Elastomeric Laminated Bearing pads are fabricated of natural rubber or neoprene. It is designed and sized to transmit the necessary loads and flexible enough to permit the rotation and movement required by the structure. They can also be used for vibration and earthquake motion control applications.

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Types

Property

Property of rubber

Characteristics		Requirements
Characteristics		CR	NR
Hardness		60±5	60±5
Tensile strength / MPa		17.0	18.0
Elongation at break / %		400	450
Brittle temperature ℃		-40	-50
Compression set %		15	30
Ozone resistanceElongation: 20% Temperature: 40℃		100x10 -8	25x10 -8
Ozone resistanceElongation: 20% Temperature: 40℃		No crack	No crack
Accelerated aging	Condition ℃x h	100x70	70x168
	Elongation Strengthchange rate % ≤	15	15
	Tensile Strengthchange rate % ≤	40	20
	Hardness change	0-10	-5-10
Bond strength of elastomer and steel		10	10
Bond strength of elastomer and PTFE		7	7

Performance requirements of Complete bearings

Item		Index
Ultimate compression strength Rd /MPa		≥70
Compression modulus of elasticity E1/ MPa		E±Ex30%
Shear modulus of elasticity G1 / MPa		G±Gx15%
Shear modulus of elasticity after aging G2 / MPa		G1±G1x15%
Tangent angle tan A	Concrete bridge	≥1/300
	Steel bridge	≥1/500
Friction coefficient for elastomer and steel μ with silicone grease		≤0.03

Plate type bearings compression modulus of elasticity E

And bearing form factor S should be calculated as : E=5.4GS 2

E- plate bearing compression modulus, MPa

G - plate bearing shear modulus, MPa

S - plate bearing form factor

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Types

Property