Issue 73

N. Laouche et alii, Fracture and Structural Integrity, 73 (2025) 88-107; DOI: 10.3221/IGF-ESIS.73.07

Figure 5: Crack location effect on the frequency’s parameters of the beam for different boundary conditions and crack depth.

Figure 6: Crack location effect on the critical buckling parameter of the beam for different boundary conditions and crack depth. Figs. 5 and 6 illustrate the influence of crack location (steel outer layer vs. inner composite polymer concrete core) on frequencies and critical buckling parameters of the box beam under varying boundary conditions (simply supported (S-S), clamped-clamped (C-C), clamped-free (C-F)) and crack depths. For S-S beams, the critical crack location is consistently at the midspan for both frequencies and buckling, regardless of crack depth or material (steel/composite), with symmetric

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