Standards Development

Scope

This document specifies the test methods for determining the mechanical characteristics of large size elastomeric seismic protection isolators subjected to dynamic velocity loading representative of seismic actions. The isolators covered by this document consist of multilayered vulcanized rubber sheets and reinforcing steel plates, as defined in ISO 22762 1.

The test methods include the application of horizontal dynamic loading, with or without simultaneous vertical loading, in order to evaluate:

— shear properties under dynamic velocities;

— vertical load bearing performance under dynamic conditions;

— large deformation behaviour;

— ultimate shear properties, including breaking, buckling, and roll out displacement.

These methods are intended for test pieces of dimensions representative of isolators used in actual structures (hereafter “large size isolators”). The tests are applicable to isolators used in buildings, bridges and other structures requiring evaluation under seismic level dynamic loading.

This document is intended to be used in conjunction with ISO 22762 1, which specifies general test methods for elastomeric isolators, and with ISO 22762 2, ISO 22762 3, or ISO 22762 which specify design related requirements for isolators used in bridges and buildings, respectively.

This document does not specify the design requirements of isolators, nor the criteria for their acceptance in specific structural applications. These matters are specified in ISO 22762 2, ISO 22762 3, and ISO 22762-6.

Purpose

The purpose of this document is to establish internationally harmonized dynamic loading test methods for large-size elastomeric seismic-protection isolators used in buildings, bridges, and other structures. While existing parts of ISO 22762 specify general test methods and design-related requirements, they do not adequately address dynamic velocity loading conditions and large deformation behaviours that are representative of actual seismic actions for large-size isolators.

With the advancement of seismic isolation technologies, evaluation techniques for isolator characteristics have also evolved. In many countries where seismic isolation is widely adopted, largesize dynamic loading tests have become common practice in both engineering applications and research and development. However, the lack of standardized dynamic test methods has led to variations in testing practices among countries and laboratories, making it difficult to consistently evaluate performance, compare results, and ensure reliability under seismic conditions.

In response to this background, the development of this new part is necessary to provide clear, reproducible, and technically sound dynamic testing methods for large-size isolators. This document aims to fill the existing gap, thereby enhancing structural safety, supporting technological development, facilitating international trade, and promoting consistent global application of seismic isolation systems.