PSI - Issue 70

Maheshwari Sonker et al. / Procedia Structural Integrity 70 (2025) 477–484

482

10

M65

8

RMSD MAPD CC (Correlation Coefficient)

6

%

4

2

0

1-6 mm 2_6 mm 1-8 mm 2_8 mm 1-12 mm 2_12 mm

Depth of damages

Fig. 4. RMSD, MAPD,CC value of damages identical dimensions at varying depths.

4.1 Evaluation of Mechanical Parameters As shown in Fig. 5 and 7, A decreasing trend in equivalent stiffness (K) with increasing damage depth (6 mm, 8 mm, 12 mm) in composite fibre concrete (M60, M65). Conversely, equivalent damping (c) increases with progressively increasing damage depths as shown in Fig. 6 and 8. The reduction in quivalent stiffness and quivalent damping reflects the growing severity of damage, confirming the EMI technique’s responsiveness to structural degradation .

1900 2000 2100 2200 2300 2400 2500 2600 2700

M60

K (10 4 N/m)

BS

1_6mm 2-6mm 1_8mm 2-8mm 1_12mm 2-12mm

Depth of damages

Fig. 5. Variation of the equivalent stiffness versus damage depth for M60 grade concrete.

5800

M60

5600

5400

5200 C (Ns/m)

5000

BS 1-6mm 2-6mm 1-8mm 2-8mm 1-12mm 2-12mm

Depth of Damage

Fig. 6. Variation of the equivalent damping versus damage depth for M60 grade composite concrete.