Issue 58

R. Capozucca et alii, Frattura ed Integrità Strutturale, 58 (2021) 402-415; DOI: 10.3221/IGF-ESIS.58.29

10 15 20

load P [kN]

0 5

D D 1 2 D3

0

200

400

600

800 1 000

(b) ε c ( · 10 -6 )

10 15 20

load P [kN]

0 5

D D 1 2 D3

0 500 1 000 1 500 2 000 2 500 3 000 3 500

ε s ( · 10 -6 )

(c) Figure 5: Diagrams (a) load, P, vs deflection, δ ; (b) load, P, vs strain, ɛ c , at the edge of compressive concrete and (c) load, P, vs strain of tensile steel, ɛ s – RC beam B1 without strengthening.

1 1 0 5 2 2 0 5 3 3 0 5 4 4 0 5 0

load P [kN]

D D 1 2 D D 3 4 D Fa 5 ilure condition

0 5

5

10 δ [mm]

15

20

(a)

406