New NZ Steel Durability Standard

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This new Technical Specification, ‘Durability requirements for steel structures and components’ (SNZ TS 3404:2018) was prepared by Standards New Zealand to give a means of compliance with the durability requirements of the NZ Building Code Clause B2 and the NZ Transport Agency’s Bridge manual.  It both updates and supersedes the corrosion protection requirements in the Steel structures Standard, NZS 3401.1:2009.  It also complements the new structural steel fabrication and bridge design standards, AS/NZS 5131 and AS/NZS 5100.6 respectively, and should be used with the relevant parts of the protective coatings guide, AS/NZS 2312.


TS 3404 mostly covers the corrosion protection of structural steelwork exposed to New Zealand’s different atmospheric environments and includes seven corrosivity zone maps with alternative systems for different corrosivity categories according to the designer’s required life to first major maintenance.  Also covered is the protection of structural steel in common non-atmospheric environments.


This paper discusses the development and details of this specification.

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