ISO 13823:2008

Overview

ISO 13823:2008 - "General principles on the design of structures for durability" - provides high-level, practical guidance for the verification of structural durability under known or foreseeable environmental actions. It establishes a cause‑and‑effect framework linking the structure environment, transfer mechanisms, environmental actions, and action effects that lead to material degradation and potential failure. ISO 13823 integrates durability considerations into the widely used limit‑states design approach (see ISO 2394) and focuses on ensuring reliable performance over the specified design life. (Note: fatigue from cyclic stress is explicitly excluded.)

Key topics and requirements

• Scope and definitions: Clear terminology (e.g., action effect, agent, transfer mechanism, initiation limit state, serviceability and ultimate limit states) to harmonize durability language across standards.
• Basic concepts for verifying durability: Framework for identifying environmental influences, mechanisms that transfer those influences into material agents, and the resulting effects on components.
• Durability requirements: Principles for specifying design life, characteristic service life, and target reliability of structures and components.
• Service‑life prediction methods: Recommended approaches include prediction based on experience, modelling (conceptual and mathematical), and testing.
• Design formats: Use of the partial factor method and limit‑states formats to account for uncertainties and variabilities in basic variables.
• Strategies for durability design: Guidance on maintenance, inspection, repair strategies and considerations of difficulty/cost of replacement and consequences of failure.
• Informative annexes: Practical examples of limit‑states applications, environmental agents, transfer mechanisms, material‑specific actions and recommended procedures for ensuring durability.

Practical applications and users

ISO 13823 is intended for:

• Structural engineers and designers integrating durability into structural design and detailing.
• Asset managers and facility owners planning service life, maintenance and replacement strategies.
• Code writers and standards developers harmonizing durability requirements with limit‑states design.
• Materials scientists and researchers developing predictive models for material degradation.
• Construction and inspection professionals using the framework for risk‑based durability verification.

Typical applications include buildings, bridges and other constructed assets where environmental exposure (corrosion, chloride ingress, moisture, UV, biological attack) can reduce performance over time.

Related standards

• ISO 2394:1998 - General principles on reliability for structures (limit‑states method)
• ISO 15686 (all parts) - Service‑life planning for buildings and constructed assets
• ISO 13822:2001 - Assessment of existing structures
• ISO 3898 / ISO 8930 and national standards (e.g., AS 5604) for material durability ratings

By using ISO 13823:2008, practitioners can better predict service life, set design life targets, and apply consistent, risk‑based durability verification across projects.