Calculations › Anchorage & Lap Lengths
Anchorage & Lap Lengths
EN 1992-1-1
Calculates design anchorage length lbd and lap length l₀ for reinforcing bars to EN 1992-1-1 §8.
Example inputs
Bar diameter ø16 mm
Concrete gradeC25/30
Bond conditiongood
Nominal cover35 mm
Anchorage typestraight
As,req1200 mm²
As,prov1400 mm²
% bars lapped50
National AnnexUK
Results
Anchorage & Lap Lengths
EN 1992-1-1 §8 · ø16 · C25/30 · good bond
Results
✓ ANCHORAGE PASS
util 0.86449.00EN 1992-1-1 §8.4
| η₁ (bond condition) | 1 | — | EN 1992-1-1 §8.4.2 |
| η₂ (bar size) | 1 | — | |
| fctd = 0.7·fctm / γc | 1.213 | N/mm² | |
| fbd = 2.25·η₁·η₂·fctd | 2.729 | N/mm² | EN 1992-1-1 §8.4.2 |
| σsd (design stress) = fyk / γs | 434.78 | N/mm² | |
| lb,rqd = (ø/4)·(σsd/fbd) | 637 | mm | EN 1992-1-1 §8.4.3 |
| α₁ (bar shape) | 1 | — | EN 1992-1-1 Table 8.2 |
| α₂ (cover) | 0.821875 | — | EN 1992-1-1 Table 8.2 |
| lb,min = max(0.3·lb,rqd, 10ø, 100) | 191 | mm | |
| lbd (design anchorage length) = α₁·α₂·lb,rqd·(As,req/As,prov) ≥ lb,min | 449 | mm | EN 1992-1-1 §8.4.4 |
✓ LAP PASS
util 0.86628.00EN 1992-1-1 §8.7
| % bars lapped at section | 50 | % | |
| α₆ (% lapped factor) | 1.4 | — | EN 1992-1-1 Table 8.3 |
| l₀,min = max(0.3·α₆·lb,rqd, 15ø, 200) | 268 | mm | |
| l₀ (lap length) = α₁·α₂·α₆·lb,rqd·(As,req/As,prov) ≥ l₀,min | 628 | mm | EN 1992-1-1 §8.7.3 |
Try it yourself
Run this calc with your own inputs