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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hammer in the first and second cases, and with a Human Jump (HJ) in the third case (Fig. 5 (b) and (c)). Data was recorded for three excitations in each case, with a total of nine sets of data being recorded. Acceleration data was recorded for alternative spans (total 22) so that the assessment of each pier could be interpreted.

Fig 5. (a) Placing of sensors; (b) Hammer excitation; (c) Human jump excitation; (d) Sensor Locations.

4.5. Numerical modeling Different modeling strategies have been followed in literature to understand the structural behavior of MB including 1D (De Santis & de Felice, 2014a, 2014b), 2D (Audenaert et al 2008, Gago et al 2011) and 3D (Brincker et al 2009, Bayraktar,et all 2009, Costa C et al 2015 & 2016, Kolla A et al 2021) subjected to peak loads. In this study, ANSYS 18.1, a Finite Element (FE) software, was used to create a simplified FE Modal of a bridge which can be seen in (Fig. 6). Geometrical measurements obtained from site visual surveys were used to model various structural components of the bridge, such as steel I girders and piers. Due to the bridge's location on the river Godavari with a well foundation, a fixed boundary condition was assumed at the bottom of the piers as no general completion plan was provided. The bridge has rigid abutments at both ends, which also required fixed boundary conditions to be applied to the side walls of the bridge. The spans were determined to have a E of 2x10 5 N/mm 2 , density of 78.5 kN/mm 3 , and a poisons ratio of 0.3 same can be seen in table.2. For further analysis piers will be modeled as solid blocks with granite stone properties, which will be considered as a young's modulus (E) of 9.27x10 4 N/mm 2 , density (ρ) of 27 kN/mm 3 , and a poisons ratio (µ) of 0.25.

Table 2. Material properties of span and pier

E (N/mm 2 )

ρ (kN/mm 3 )

µ

Structural Steel

2x10 5

78.5

0.3

Granite

9.27x10 4

27

0.25