Abstract
In recent years, various types of elastomeric isolators are used for seismic isolated buildings globally. International standards for elastomeric seismic-protection isolators, ISO 22762 were first developed in 2005, and this standard has been revised through a systematic review to issue the 3rd edition now (3rd edition was issued in October 2018). This paper describes breaking test results of elastomeric isolators to investigate the ultimate property (breaking limit) of isolators used for buildings around the world. Shear displacement capacity is one of the most important parameters of elastomeric isolators, and these tests results are useful for our proposal of the introduction of a classification system (classification of isolators according to their performance) to ISO 22762 in the near future. Breaking tests were carried out on 11 isolators produced in five countries. The isolators having diameters of around 800 mm, and the total rubber heights of around 160 mm were tested with increasing shear strain under constant compressive stress using a multi-axial testing system. The breaking shear strain was distributed between 300 and 450% or more.
Highlights
Seismic isolation is an aseismic design concept to reduce the seismic force transmitted to the structures by supporting with a flexible element at the base or sometimes middle story of the buildings, to elongate the natural period of the structure and thereby decouples it from the ground
To keep abreast with new developments, the revised version of ISO 22762 was published as the 2nd edition in November 2010 and currently, the standard is being revised through systematic review to issue the 3rd edition (3rd edition was issued in October 2018)
In considering the future of ISO 22762, it seems very important that a classification system which identifies the difference in performance of elastomeric isolators is introduced to the standard and we propose to introduce this system
Summary
The elastomeric isolator, made up with layers of alternating rubber and steel plates, as shown in Fig. 1, is the most popular device to satisfy the above requirements. The elastomeric isolator, made up with layers of alternating rubber and steel plates, as shown, is the most popular device to satisfy the above requirements. 11 elastomeric isolators were collected from China, Italy, Japan, Malaysia and the United States. Do outer diameter of isolator, Di inner diameter of isolator, Dp diameter of lead plug, G shear modulus of rubber (at 100% shear strain), S1 first shape factor, S2 second shape factor, σ0 nominal compressive stress.
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