Curved Steel Beams: From Box 600×200 to HN550, Built for Any Radius

Curved steel beams bend to follow circular or arc-shaped building plans. Below is data from an actual curved beam system with concentric arcs and radial beams.

---

Basic Specs

 

Item	Value
Structure type	Curved / circular steel frame
Main curved beam	Welded box 600×200×20
Secondary beams	HN550×200×10×16, HN450×200×9×14, HN294×200×8×12
Material	Q355B
Layout	Concentric arcs + radial beams
Bracing	Diagonal bracing between arcs

---

Beam Schedule

 

ID	Type	Section
GL9a	Curved box beam	Welded box 600×200×20
GL10	Curved H-beam	HN550×200×10×16
GL11	Radial secondary	HN294×200×8×12
GL12	Radial main	HN450×200×9×14

---

How It Works

The curved frame works as a radial grid:

Concentric arcs: curved beams follow the building radius

Radial beams: straight beams connect inner and outer arcs

Box for main arc: 600×200 box carries heavy load at outer arc

H-beams for secondary: standard rolled sections for lighter arcs

Diagonal bracing: between arcs to stabilize against lateral load

---

Advantages

Architectural freedom — curved beams follow any circular or oval plan

Box beam strong — 600×200 welded box resists torsion on curved path

Standard H-beams — HN550/450/294 are off-the-shelf sections

Q355B strength — lighter than Q235 for same load

Radial grid stable — concentric arcs + radial beams form rigid circular frame

---

Disadvantages / Limitations

Roll-bending cost — curved beams need roll-bending, more expensive than straight

Box beam hard to curve — 600×200 box needs heavy rolling equipment

Precise layout needed — every arc has different radius, custom fabrication

Connection complexity — radial beams meet curved beams at angles, complex joints

Erection tolerance tight — curved frame must close circle on site

---

Typical Applications

Circular buildings — rotundas, atriums, circular lobbies

Curved canopies — curved entrance canopies and walkway covers

Stadiums and arenas — curved roof structure for sports venues

Circular viewing platforms — observation decks and viewing platforms

Curved facades — curved curtain wall support structure

---

Fabrication Notes

Box and H-beams roll-bent to required radius, springback compensated

Curved beams fabricated in segments, spliced on site

Radial beams cut to angle to meet curved beam flange

All Q355B, shop-welded and painted before delivery

---

Curved steel beam system — welded box GL9a 600×200×20 for main arc, HN550/450/294 H-beams for secondary and radial, Q355B, concentric circular layout with diagonal bracing, built for curved architecture and circular building frames.

**WhatsApp**: +86‑13889862778, +86‑18242444407
**Email**: eddie@zdsteels.com, wells@zdsteels.com