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Published byBarry Watkins Modified over 9 years ago
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Bearings and Beam Ends Jeff Naum Maine DOT
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Bridge Nomenclature
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Bearings BEARINGS BEARINGS Components that transfer weight from beams to abutments and piersComponents that transfer weight from beams to abutments and piers BEAM ENDS BEAM ENDS Ends of beams and girders often over a bearingEnds 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 Transmit loads from superstructure to substructure Allow rotation caused by loading Allow rotation caused by loading Allow movements caused by thermal expansion and contraction Allow movements caused by thermal expansion and contraction
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Bearings – Functions
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Main Categories Expansion Bearings Expansion Bearings Allow thermal movementsAllow thermal movements Steel Bridges = 1 ¼” per 100 ftSteel Bridges = 1 ¼” per 100 ft Concrete Bridges = 1” per 100 ftConcrete Bridges = 1” per 100 ft Fixed Bearings Fixed Bearings Restrains movementsRestrains 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: Chosen based on: Length of spanLength of span SkewSkew CostCost
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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 Caused by leaking joint from above Reduced by preservative actions Reduced by preservative actions Rate of Deterioration increased if not cleaned 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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Pedestal Damage
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Repairs May be necessary if capacity is compromised May be necessary if capacity is compromised Costly Costly Have other tasks that could be doing 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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New Sharon – Sandy River
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Structural Rehabilitation
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Old Town – Stillwater #2
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Preservation Essential in getting the most life out of bridges Essential in getting the most life out of bridges Easy to do Easy to do Relatively inexpensive Relatively inexpensive Starts with sealing the joint 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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Paint Weathering Steel
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