ISO 20332:2016

Overview

ISO 20332:2016 - Cranes: Proof of competence of steel structures defines general principles, methods and parameter values for proving the structural competence of crane steelwork using the limit state method. Intended for use together with the loads and load combinations given in ISO 8686, this standard covers cranes of all types and sets out how to demonstrate static strength, fatigue strength and elastic stability of main structural members and their connections by theoretical calculation and/or testing. The aim is to prevent hazards by establishing limits for yield, ultimate, fatigue and brittle fracture performance.

Key Topics

• Limit state method: Proofs use partial safety factors (limit state philosophy); the standard is limited to this approach (it does not adopt the allowable stress method).
• Loads and load combinations: Intended to be applied with ISO 8686 load definitions and combinations.
• Strength checks: Static strength requirements for members and connections (bolted, pinned, welded).
• Fatigue assessment: Methods for determining characteristic fatigue strength, stress histories, cycle frequencies and limit design stress ranges.
• Elastic stability: Buckling and plate-field stability checks for members under compression and shear.
• Connection details: Requirements for bolted (shear, bearing, friction/grip, tension), pinned and welded connections; annexes address weld design stresses and bolt behaviour.
• Documentation & testing: Guidance on required documentation, alternative methods, and when testing is needed to demonstrate competence.
• Scope exclusions: Components of accessories (handrails, stairs, cabins) are not covered for their own competence, though their influence on the main structure must be considered.

Applications and Users

ISO 20332:2016 is practical for:

• Structural and crane design engineers performing proof-of-competence calculations.
• Crane manufacturers and fabricators preparing design verifications and test programs.
• Certification bodies, inspection agencies and regulatory authorities assessing structural safety.
• Test laboratories conducting static, fatigue or fracture tests on crane components.
• Safety managers and asset owners needing documented structural assessments for compliance and risk reduction.

Typical tasks supported: structural member sizing, connection design checks, fatigue life evaluation, buckling assessment, and preparation of verification reports tied to ISO 8686 load cases.

Related Standards

Relevant standards to use with ISO 20332:2016 include:

• ISO 8686 (loads and load combinations for cranes)
• ISO 5817 (weld quality)
• ISO 898-1 (mechanical properties of fasteners)
• ISO 148-1 (Charpy impact testing)
• ISO 4301-1, ISO 4306-1 (crane classification & vocabulary)
• ISO 12100 (safety of machinery - design principles)

Use ISO 20332:2016 when you need a limit-state-based, internationally harmonized framework for proving the competence of crane steel structures.