Curved Steel Corridor Frames: Why Round Tubes and Box Beams Make Arches Work

Curved (arc-shaped) steel corridor frames follow a curved plan line, using round tube columns and welded box beams to create open walkway canopies. Below is data from an actual curved corridor frame project.

Basic Specs

Member Schedule

Advantages

1. Architectural freedom — curved plan follows any arc or circle shape
2. Round tube columns — φ500×25 tube looks clean, no sharp corners
3. Box beams strong — welded box beams resist torsion on curved frames
4. Variable heights — 5.15m to 11.28m columns follow sloping roof lines
5. Grade 1 welds — box-to-tube joints fully welded, no bolted weak points

Disadvantages / Limitations

1. Needs 3D survey — curved geometry must be field-measured before fabrication
2. Custom bending — curved beams need roll-bending, not standard sections
3. More fabrication cost — box beams and curved cuts cost more than straight H
4. Weld inspection heavy — Grade 1 welds require ultrasonic testing
5. Precise erection needed — curved frame tolerance tight, easy to misalign

Typical Applications

1. Curved walkway canopies — shopping street and park walkways
2. Plaza entrance frames — curved entrance to civic plazas
3. Garden pergolas — curved garden pergola and walkway cover
4. Transit station canopies — curved bus/metro station canopies
5. Building connector corridors — curved corridor connecting two buildings

Fabrication Notes

• All members 3D surveyed and lofted before cutting
• Beams over 9 m span cambered per design
• Box-to-tube joints Grade 1 full penetration weld, ultrasonic tested
• Flange cut by mechanical shear, not welded
• Deepened drawings approved by designer before fabrication

Curved steel corridor frame — φ500×25 round tube columns, welded box beams 600×250×22 to 350×200×16, Q355B, variable heights 5.15–11.28 m, Grade 1 box-to-tube welds, built for curved walkway and entrance canopies.