Issue 67

H. Mostafa et alii, Frattura ed Integrità Strutturale, 67 (2024) 240-258; DOI: 10.3221/IGF-ESIS.67.18

Fig. 13 illustrates the first crack loads and failure loads for all the tested specimens. Figs. 14 to 16 show the bottom tension steel reinforcement strain, compressive concrete top surface strain, and grating strain for all tested specimens at the failure load. Fig. 17 shows the toughness of all tested specimens.

100 150 200 250 300 350 400

351,87

332,58

327,81 331,90 324,74

300,52

275,62

load (kN)

110,76

110,27

110,14

111,54

110,38

110,08

100,47

0 50

SP01 SP02 SP03 SP04 SP05 SP06 SP07

Specimen number

First crack load

Failure load

Figure 13: First crack loads and failure loads for all the tested specimens.

3,0

2,42

2,32

2,5

2,23 2,29

2,20

0,5 Bottom steel strain  sf (10 -3 ) 1,0 1,5 2,0

2,08

1,93

0,0

SP01 SP02 SP03 SP04 SP05 SP06 SP07

Specimen number

Figure 14: Bottom tension steel strain for all the tested specimens at failure load.

3,0

2,49

2,42

2,5

2,29

2,28

2,25 2,32

2,04

0,5 Concrete strain  cf (10 -3 ) 1,0 1,5 2,0

0,0

SP01 SP02 SP03 SP04 SP05 SP06 SP07

Specimen number

Figure 15: Concrete strain for all the tested specimens at failure load.

250