Bearings and Beam Ends - Amazon Web Services · Bearings •BEARINGS •Components that transfer...
Transcript of Bearings and Beam Ends - Amazon Web Services · Bearings •BEARINGS •Components that transfer...
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Bearings and
Beam Ends
Jeff Naum
Maine DOT
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Bridge
Nomenclature
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Bearings
• BEARINGS
• Components that transfer weight
from beams to abutments and piers
• BEAM ENDS
• Ends of beams and girders often
over a bearing
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Bearings at Abutments
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At Abutments and Piers
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One Row of Bearings
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Two Rows of Bearings
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Bearings – Functions
• Transmit loads from
superstructure to substructure
• Allow rotation caused by loading
• Allow movements caused by
thermal expansion and
contraction
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Bearings – Functions
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Main Categories
• Expansion Bearings
• Allow thermal movements
• Steel Bridges = 1 ¼” per 100 ft
• Concrete Bridges = 1” per 100 ft
• Fixed Bearings
• Restrains movements
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Fixed Bearing
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Expansion Bearing
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Bearing Components
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Types of Bearings
• Chosen based on:
• Length of span
• Skew
• Cost
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Sliding Plate Bearings
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Rocker Bearing
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Elastomeric Bearings
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Pot Bearings
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Damage and Deterioration
• Caused by leaking joint from
above
• Reduced by preservative actions
• Rate of Deterioration increased if
not cleaned
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Pin Wear
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Anchor Bolt
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Beam End Corrosion
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Beam End Corrosion
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Pedestal Damage
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Repairs
• May be necessary if capacity is
compromised
• Costly
• Have other tasks that could be
doing
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Block Up
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Refurbish
Bearings
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Jacking Up Bearings
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Jacking Up Bearings
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New Sharon – Sandy River
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New Sharon – Sandy River
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Structural
Rehabilitation
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Old Town – Stillwater #2
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Old Town – Stillwater #2
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Preservation
• Essential in getting the most life out of bridges
• Easy to do
• Relatively inexpensive
• Starts with sealing the joint
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Bridge Cleaning and Washing
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Fluid Film
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Paint
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West Gardiner - Tappan
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West Gardiner - Tappan
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Paint Weathering Steel