PSI - Issue 81

Olena Romashko-Maistruk et al. / Procedia Structural Integrity 81 (2026) 269–275

273

0 0.2 0.4 0.6 0.8 1 1.2

Level of deformability of compressed concrete( ε c1,d / ε c1 )

0

20

40

60

80

100

120

140

Concrete class (f ck,cube , MPa)

6 1 10    s   ;

Fig. 3. The range of changes in the level of deformability of compressed concrete under dynamic loads for its different classes at strain rates: -

1 1 10    s   ; -

1 1 10   s   ; -

3 1 10   s   .

-

The ratio of the elastic-plastic coefficients of compressed concrete under the action of long-term and static loads can also be represented by a dependence similar to (5):

lc    1, 1 / l c с

,

(10)

l k k

 

6 1 10    s   is proposed to be taken

where the level of long-term strength of compressed concrete in the range of its strain rates

according to Romashko-Maistruk (2025) by the expression:

/ ))/9) (1 (log(    

, /

.

(11)

f

f

DIF







s

lc

ck l

ck

cu

The functional dependence of the elastic-plastic coefficient of compressed concrete under the action of long-term loads on its strain rate was also obtained Romashko-Maistruk (2025) using methods of numerical analysis of expressions (10) and (11) using the law of conservation of specific potential energy of materials deformation:

log(     m k k l 

/ ) /8,5

.

(12)

The range of changes in the elastic-plastic coefficient of compressed concrete for its various classes and strain rates under the action of long-term loads is shown in Fig. 4.

10.00 12.00 14.00

0.00 2.00 4.00 6.00 8.00 Elastic-plastic coefficient of compressed concrete(k l )

0

20

40

60

80

100

120

140

Concrete class (f ck,cube , MPa)

Fig. 4. The range of changes in the elastic-plastic coefficient of compressed concrete under prolonged loads for its different classes at strain rates: - 10 1 10    s   ; - 8 1 10    s   ; - 6 1 10    s   .