Structural steel and sections
C+ and Z purlins
Plasterboard supports
Solar mounting systems
PRS
Welded built-up sections · length up to 15,000 mm
Web and flanges cut to exact dimensions then submerged-arc welded: the section is designed for the project's actual forces. Long spans over 30 m, heavy loads, crane runway beams: where rolled sections stop.
- GradeS355JR standard · S275JR on request
- Maximum length15,000 mm
- FinishesUncoated or primed
- Submerged-arc welding web and flanges cut to exact dimensions
- Custom sections web 200 to 2,500 mm, flange 150 to 1,000 mm
- Length up to 15,000 mm bolted splices beyond
- Portal columns and rafters
- Long spans over 30 m
- Heavy loads and crane runway beams
| Designation | Weight (kg/m) | h (mm) | b (mm) | s (mm) | t (mm) | A (cm²) | Ix (cm⁴) | Iy (cm⁴) | Wel,x (cm³) | Wel,y (cm³) |
|---|---|---|---|---|---|---|---|---|---|---|
| WB 333×6 - 8×180 | 38,3 | 349 | 180 | 6 | 8 | 48,8 | 10 220 | 778 | 586 | 86 |
| WB 333×6 - 10×200 | 47,1 | 353 | 200 | 6 | 10 | 60,0 | 13 615 | 1 334 | 771 | 133 |
| WB 400×6 - 10×200 | 50,2 | 420 | 200 | 6 | 10 | 64,0 | 20 013 | 1 334 | 953 | 133 |
| WB 500×6 - 10×200 | 55,0 | 520 | 200 | 6 | 10 | 70,0 | 32 263 | 1 334 | 1 241 | 133 |
| WB 500×6 - 12×220 | 65,0 | 524 | 220 | 6 | 12 | 82,8 | 40 859 | 2 130 | 1 560 | 194 |
| WB 500×6 - 12×300 | 80,1 | 524 | 300 | 6 | 12 | 102,0 | 53 445 | 5 401 | 2 040 | 360 |
| WB 500×8 - 15×300 | 102,0 | 530 | 300 | 8 | 15 | 130,0 | 68 026 | 6 752 | 2 567 | 450 |
| WB 600×8 - 12×220 | 79,1 | 624 | 220 | 8 | 12 | 100,8 | 63 846 | 2 132 | 2 046 | 194 |
| WB 600×8 - 15×250 | 96,6 | 630 | 250 | 8 | 15 | 123,0 | 85 331 | 3 909 | 2 709 | 313 |
| WB 600×8 - 15×300 | 108,3 | 630 | 300 | 8 | 15 | 138,0 | 99 518 | 6 753 | 3 159 | 450 |
| WB 750×8 - 15×300 | 117,8 | 780 | 300 | 8 | 15 | 150,0 | 159 818 | 6 753 | 4 098 | 450 |
| WB 750×8 - 20×300 | 141,3 | 790 | 300 | 8 | 20 | 180,0 | 206 035 | 9 003 | 5 216 | 600 |
Asymmetric sections for crane runways
| Designation | Crane | Weight (kg/m) | h (mm) | b (mm) | s (mm) | t (mm) | A (cm²) | Ix (cm⁴) | Iy (cm⁴) | Wel,x (cm³) | Wel,y (cm³) |
|---|---|---|---|---|---|---|---|---|---|---|---|
| WB 600×8 - 12×250/10×200 | 5 t | 76,9 | 622 | 250/200 | 8 | 12/10 | 98,0 | 60 133 | 2 232 | 1 761 | 179 |
| WB 750×8 - 15×300/12×200 | 10 t | 101,3 | 777 | 300/200 | 8 | 15/12 | 129,0 | 123 766 | 4 178 | 2 753 | 279 |
| WB 750×8 - 20×300/20×220 | 15 t | 128,7 | 790 | 300/220 | 8 | 20/20 | 164,0 | 180 000 | 6 278 | 4 161 | 419 |
| WB 1000×10 - 15×350/12×250 | 20 t | 143,3 | 1 027 | 350/250 | 10 | 15/12 | 182,5 | 288 174 | 6 930 | 5 013 | 396 |
Built-up equivalent of a rolled section
Choose the section from your calculation note (from 300 upwards) and its use: the tool proposes the S355JR built-up section with the same moment and the same deflection, from the standard range when suitable, otherwise custom-made.
Equivalence by section, not by member. The class 3 built-up section is compared elastically (Wel,x × 355) with the resistance moment of the rolled section, plastic or elastic according to your note; same Ix for deflection; for a column, effective web area (EN 1993-1-5) and weak-axis inertia; for a crane runway, the top flange alone keeps half the weak-axis inertia of the rolled section. To be checked by the engineering office on the project: lateral-torsional buckling (Iy and torsional stiffness of the built-up section are lower; restraint of the compression flange by purlins or girts is decisive), web buckling under concentrated loads, flexural buckling, fatigue and connections, to be redesigned for the new depth.
Configure a built-up section
Atlas Steel standard range: 12 symmetrical sections and 4 asymmetrical sections for crane runways (designation web × thickness - top flange / bottom flange). Other sections are made to measure.