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
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| ϕ | |
| σsd | - The design stress of the bar
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| fbd | - The design value of the ultimate bond stress
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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
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| 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)
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| 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:
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The design anchorage length lbd is calculated using formula 8.4:
Where is: | lb,min | - The minimum anchorage length
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| α1 | - The coefficient in accordance with table 8.2 considering the effect of the bars form assuming adequate cover
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| α2 | - The coefficient in accordance with table 8.2 considering the effect of concrete minimum cover
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| α3 | - The coefficient in accordance with table 8.2 considering the effect of confinement by transverse reinforcement
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| α4 | - The coefficient in accordance with table 8.2 considering the influence of one or more welded transverse bars along the design anchorage length
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| 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
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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:
