. According to the findings, each bridge has a distinct vibrational activity that is characterized by various mode frequencies. In order to develop and execute efficient vibration control methods that maintain the structural integrity of the bridges, it is crucial to identify possible modes of failure for the bridges.

Table 10. Modal analysis results

Frequencies (Hz) Bridge-1

Mode

Bridge-2

Bridge-3

Bridge-4

Bridge-5

Mode 1 Mode 2 Mode 3 Mode 4 Mode 5 Mode 6 Mode 7 Mode 8 Mode 9 Mode 10 Mode 11 Mode 12 Mode 13 Mode 14 Mode 15

28.31

28.614 28.809 29.486 30.632 32.234 34.258 36.688 39.528 40.367 42.802 44.228 44.407 45.151 46.443 46.542

22.937 27.108 29.666 32.025 39.773 44.633 47.215 48.275 54.851 58.705 60.197 61.536 74.353 77.107 43.9

29.53

21.321 26.436 27.491 31.346 38.779 42.518 43.557 46.502 47.174 52.508 58.526 59.436 68.513 72.217 56.92

28.839 30.602 33.509 37.475 38.622 42.526 43.713 44.249 46.315 48.789 50.169 51.755 52.444 49.95

31.467 35.976 37.862 45.464 47.009 47.815 48.624 52.022 55.976 59.412 61.229 61.689 65.431 51.6