Steel Tie Rods: The Invisible Force Keeping Your Building Frame Straight

Steel tie rods are the horizontal members that link columns and roof trusses along the building length — they look simple, but without them, a steel frame would rack sideways in wind or seismic load. Below is member XG-18 from an actual fabrication drawing.

Basic Specs

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Construction Details

The tie rod is a circular steel tube with welded end plates:

• Tube: O152×5, 7,539 mm long, 135.1 kg
• End plates: PL10×290×290, 2 pcs (one per end)
• Stiffeners: PL10×290×100, 2 pcs at each tube-to-plate weld
• Weld: tube end beveled, full penetration groove weld
• Bolts: 2×M20 per end, pitch 105 mm, edge distance 40 mm

Advantages

1. Lightweight — 18 kg/m circular tube is far lighter than angle or flat-bar ties
2. Both-axis symmetry — circular section has equal radius of gyration in all directions
3. Clean appearance — round tube fits exposed steel architecture, no sharp edges
4. Simple bolted connection — end plate bolts to column gusset, no site welding
5. Cost efficient — standard steel pipe, readily available, low material cost

Disadvantages / Limitations

1. Axial load only — designed for tension or compression, not bending
2. Buckling in compression — long unsupported lengths may buckle under compression
3. Less rigid than solid bar — flexible compared to solid round bar for same weight
4. Weld inspection needed — tube-to-end-plate weld requires visual or ultrasonic check
5. Not for heavy lateral loads — needs to work alongside diagonal bracing​​​​​​​

Typical Applications

1. Roof longitudinal bracing — connects row of roof trusses at ridge or eave
2. Column top ties — links column tops along building length, prevents racking
3. Gable beam ties — connects wind columns to roof structure
4. Crane beam support ties — stabilizes crane beams laterally
5. Platform & walkway rails — horizontal tie between vertical posts

Installation Notes

• End plate bolted to column or truss gusset plate
• Tube beveled at ends for full penetration weld to end plate
• Field connection is bolted — no welding on site
• Tighten bolts to specified torque after alignment
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