# Crack Width Calculation Eurocode 2 • Where the bonded reinforcenlent is fixed at reasonably close centres within the tension zone (spacing ≤ 5( c + Φ/2), cf. Figure 7.2), the maximum crack spacing s r,max may be calculated as follows: s r,max = k 3 c + k 1 k 2 k 4 Φ / ρ p,eff (7.11) where: Φ is the bar diameter. Where a mixture of bar diameters is used in a section, an equivalent diameter,, should be used. C is ρ p,eff see the difference of the mean strains above k 1 is a coefficient which takes account of the bond properties of the bonded reinforcement: k 1 = 0,8 for high bond bars, k 1 = 1,6 for bars with an effectively plain surface (e.g. Prestressing tendons).

Feb 13, 2018 - Crack width in Tunnels. A thesis on the accuracy of the Eurocode 2 crack width calculation of flexural cracks in structures with large thicknesses.

K 2 is a coefficient which takes account of the distribution of strain: k 2 = 0,5 for bending, k 2 = 1,0 for pure tension. Intermediate values of k 2 should be used for cases of eccentric tension or for local areas: k 2 = ( ε 1 + ε 2)/(2 ε 1) (7.13) where ε 1 is the greater and ε 2 is the lesser tensile strain at the boundaries of the section considered, assessed on the basis of a cracked section.

K 3 is a Nationally Determined Parameter, see k 4 is a Nationally Determined Parameter, see. • Where the spacing of the bonded reinforcement exceeds 5( c + Φ/2) (cf. Figure 7.2), or where there is no bonded reinforcement within the tension zone, the maximum crack spacing s r,max may be calculated as follows: s r,max = 1,3( h - x) (7.14) where: h is the overall depth of the section (see ) x is the neutral axis depth of the section (see ). This application calculates the crack width w k from your inputs. Intermediate results will also be given. First, change the following option if necessary.

• Where the bonded reinforcenlent is fixed at reasonably close centres within the tension zone (spacing ≤ 5( c + Φ/2), cf. Figure 7.2), the maximum crack spacing s r,max may be calculated as follows: s r,max = k 3 c + k 1 k 2 k 4 Φ / ρ p,eff (7.11) where: Φ is the bar diameter.

Where a mixture of bar diameters is used in a section, an equivalent diameter,, should be used. C is ρ p,eff see the difference of the mean strains above k 1 is a coefficient which takes account of the bond properties of the bonded reinforcement: k 1 = 0,8 for high bond bars, k 1 = 1,6 for bars with an effectively plain surface (e.g. Prestressing tendons). K 2 is a coefficient which takes account of the distribution of strain: k 2 = 0,5 for bending, k 2 = 1,0 for pure tension. Intermediate values of k 2 should be used for cases of eccentric tension or for local areas: k 2 = ( ε 1 + ε 2)/(2 ε 1) (7.13) where ε 1 is the greater and ε 2 is the lesser tensile strain at the boundaries of the section considered, assessed on the basis of a cracked section. K 3 is a Nationally Determined Parameter, see k 4 is a Nationally Determined Parameter, see. • Where the spacing of the bonded reinforcement exceeds 5( c + Φ/2) (cf.

Figure 7.2), or where there is no bonded reinforcement within the tension zone, the maximum crack spacing s r,max may be calculated as follows: s r,max = 1,3( h - x) (7.14) where: h is the overall depth of the section (see ) x is the neutral axis depth of the section (see ). This application calculates the crack width w k from your inputs.

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