ISO 22762-2:2024

Overview

ISO 22762-2:2024 - Elastomeric seismic-protection isolators: Part 2 - Applications for bridges - Specifications defines minimum requirements and test methods for elastomeric seismic isolators used to protect bridges from earthquake damage. The standard covers isolators made of alternating elastomeric layers and reinforcing steel plates installed between a bridge superstructure and substructure to provide flexibility (structural decoupling) and damping (energy dissipation) at the isolation interface.

Key topics and technical requirements

• Scope and classification
  • Applicability to bridge isolation devices and classification by construction and shear-stiffness tolerances.
• Performance requirements
  • Functional and performance criteria for compressive, shear, rotation and tensile behavior, including shear-displacement capacity and damping characteristics.
• Rubber material requirements
  • Mandatory properties and test methods for rubber used in isolators: tensile properties, ageing, hardness, adhesion, compression set, ozone resistance and other durability metrics.
• Design rules
  • Design guidance including shape factors, compressive and shear stiffness, shear strain evaluation, tensile stress limits, stability checks (buckling/rotation) and design of fixings to the structure.
• Testing and quality assurance
  • Type and routine tests, specific test methods (normative and informative annexes), dimensional and manufacturing tolerances, marking and labelling, and factory quality assurance procedures.
• Annexes
  • Normative annexes for tensile stresses and buckling; informative annexes for determination of shear properties, compressive stiffness and recommended material properties, supporting both design and verification.

Applications and practical value

• Ensures consistent safety, durability and performance of elastomeric seismic isolators for bridges.
• Used when specifying, designing, manufacturing, testing or procuring bridge isolation bearings to meet verifiable international criteria.
• Supports engineers in calculating isolator stiffness, expected displacements, damping, and in verifying stability and attachment details during seismic events.

Who should use this standard

• Bridge and structural engineers designing seismic isolation systems
• Manufacturers of elastomeric seismic isolators and rubber compounds
• Test laboratories performing type and routine tests
• Procurement professionals writing technical specifications for bridge projects
• Authorities and reviewers responsible for bridge seismic safety and compliance

Related standards

• ISO 22762-2:2024 is part of the broader seismic-isolation standards landscape; users should also consult other parts of the ISO 22762 series and applicable national bridge design codes and seismic regulations to ensure full compliance and integration.

Keywords: ISO 22762-2:2024, elastomeric seismic isolators, bridge seismic isolation, rubber material requirements, test methods, design rules, shear stiffness, damping.