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CHS Column
EN 1993-1-1
EN 1993-1-1 CHS column — compression and buckling
Example inputs
Section114.3x5CHS
Steel gradeS275
NEd (kN)100 kN
Effective Length (mm)3000 mm
Cold-formedfalse
National annexUK
Results
CHS Column — 114.3x5CHS
S275 · NEd=100kN · EN 1993-1-1
Results
✓ CROSS SECTION PASS
util 0.331.00EN 1993-1-1 §5.5 Table 5.2
| ε = √(235/fy) = √(235/fy) | 0.924 | — | EN 1993-1-1 §5.5 |
| ε² = 235/fy | 0.855 | — | |
| d/t ratio = d/t | 22.86 | — | |
| Class 1 limit (50ε²) | 42.73 | — | |
| Class 2 limit (70ε²) | 59.82 | — | |
| Class 3 limit (90ε²) | 76.91 | — | |
| Section class | 1 | — |
✓ COMPRESSION RESISTANCE PASS
util 0.21100.00EN 1993-1-1 §6.2.4
| fy yield strength | 275 | N/mm² | EN 1993-1-1 Table 3.1 |
| A cross-section area | 1717 | mm² | |
| NEd design axial force | 100 | kN | |
| NRd compression resistance = A × fy / γM0 | 472.18 | kN | EN 1993-1-1 §6.2.4 |
✓ BUCKLING PASS
util 0.29100.00EN 1993-1-1 §6.3.1
| Lcr effective length | 3000 | mm | |
| I second moment of area | 256.9 | cm⁴ | |
| Ncr elastic critical force = π²EI / Lcr² | 591.62 | kN | EN 1993-1-1 §6.3.1 |
| λ̄ slenderness = √(A·fy / Ncr) | 0.893 | — | |
| α imperfection factor | 0.21 | — | EN 1993-1-1 Table 6.2, curve a |
| φ = 0.5[1 + α(λ̄ − 0.2) + λ̄²] | 0.971 | — | |
| χ reduction factor = 1/(φ+√(φ²−λ̄²)) | 0.739 | — | EN 1993-1-1 §6.3.1.2 |
| Nb,Rd buckling resistance = χ × A × fy / γM1 | 348.94 | kN |
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