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Anchorage

Anchorage lengths are calculated in accordance with the chapter 8.4 of EN 1992-1-1. The basic required anchorage length lb,rqd is calculated according to the formula 8.3 for any bar:

Where is:

lb,rqd

  • The basic required anchorage length

ϕ

  • The bar diameter

σsd

  • The design stress of the bar

fbd

  • The design value of the ultimate bond stress

The design value of the ultimate bond stress fbd is calculated using formula 8.2:

Where is:

fctd

  • The design value of concrete tensile strength

η1

  • The coefficient related to the quality of the bond condition and the position of the barduring concreting (value is 1.0 for good bond conditions and 0.7 for other cases)

η2

  • The coefficient related to the bar diameter. Value is 1.0 for all bars with diameter up to 32mm. The coefficient is calculated using following formula for other cases:

The design anchorage length lbd is calculated using formula 8.4:

Where is:

lb,min

  • The minimum anchorage length

α1

  • The coefficient in accordance with table 8.2 considering the effect of the bars form assuming adequate cover

α2

  • The coefficient in accordance with table 8.2 considering the effect of concrete minimum cover

α3

  • The coefficient in accordance with table 8.2 considering the effect of confinement by transverse reinforcement

α4

  • The coefficient in accordance with table 8.2 considering the influence of one or more welded transverse bars along the design anchorage length

α5

  • The coefficient in accordance with table 8.2 considering the effect of the pressure transverse to the plane of splitting along the design anchorage length

The minimum anchorage length lb,min is calculated using formula 8.6 for anchorages in tension:

The minimum anchorage length lb,min is calculated using formula 8.7 for anchorages in compression:

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