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This specification provides design provisions for I-girder bridge superstructures fabricated from duplex stainless steel. While focused on I-girder bridges, the provisions may be adapted for other bridge types by considering the distinct buckling behaviour and increased flexibility of duplex stainless-steel members.

This publication is one of a unified set of specifications developed for duplex stainless steel plate girder bridges. Based on the framework of AASHTO M 270M/M 270 (ASTM A709/A709M), the specification establishes the material requirements for duplex stainless steel plates used in bridge construction.

Held on 6 and 7 May in Rotterdam, Duplex World Conference 2026 is a meeting ground for professionals working in the duplex stainless steel supply chain to address key issues in from design and manufacture, through purchasing to usage and maintenance.

A spectacular footbridge along Cornwall’s rugged coast replaces a lost land link and reconnects the two halves of Tintagel Castle, one of Britain’s most legendary historic sites.