Elastomeric Laminated bearings
Elastomeric Laminated bearings
Elastomeric Laminated bearings

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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

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Property

Property of rubber 


Characteristics

Requirements

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  

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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