PSI - Issue 10

N. Nikoloutsopoulos et al. / Procedia Structural Integrity 10 (2018) 141–147 N. Nikoloutsopoulos et al. / Structural Integrity Procedia 00 (2018) 000 – 000

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For strengthening techniques A.3 and B.4, where the theoretical results are higher than the experimental results, it should be noted that this is a consequence from the fact that the machine's capacity has been depleted.

Theoretical Results (k Ν) Experimental Results (k Ν)

50.0

40.0

35.7

35.6

32.2

30.2

29.3

27.7

27.6

30.0

26.6

21.2

20.7

20.0

15.5

13.8

10.0

Strengthening contribution [kN]

0.0

A.1

A.2

B.1

B.2

C.1

C.2

Strengthening Techniques

Fig. 4. Theoretical and experimental results of strengthening contribution with strip techniques.

Theoretical Results (k Ν) Experimental Results (k Ν)

51.3

47.7

50.0

45.7

45.7

44.2

43.2

40.0

31.0

27.6

30.0

20.0

10.0

Strengthening contribution [kN]

0.0

A.3

B.3

B.4

C.3

Strengthening Techniques

Fig. 5. Theoretical and experimental results of strengthening contribution with jacket techniques.

Fig.6 shows the theoretical and experimental strength results of all strengthening techniques with rope. It is seen that, the contribution of all techniques exceeds the required shear stress excluding the E.1.b and E.2.b techniques. Table 2 shows per strengthening technique the total cost, the strengthening contribution and whether it required drilling operation. The total cost includes the cost of materials and the cost of labour which required for the strengthening of a beam with 15x15x70 cm dimensions. Drilling operations are considered to be the destructive interventions on the construction body. The average cost of strengthening per beam for all the strengthening techniques chosen to be used, is 36.61 €. This was used in order to compare those techniques in mater of cost additionally to the shear stress requirement