1. Bearings and Beam Ends Jeff Naum Maine DOT

2. Bridge Nomenclature

5. 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

6. Bearings at Abutments

7. At Abutments and Piers

8. One Row of Bearings

9. Two Rows of Bearings

10. 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

11. Bearings – Functions

12. 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

13. Fixed Bearing

14. Expansion Bearing

15. Bearing Components

16. Types of Bearings Chosen based on: Chosen based on: Length of spanLength of span SkewSkew CostCost

17. Sliding Plate Bearings

18. Rocker Bearing

19. Elastomeric Bearings

20. Pot Bearings

21. 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

22. Pin Wear

23. Anchor Bolt

24. Beam End Corrosion

26. Pedestal Damage

27. 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

28. Block Up

29. Refurbish Bearings

30. Jacking Up Bearings

32. New Sharon – Sandy River

34. Structural Rehabilitation

35. Old Town – Stillwater #2

37. 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

38. Bridge Cleaning and Washing

39. Fluid Film

43. Paint

45. West Gardiner - Tappan

47. Paint Weathering Steel