Post on 07-Mar-2021
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Elastomeric Bearing Design
Example
Elastomeric Bearing Design
Example (cont’d.)
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Elastomeric Bearing Design
Example (cont’d.)
Elastomeric Bearing Design
Example (cont’d.)
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Elastomeric Bearing Design
Example (cont’d.)
Loading Data:
Elastomeric Bearing Design
Example (cont’d.)
Design Loads:
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Elastomeric Bearing Design
Example (cont’d.)
Corrected for Skew:
mgr = rskew x mg
where,
rskew = Correction Factor for Skew
mg = Uncorrected Distribution
Factor neglecting skew 826.0MI
VmgUncorrected Distribution Factor =
For Shear, Interior Beams
762.0SE
VmgUncorrected Distribution Factor =
For Shear, Exterior Beams
746.0MI
MmgUncorrected Distribution Factor =
For Moment, Interior Beams
762.0SE
MmgUncorrected Distribution Factor =
For Moment, Exterior Beams
Elastomeric Bearing Design
Example (cont’d.)
Correction Factor for Skew:
For skewed bridges the Distribution Factor for Shear may be modified by
multiplying it with a Modification Factor given as: [A4.6.2.2.3 c-1]
tan2.00.1
3.03
Kg
Ltsrskew
o30
0.13
Kg
Lts
115.1)577.0(0.12.00.13.0
skewr
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Elastomeric Bearing Design
Example (cont’d.)
Correction Factor for Moment:
For skewed bridges the Distribution Factor for Moment may be modified by
multiplying it with a Modification Factor given as: [A4.6.2.2.2 e]
5.025.0
31
5.1
1
25.0
)(tan0.1
L
S
Lts
Kgc
crskew o30
mmSmmLLts
Kg2440,670,10,0.1
3
948.0)30(tan0.1 5.1
1 crskew
12.010670
2400125.0
5.0
25.0
1
xxc
Elastomeric Bearing Design
Example (cont’d.)
Modified Distribution Factors for Shear and Moment:
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Elastomeric Bearing Design
Example (cont’d.)
Bearing Load Calculation:
Elastomeric Bearing Design
Example (cont’d.)
Bearing Load Calculation: (cont’d.)
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Elastomeric Bearing Design
Example (cont’d.)
Bearing Load Calculation: (cont’d.)
Elastomeric Bearing Design
Example (cont’d.)
Maximum Longitudinal Movement at the Abutment
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Elastomeric Bearing Design
Example (cont’d.)
Maximum Longitudinal Movement at the Abutment (cont’d.)
Elastomeric Bearing Design
Example (cont’d.)
Maximum Longitudinal Movement at the Abutment (cont’d.)
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Elastomeric Bearing Design
Example (cont’d.)
Maximum Longitudinal Movement at the Abutment (cont’d.)
Elastomeric Bearing Design
Example (cont’d.)
Preliminary Thickness of Bearing
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Elastomeric Bearing Design
Example (cont’d.)
Preliminary Pad Area
Elastomeric Bearing Design
Example (cont’d.)
Preliminary Thickness of Bearing (cont’d.)
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Elastomeric Bearing Design
Example (cont’d.)
Preliminary Thickness of Bearing (cont’d.)
Elastomeric Bearing Design
Example (cont’d.)
Preliminary Thickness of Bearing (cont’d.)
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Elastomeric Bearing Design
Example (cont’d.)
Preliminary Thickness of Bearing (cont’d.)
Elastomeric Bearing Design
Example (cont’d.)
Check Stresses in Trial Bearing Size
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Elastomeric Bearing Design
Example (cont’d.)
Instantaneous Compressive Deflection
Elastomeric Bearing Design
Example (cont’d.)
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Elastomeric Bearing Design
Example (cont’d.)
Rotation Capacity of Bearing
Elastomeric Bearing Design
Example (cont’d.)
Rotation Capacity of Bearing (cont’d.)
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Elastomeric Bearing Design
Example (cont’d.)
Rotation Capacity of Bearing (cont’d.)
Elastomeric Bearing Design
Example (cont’d.)
Rotation Capacity of Bearing (cont’d.)
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Elastomeric Bearing Design
Example (cont’d.)
Rotation Capacity of Bearing (cont’d.)
Elastomeric Bearing Design
Example (cont’d.)
Rotation Capacity of Bearing (cont’d.)
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Elastomeric Bearing Design
Example (cont’d.)
Rotation Capacity of Bearing (cont’d.)
Elastomeric Bearing Design
Example (cont’d.)
Rotation Capacity of Bearing (cont’d.)
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Elastomeric Bearing Design
Example (cont’d.)
Elastomeric Bearing Design
Example (cont’d.)
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Elastomeric Bearing Design
Example (cont’d.)
Elastomeric Bearing Design
Example (cont’d.)
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Elastomeric Bearing Design
Example (cont’d.)
Elastomeric Bearing Design
Example (cont’d.)
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Elastomeric Bearing Design
Example (cont’d.)
Elastomeric Bearing Design
Example (cont’d.)
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Elastomeric Bearing Design
Example (cont’d.)
Elastomeric Bearing Design
Example (cont’d.)
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Elastomeric Bearing Design
Example (cont’d.)
7mm 0.6mm
L = 240 mm
62.4mm
15mm
FINAL DESIGN