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Bearings and Beam Ends Jeff Naum Maine DOT
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Bearings and Beam Ends - Amazon Web Services · Bearings •BEARINGS •Components that transfer weight from beams to abutments and piers •BEAM ENDS •Ends of beams and girders

May 10, 2020

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Page 1: Bearings and Beam Ends - Amazon Web Services · Bearings •BEARINGS •Components that transfer weight from beams to abutments and piers •BEAM ENDS •Ends of beams and girders

Bearings and

Beam Ends

Jeff Naum

Maine DOT

Page 2: Bearings and Beam Ends - Amazon Web Services · Bearings •BEARINGS •Components that transfer weight from beams to abutments and piers •BEAM ENDS •Ends of beams and girders

Bridge

Nomenclature

Page 3: Bearings and Beam Ends - Amazon Web Services · Bearings •BEARINGS •Components that transfer weight from beams to abutments and piers •BEAM ENDS •Ends of beams and girders
Page 4: Bearings and Beam Ends - Amazon Web Services · Bearings •BEARINGS •Components that transfer weight from beams to abutments and piers •BEAM ENDS •Ends of beams and girders
Page 5: Bearings and Beam Ends - Amazon Web Services · Bearings •BEARINGS •Components that transfer weight from beams to abutments and piers •BEAM ENDS •Ends of beams and girders

Bearings

• BEARINGS

• Components that transfer weight

from beams to abutments and piers

• BEAM ENDS

• Ends of beams and girders often

over a bearing

Page 6: Bearings and Beam Ends - Amazon Web Services · Bearings •BEARINGS •Components that transfer weight from beams to abutments and piers •BEAM ENDS •Ends of beams and girders

Bearings at Abutments

Page 7: Bearings and Beam Ends - Amazon Web Services · Bearings •BEARINGS •Components that transfer weight from beams to abutments and piers •BEAM ENDS •Ends of beams and girders

At Abutments and Piers

Page 8: Bearings and Beam Ends - Amazon Web Services · Bearings •BEARINGS •Components that transfer weight from beams to abutments and piers •BEAM ENDS •Ends of beams and girders

One Row of Bearings

Page 9: Bearings and Beam Ends - Amazon Web Services · Bearings •BEARINGS •Components that transfer weight from beams to abutments and piers •BEAM ENDS •Ends of beams and girders

Two Rows of Bearings

Page 10: Bearings and Beam Ends - Amazon Web Services · Bearings •BEARINGS •Components that transfer weight from beams to abutments and piers •BEAM ENDS •Ends of beams and girders

Bearings – Functions

• Transmit loads from

superstructure to substructure

• Allow rotation caused by loading

• Allow movements caused by

thermal expansion and

contraction

Page 11: Bearings and Beam Ends - Amazon Web Services · Bearings •BEARINGS •Components that transfer weight from beams to abutments and piers •BEAM ENDS •Ends of beams and girders

Bearings – Functions

Page 12: Bearings and Beam Ends - Amazon Web Services · Bearings •BEARINGS •Components that transfer weight from beams to abutments and piers •BEAM ENDS •Ends of beams and girders

Main Categories

• Expansion Bearings

• Allow thermal movements

• Steel Bridges = 1 ¼” per 100 ft

• Concrete Bridges = 1” per 100 ft

• Fixed Bearings

• Restrains movements

Page 13: Bearings and Beam Ends - Amazon Web Services · Bearings •BEARINGS •Components that transfer weight from beams to abutments and piers •BEAM ENDS •Ends of beams and girders

Fixed Bearing

Page 14: Bearings and Beam Ends - Amazon Web Services · Bearings •BEARINGS •Components that transfer weight from beams to abutments and piers •BEAM ENDS •Ends of beams and girders

Expansion Bearing

Page 15: Bearings and Beam Ends - Amazon Web Services · Bearings •BEARINGS •Components that transfer weight from beams to abutments and piers •BEAM ENDS •Ends of beams and girders

Bearing Components

Page 16: Bearings and Beam Ends - Amazon Web Services · Bearings •BEARINGS •Components that transfer weight from beams to abutments and piers •BEAM ENDS •Ends of beams and girders

Types of Bearings

• Chosen based on:

• Length of span

• Skew

• Cost

Page 17: Bearings and Beam Ends - Amazon Web Services · Bearings •BEARINGS •Components that transfer weight from beams to abutments and piers •BEAM ENDS •Ends of beams and girders

Sliding Plate Bearings

Page 18: Bearings and Beam Ends - Amazon Web Services · Bearings •BEARINGS •Components that transfer weight from beams to abutments and piers •BEAM ENDS •Ends of beams and girders

Rocker Bearing

Page 19: Bearings and Beam Ends - Amazon Web Services · Bearings •BEARINGS •Components that transfer weight from beams to abutments and piers •BEAM ENDS •Ends of beams and girders

Elastomeric Bearings

Page 20: Bearings and Beam Ends - Amazon Web Services · Bearings •BEARINGS •Components that transfer weight from beams to abutments and piers •BEAM ENDS •Ends of beams and girders

Pot Bearings

Page 21: Bearings and Beam Ends - Amazon Web Services · Bearings •BEARINGS •Components that transfer weight from beams to abutments and piers •BEAM ENDS •Ends of beams and girders

Damage and Deterioration

• Caused by leaking joint from

above

• Reduced by preservative actions

• Rate of Deterioration increased if

not cleaned

Page 22: Bearings and Beam Ends - Amazon Web Services · Bearings •BEARINGS •Components that transfer weight from beams to abutments and piers •BEAM ENDS •Ends of beams and girders

