Laminated bearing pad is also called Elastomeric Laminated bearing, which is vulcanized by rubber layers and steel sheets. This type of bearings is highly resistant against vibration and the shocking ...
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description
applications
Laminated bearing pad is also called Elastomeric Laminated bearing, which is vulcanized by rubber layers and steel sheets.
This type of bearings is highly resistant against vibration and the shocking from the moving load to the span and pier of the bridge. It can bear high vertical load and shift the pressure reliably from the superstructure to the piers. Its elasticity is high enough to suit the rotation of the beam end to fit horizontal displacement.
Rectangle Shape Round Shape
Fixed type Movable type
Other shapes in EN1337-3
Physical and mechanical properties of elastomer:
Characteristics
Requirements
CR
NR
EPDM
Hardness
60±5
60±5
60±5
Tensile strength / MPa
17.0
18.0
15.0
Elongation at break / %
400
450
350
Brittle temperature ℃
-40
-50
-60
Compression set %
15
30
25
Ozone resistance
Elongation: 20%
Temperature: 40℃
100x10 -8
25x10 -8
100x10 -8
No crack
No crack
No crack
Accelerated aging
Condition
℃ x h
100x70
70x168
100x70
Elongation Strength
change rate % ≤
15
15
15
Tensile Strength
change rate % ≤
40
20
40
Hardness change
0-10
-5-10
0-10
Bond strength of elastomer and steel
10
10
10
Bond strength of elastomer and PTFE
7
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 agingG2 / MPa
G1±G1x15%
Tangent angle tan A
Concrete bridge
≥1/300
Steel bridge
≥1/500
Friction coefficient for elastomer and steelμ 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