The Behaviour under Compression of Elastomers Used in Base Isolation Bearings
Tomme: LIX (LXIII) Fascicle: 6 | 2013
Pages: 119-126
Abstract text:
The compression modulus of elastomers used in seismic base isolation depends on the dimensions and the composition of those materials. The paper presents experimental results on the behaviour under compression of four types of elastomers: CR (chloroprene/neoprene rubber) with 64 Shore A hardness; NR (natural rubber) with 65 Shore A hardness; NR/BR (natural rubber/butadiene rubber) with 63 Shore A hardness; NR/BR/SBR+PA/PE Fibres (natural rubber/butadiene rubber/styrene butadiene rubber and polyamide/polyethylene fibres) with 65 Shore A hardness. Elastomeric specimens with a diameter of 28.5 mm and thickness of 13 mm and specimens with a diameter of 28.5 mm and thickness of 13 mm were tested. The compression test was carried out in four situations: in the first case the elastomeric specimens were bonded with epoxy adhesive to metal plates, in the second case the elastomeric specimens were fixed without adhesive on two metal plates, in the third case the specimens have not been provided with plates and in the fourth case a thin layer of lubricant was applied between the elastomeric layer and the test machine plates. The compression modulus of elastomeric specimens was determinated according to SR EN 1337-2006.
Key Words:
elastomer; base isolation; elastomeric bearings; compression modulus.
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