Eurocodes for the assessment of the existing structures

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ICE Coventry & Warwickshire Event: “Eurocodes: Are you being left behind?”

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Eurocodes for the assessment of the existing structures

  1. 1. Eurocodes for the assessment of theexisting structures.RWS Managing Contractor
  2. 2. Agenda: 1. Introduction Bridges Defects Proposed Solution 2. Use of Eurocodes in Assessment. Lane arrangement Load Factors Reduction Factors2
  3. 3. Introduction Joint Venture : Royal Haskoning, Arup, Greisch Client : Rijkwaterstaat 8 Major bridges in the Netherlands fatigue and strength issues Renovation over an 8 year programme To give 30 yrs. further useful life. Concrete overlay already decided solution for fatigue3
  4. 4. Bridges4
  5. 5. • Waalbrug Ewijk5
  6. 6. • Waalbrug Ewijk6
  7. 7. Defects Orthotropic Decks Fatigue Problems7
  8. 8. 8
  9. 9. 9
  10. 10. Proposed Solution10
  11. 11. 11
  12. 12. Eurocodes National Design Annexes Memos12
  13. 13. Eurocodes used for the assessment: Eurocode 0: Basis of structural design - NEN1990 Eurocode 1: Action on the structures - NEN1991 Eurocode 2: Design of concrete structures - NEN1992 Eurocode 3: Design of steel structures - NEN1993 Eurocode 4: Design of composite steel and concrete structures - NEN199413
  14. 14. Lane arrangement on the bridge:14
  15. 15. Lane arrangement on the bridge: 12.25 m 12.25 m 3.0 m 3.0 m 3.0 m 3.0 m 3.0 m 3.0 m 3.0 m 3.0 m 3.0 m 3.0 m 3.0 m 3.0 m 3.0 m 3.0 m15
  16. 16. Load Factors:16
  17. 17. Load Factors: Action Default values Dutch National Modified values for from Eurocode Annex assessment Permanent Load 1.35 1.5 1.25 (6.10a) 1.10 (6.10b) Variable Traffic 1.35 1.5 1.10 (6.10a) Load 1.25 (6.10b) Other Variable Load 1.5 1.65 1.2 (6.10a) 1.5 (6.10b)17
  18. 18. Reduction factors. Shortening of the reference design life Trend reduction in load magnitude18
  19. 19. Shortening of the reference design life: 1.0 0.96 Reference period Reduction factor 100 years 1.00 15 years 0.95 1.0 years 0.88 Month 0.8219
  20. 20. Trend reduction in live load magnitude: Influence 2000 2010 2020 2030 2040 2050 length L [m] 0 1.00 1.00 1.00 1.00 1.00 1.00 20 0.89 0.91 0.93 0.96 0.98 1.00 50 0.82 0.86 0.89 0.93 0.96 1.00 75 0.78 0.83 0.87 0.91 0.96 1.00 100 0.76 0.81 0.85 0.90 0.95 1.00 150 0.75 0.80 0.85 0.90 0.95 1.00 200 0.75 0.80 0.85 0.90 0.95 1.0020
  21. 21. Trend reduction in live load magnitude: 30 years Influence 2000 2010 2020 2030 2040 2050 length L [m] 0 1.00 1.00 1.00 1.00 1.00 1.00 20 0.89 0.91 0.93 0.96 0.98 1.00 50 0.82 0.86 0.89 0.93 0.96 1.00 75 0.78 0.83 0.87 0.91 0.96 1.00 100 0.76 0.81 0.85 0.90 0.95 1.00 150 0.75 0.80 0.85 0.90 0.95 1.00 200 0.75 0.80 0.85 0.90 0.95 1.0021
  22. 22. Reduction factors. Shortening of the reference design life Trend reduction in load magnitude DL+0.96 x 0.95 x LL22
  23. 23. Thank You23

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