Bridges

Painted plain carbon steel cross bracing supplemented by a cathodic protection system is often used for pier strengthening works. Effective use of plain carbon steel requires skilful paint application, bespoke cathodic protection system design, uninterrupted power supply, frequent inspections, routine maintenance, and periodic repair or replacement.

In remote locations, where the reliability of power supply is questionable, and regular inspections are challenging, cross bracing of an appropriate grade of stainless steel provides a sustainable alternative. Stainless steel cross bracing can reduce inspections and minimise maintenance when correctly designed, fabricated and installed. In addition, it is possible to standardize stainless steel grades and fabrication practices for cross bracing irrespective of the geographical location in Australia.

Duplex stainless steel bracing and super duplex stainless steel fasteners were designed, fabricated, and installed for the pier strengthening works for a bridge in the tidal zone of the Richmond river system in Northern NSW.

This paper describes durability aspects that should be considered when selecting stainless steel cross bracings and difficulties in fabrication that should be addressed. It is envisaged that this paper will provide helpful information to bridge design engineers and asset managers.