Overview
ISO/TS 22762-4:2019 - "Elastomeric seismic‑protection isolators - Part 4: Guidance on the application of ISO 22762‑3" is a Technical Specification published by ISO that provides practical guidance for applying ISO 22762‑3:2018 (applications for buildings). It supplements the specifications in Part 3 by supplying worked examples, scaled test-piece illustrations, design‑calculation guidance and measured characteristic data for all types of elastomeric isolators used in seismic isolation.
Key topics
- Guidance scope and structure - Explanatory guidance mapped to Clauses 4–11 of ISO 22762‑3, with substantive detail for Clauses 6 and 7 (testing, performance and stiffness).
- Type and routine tests - Examples of scaled test pieces (scales A and B), acceptable dimensional tolerances (±5 %), and recommended numbers of test pieces per property (commonly 3; durability tests example uses 2).
- Performance requirements - Worked examples for compressive, shear and tensile properties (HDR, LNR, LRB types are addressed). Includes example test conditions (cycle counts, strain amplitudes, frequency correction methods) and post‑test result processing guidance.
- Dependencies and capacities - Guidance on shear‑strain dependency, compressive stress dependency, shear displacement capacity and durability assessment.
- Design parameters - Recommendations for specifying design compressive force and nominal stress (σnom), including guidance that σnom be less than 30 % of critical stress and generally ≤ 15 MPa, and verification of compressive‑stress dependency.
- Compressive stiffness - Practical examples for computing compressive stiffness for different isolator types and for laboratory reference temperatures (note: second edition changed reference temperature to 23 °C).
Applications
ISO/TS 22762‑4:2019 is intended for:
- Design engineers and structural specialists specifying elastomeric seismic isolators for buildings
- Testing laboratories and manufacturers performing type or routine tests and producing characteristic data
- Code authorities and reviewers assessing isolator selection, test evidence, and compliance with ISO 22762 series requirements
Practical use cases include selecting isolator dimensions, scaling test specimens, interpreting shear/compressive test data, and documenting performance for building isolation systems.
Related standards
- ISO 22762‑3:2018 - Elastomeric seismic‑protection isolators - Part 3: Applications for buildings - Specifications (primary normative reference)
- ISO 22762‑1:2018 - Part 1: Test methods (test procedures referenced by Part 4)
Keywords: ISO/TS 22762-4:2019, elastomeric seismic-protection isolators, guidance, ISO 22762-3, shear properties, compressive properties, design compressive force, test methods, seismic isolators, durability.