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Stress is good …compressive stress

Stress is good …compressive stress. Eugene Freyssinet. Key People. Milau viaduct Linn Cove viaduct. Offspring of the milestone. Eugene Freyssinet Claude Limousin. Social Drivers. Pont Le Veurdre. Infrastructure Upgrades. Tendon Hardware Box Beams. Technology Residue. Patents,

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Stress is good …compressive stress

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  1. Stress is good…compressive stress Eugene Freyssinet

  2. Key People Milau viaduct Linn Cove viaduct Offspring of the milestone Eugene Freyssinet Claude Limousin Social Drivers Pont Le Veurdre Infrastructure Upgrades Tendon Hardware Box Beams Technology Residue Patents, Success In reinforced concrete Prestressing Technology Drivers Le Veurdre Bridge Close call Process Residue Problem Solving Inspiration

  3. Eugene Freyssinet • Develops prestressing techniques - 1928 • Sees prestressing as a life changing breakthrough

  4. 1919 314’ foot span…unreinforced Pont de la Liberation, Villenuve-sur-Lot, France Photo: sturcturae.DE by Gerrit de Vos

  5. Brick/masonry hybrid Photo: sturcturae.DE by Jacques Mossat

  6. Parallel structures, a trend for life Photo: sturcturae.DE by Jacques Mossat

  7. Orly Dirigible Hangar 1921-23birth of the hollow box-girder?

  8. 156 foot height 282 foot span

  9. Hollow box sections

  10. Thin slabs between box sections

  11. Thin slab form

  12. Hollow Box tubes

  13. Freyssinet’s anchor VSL’s Anchor Prestress principles don’t change much

  14. Stretch cable between flanges to put concrete in compression Grab cable with toothed wedges in conical hubs

  15. 1922 St. Pierre du Vauvre

  16. What keeps roadway from moving?

  17. Elorn River estuary France Hollow box arches Uniform loading by vertical concrete struts…like Telford Plougastel Bridge 1923592 ft span

  18. Floating Formwork

  19. Cable spools?

  20. Freyssinet’s life spans both WW I and WW II Postwar bridge reconstruction keeps him building bridges into the late 1950’s He dies in 1962 World War II survivor

  21. Boutiron Bridge 1924 Freyssinet rides to work over it, realizes the deck is deflecting at the arch centers, Jacks it back up, realizes concrete deflects under load Jacks go in at arch crown to push arches apart, raising them to desired camber to compensate for deadload creep Discovering Creep

  22. 1924 Le Harve Airport Hangars • New machine (airplane) new building type (hangar)

  23. A bridge-roof?

  24. Roof for U-boat harbor 1940 • To fix settling structures Freyssinet retrofits structure with precast prestressed trusses 12 prestressed tendons in bundles of 4 Conduits for tendons ran outside of concrete

  25. Luzancy Bridge 1946180 foot span, hollow box section post tensioned two hinged portal Photo: Structurae.DE, Jacques Mossat

  26. Early box girder bridge

  27. Box girder installation

  28. Still the masters of Prestressing www.freyssinet.com

  29. Linn Cove Viaduct Figg and Mueller, Engineers The last link in the Blue Ridge Parkway For 10 points extra credit on your quiz or final, what is the most direct connection between this project and Freyssinet?

  30. Design for minimum environmental impact

  31. Typical box girder

  32. Usual Box Girder Process

  33. Overhead process doesn’t disrupt the environment

  34. Except for the piers

  35. Box Girder for Linn Cove

  36. Most sections unique shape

  37. Banked curves on uneven terrain

  38. But can you make a building this way? Misericordia church, Brazante, Italy Angelo Mangiarotti, 1957

  39. String the beads

  40. Top and Tie

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