How Should Bolted Connections Be Designed for Corten Steel?

1. Selecting Compatible Fasteners

When designing bolted connections for Corten steel, it is crucial to use fasteners that are corrosion-compatible. Stainless steel or weathering steel bolts prevent galvanic corrosion and ensure the connection maintains structural integrity over time.

2. Allowing for Patina Formation

Connections should allow the natural patina to develop around bolts without trapping moisture. Avoid tight cavities where water or debris can accumulate, as this can slow patina stabilization and create localized corrosion points.

3. Pre-Drilled Holes and Proper Tolerances

Drilling holes to precise tolerances prevents stress concentration around bolt holes. Proper clearance ensures that bolts do not impede the steel's natural expansion and contraction, helping maintain the steel's long-term strength and durability.

4. Design for Maintenance and Inspection

Bolted connections should be accessible for periodic inspection, even though weathering steel is low-maintenance. Ensuring that joints are visible and debris-free helps verify that the protective patina is functioning correctly, providing long-lasting performance and safety for bridges, facades, and outdoor structures.