ISO 8930:2021

Overview

ISO 8930:2021, titled General principles on reliability for structures - Vocabulary, is an international standard published by the International Organization for Standardization (ISO). It establishes a unified and comprehensive vocabulary of essential terms used in the reliability assessment and design of structures. This standard serves as a foundational reference for professionals working within ISO Technical Committee 98 (TC98) related to structural design bases.

The 2021 edition supersedes the 1987 first edition by updating terms to align with the latest developments in structural reliability and incorporating revised definitions from various ISO TC98 documents. ISO 8930:2021 ensures consistency in terminology, enabling clear communication and effective application of reliability concepts in structural engineering practices globally.

Key Topics

ISO 8930:2021 focuses on concepts integral to the reliability of structures and associated design actions, providing precise definitions and explanations for a wide spectrum of terms, including:

• Reliability and Structural Safety The standard clarifies the meaning of reliability as the ability of structures or structural members to fulfill specified safety, serviceability, and durability requirements throughout their service life. It touches on reliability classes, target probabilities of failure, and reliability differentiation for socio-economic optimization.

• Design Service Life and Maintenance Definitions include service life, design service life, life cycle maintenance, and related terminology that describe how a structure is expected to perform over time with planned upkeep but without substantial repairs.

• Assessment, Inspection, and Investigation Terms related to verifying reliability such as assessment, inspection, and investigation are defined to guide correct interpretation in quality control and condition evaluation processes.

• Probabilistic and Deterministic Methods The vocabulary encompasses various calculation methods, including probabilistic methods that treat variables as random, deterministic methods using fixed values, and reliability-based design approaches incorporating partial factors and code calibration.

• Structural Terms and Components Precise definitions of components, structural members, systems, and elements like spans, parapets, pipelines, and cultural or heritage structures are included. This helps unify structural engineering language across different contexts.

• Performance Indicators and Objectives The standard outlines terms for describing structural performance criteria and objectives, essential for evaluating how a structure meets expected functional and safety demands.

• Robustness and Damage Insensitivity Defined concepts cover a structure’s ability to withstand unforeseen events such as fire, explosion or human errors without excessive damage relative to the cause, enhancing resilience considerations in design.

Applications

ISO 8930:2021 is an invaluable resource for:

• Structural Engineers and Designers Facilitates consistent application of reliability principles and terminology in the design of safe, durable, and efficient structures.

• Standards Development Committees Ensures harmonized language usage across ISO and related technical documents, improving clarity in regulations and guidelines.

• Construction and Quality Control Professionals Supports reliable assessment, inspection, and maintenance practices by providing standardized definitions of key terms.

• Academia and Research Provides a solid vocabulary backbone for research and education focused on structural reliability, risk assessment, and sustainable construction.

• Regulators and Authorities A reference for adopting uniform standards and enhancing compliance monitoring in the construction sector.

Related Standards

ISO 8930:2021 complements and aligns with numerous other standards, particularly within the ISO TC98 framework, such as:

• ISO 2394:2015 – General principles on reliability for structures (provides foundational principles and terminology revised in ISO 8930).

• ISO 13822:2010 – Bases for design of structures – Assessment of existing structures (includes heritage structures terminology).

• ISO 23469:2005 – Bases for design of structures – Geotechnical design (includes relevant geotechnical terms).

• ISO 12491:1997 – Bases for design of structures related to terminology and symbols.

Professionals are encouraged to consult these and related documents to fully understand and apply the vocabulary within the broader context of structural design and reliability methodologies.

Keywords: ISO 8930:2021, structural reliability vocabulary, reliability of structures, design service life, structural safety, ISO TC98, reliability assessment, construction standards, probabilistic design, structural engineering terminology, robustness in structures, structural performance criteria, reliability-based design, structural maintenance.