1. Two Different Section Forms
An H-beam is an open section shaped like an H, available as a hot-rolled section. A box column is a closed, rectangular section assembled and welded from steel plates, with internal diaphragms where required.
2. How They Behave Under Load
The open H-section bends efficiently in its strong axis and is relatively light, suiting members loaded mainly in one plane. The closed box section has similar stiffness in both directions and performs better under torsion and biaxial bending, which is why it is used where high rigidity or well-defined two-way loading matters.
3. Typical Applications
- H-beams: columns and roof beams in single-storey plants, beams and columns in multi-storey frames, and connection members such as purlins and bracing.
- Box columns: perimeter columns in high-rise and super high-rise buildings, long-span or heavily loaded members, and members sensitive to torsion and biaxial bending.
4. A Checklist for Choosing
- Loading direction: mainly uniaxial bending, or biaxial with noticeable torsion.
- Connections: moment or pin type for beam-column and column-base joints, as the section affects detailing.
- Material and fabrication: open hot-rolled sections are easy to procure, while closed box columns are welded members requiring plate thickness and welding review.
- Corrosion protection: for closed sections, internal surface protection and sealing requirements should be agreed in advance.
5. What to Prepare Before Choosing
Prepare the structural layout, column grid plan, loading values, member elevations and connection details, and state the design standard; final sections and sizes are confirmed against drawings and project review.
To review what we can supply, see our H-beam steel page and box column page. If you have drawings, send them to us for a manufacturability review and quote.