PSI - Issue 59

Olena Romashko-Maistruk et al. / Procedia Structural Integrity 59 (2024) 352–359 O. Romashko-Maistruk and V. Romashko / Structural Integrity Procedia 00 (2023) 000 – 000

358

7

2

1.5

1

Dynamic increase factor(DIF)

0.5

1.00E-06 1.00E-05 1.00E-04 1.00E-03 1.00E-02 1.00E-01 1.00E+00 1.00E+01

Strain rate of concrete ( έ )

Fig. 6. Dependence of DIF on the strain rate of compressed concrete with strength

:

- according to experiments Kono et al.

f c 29.2 

MPa

(2001); –– - according to formula (7); – – - according to CEB-FIP (1991).

2

1.5

1

Dynamic increase factor (DIF)

0.5

1.00E-06 1.00E-05 1.00E-04 1.00E-03 1.00E-02 1.00E-01 1.00E+00 1.00E+01

Strain rate of concrete ( έ )

Fig. 7. Dependence of DIF on the strain rate of compressed concrete with strength

: - according to experiments Kono et al.

f c 54.8 

MPa

(2001); –– - according to formula (7); – – - according to CEB-FIP (1991).

5. Conclusions Thus, thanks to the developed energy model, the analytical dependence of the dynamic increase factor DIF u limit values for compressed concrete was obtained. This dependence makes it possible to predict not only intermediate values of the DIF for compressed concrete at any strain rate, but also the entire process of concrete deformation in reinforced concrete elements and structures under the various intensities dynamic loads action. In other words, the results of the conducted research open wide opportunities in the development of a universal methodology for calculating reinforced concrete elements and structures under the any loads action.