Issue 39

S. Seitl et alii, Frattura ed Integrità Strutturale, 39 (2017) 118-128; DOI: 10.3221/IGF-ESIS.39.13 123 B 2 ( E =5)= -0.5625 + 5.0149α - 7.4585α 2 + 5.1659α 3 - 0.636α 4 (9) B 2 ( E =20)= -0.4339 + 3.7445α - 2.3166α 2 - 2.6828α 3 + 3.5752α 4 (10) B 2 ( E =100)= -0.2136 + 1.0257α + 7.8949α 2 - 17.492α 3 + 10.933α 4 (11) Figure 6 : Values of COD (opening at load line) versus a/W , the effect of elasticity modulus ratio (steel E =210 GPa). Figure 7 : Values of CMOD (crack mouth open displacement) versus a/W , the effect of elasticity modulus ratio (steel E =210 GPa). Compliance functions (according Eqs. (4) and (5)) for opening displacement under the loading force (COD) and for opening displacement at the crack mouth (CMOD) follow for Young’s modulus of concrete E =5, 20 and 100 GPa, respectively: for COD 0,0 5,0 10,0 15,0 20,0 25,0 30,0 0 0,1 0,2 0,3 0,4 0,5 0,6 0,7 0,8 0,9 1 f COD [‐] a/W [‐] E=5 GPa E=20 GPa E=60 GPa E=100 GPa 0,0 5,0 10,0 15,0 20,0 25,0 30,0 35,0 0 0,1 0,2 0,3 0,4 0,5 0,6 0,7 0,8 0,9 1 f CMOD [‐] a/W [‐] E=5 GPa E=20 GPa E=60 GPa E=100 GPa