Pin Wear

Page 23: Bearings and Beam Ends - Amazon Web Services · Bearings •BEARINGS •Components that transfer weight from beams to abutments and piers •BEAM ENDS •Ends of beams and girders

Anchor Bolt

Page 24: Bearings and Beam Ends - Amazon Web Services · Bearings •BEARINGS •Components that transfer weight from beams to abutments and piers •BEAM ENDS •Ends of beams and girders

Beam End Corrosion

Page 25: Bearings and Beam Ends - Amazon Web Services · Bearings •BEARINGS •Components that transfer weight from beams to abutments and piers •BEAM ENDS •Ends of beams and girders

Beam End Corrosion

Page 26: Bearings and Beam Ends - Amazon Web Services · Bearings •BEARINGS •Components that transfer weight from beams to abutments and piers •BEAM ENDS •Ends of beams and girders

Pedestal Damage

Page 27: Bearings and Beam Ends - Amazon Web Services · Bearings •BEARINGS •Components that transfer weight from beams to abutments and piers •BEAM ENDS •Ends of beams and girders

Repairs

• May be necessary if capacity is

compromised

• Costly

• Have other tasks that could be

doing

Page 28: Bearings and Beam Ends - Amazon Web Services · Bearings •BEARINGS •Components that transfer weight from beams to abutments and piers •BEAM ENDS •Ends of beams and girders

Block Up

Page 29: Bearings and Beam Ends - Amazon Web Services · Bearings •BEARINGS •Components that transfer weight from beams to abutments and piers •BEAM ENDS •Ends of beams and girders

Refurbish

Bearings

Page 30: Bearings and Beam Ends - Amazon Web Services · Bearings •BEARINGS •Components that transfer weight from beams to abutments and piers •BEAM ENDS •Ends of beams and girders

Jacking Up Bearings

Page 31: Bearings and Beam Ends - Amazon Web Services · Bearings •BEARINGS •Components that transfer weight from beams to abutments and piers •BEAM ENDS •Ends of beams and girders

Jacking Up Bearings

Page 32: Bearings and Beam Ends - Amazon Web Services · Bearings •BEARINGS •Components that transfer weight from beams to abutments and piers •BEAM ENDS •Ends of beams and girders

New Sharon – Sandy River

Page 33: Bearings and Beam Ends - Amazon Web Services · Bearings •BEARINGS •Components that transfer weight from beams to abutments and piers •BEAM ENDS •Ends of beams and girders

New Sharon – Sandy River

Page 34: Bearings and Beam Ends - Amazon Web Services · Bearings •BEARINGS •Components that transfer weight from beams to abutments and piers •BEAM ENDS •Ends of beams and girders

Structural

Rehabilitation

Page 35: Bearings and Beam Ends - Amazon Web Services · Bearings •BEARINGS •Components that transfer weight from beams to abutments and piers •BEAM ENDS •Ends of beams and girders

Old Town – Stillwater #2

Page 36: Bearings and Beam Ends - Amazon Web Services · Bearings •BEARINGS •Components that transfer weight from beams to abutments and piers •BEAM ENDS •Ends of beams and girders

Old Town – Stillwater #2

Page 37: Bearings and Beam Ends - Amazon Web Services · Bearings •BEARINGS •Components that transfer weight from beams to abutments and piers •BEAM ENDS •Ends of beams and girders

Preservation

• Essential in getting the most life out of bridges

• Easy to do

• Relatively inexpensive

• Starts with sealing the joint

Page 38: Bearings and Beam Ends - Amazon Web Services · Bearings •BEARINGS •Components that transfer weight from beams to abutments and piers •BEAM ENDS •Ends of beams and girders

Bridge Cleaning and Washing

Page 39: Bearings and Beam Ends - Amazon Web Services · Bearings •BEARINGS •Components that transfer weight from beams to abutments and piers •BEAM ENDS •Ends of beams and girders

Fluid Film

Page 40: Bearings and Beam Ends - Amazon Web Services · Bearings •BEARINGS •Components that transfer weight from beams to abutments and piers •BEAM ENDS •Ends of beams and girders
Page 41: Bearings and Beam Ends - Amazon Web Services · Bearings •BEARINGS •Components that transfer weight from beams to abutments and piers •BEAM ENDS •Ends of beams and girders
Page 42: Bearings and Beam Ends - Amazon Web Services · Bearings •BEARINGS •Components that transfer weight from beams to abutments and piers •BEAM ENDS •Ends of beams and girders
Page 43: Bearings and Beam Ends - Amazon Web Services · Bearings •BEARINGS •Components that transfer weight from beams to abutments and piers •BEAM ENDS •Ends of beams and girders

Paint

Page 44: Bearings and Beam Ends - Amazon Web Services · Bearings •BEARINGS •Components that transfer weight from beams to abutments and piers •BEAM ENDS •Ends of beams and girders
Page 45: Bearings and Beam Ends - Amazon Web Services · Bearings •BEARINGS •Components that transfer weight from beams to abutments and piers •BEAM ENDS •Ends of beams and girders

West Gardiner - Tappan

Page 46: Bearings and Beam Ends - Amazon Web Services · Bearings •BEARINGS •Components that transfer weight from beams to abutments and piers •BEAM ENDS •Ends of beams and girders

West Gardiner - Tappan

Page 47: Bearings and Beam Ends - Amazon Web Services · Bearings •BEARINGS •Components that transfer weight from beams to abutments and piers •BEAM ENDS •Ends of beams and girders

Paint Weathering Steel