Issue 51

F. Jafari et alii, Frattura ed Integrità Strutturale, 51 (2020) 136-150; DOI: 10.3221/IGF-ESIS.51.11

Figure 5 : ACI beta index for torsion-bending.

Figure 6 : ACI beta index for bending-shear.

ACI safety surface for bending-shear Fig. 6 shows the standard safety surface of ACI concrete for shear and bending. The ACI standard surface for combination states (shear and bending) is close to the shear state. ACI safety surface for bending-shear- torsion The combination of shear, bending and torsional states is carried-out using Eqn. 13. Graph 7 shows the safety index for the three combination states. According to this figure, the ACI beta indexes for L, rectangular, and L cross-sections are 4.05,

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