Post-Tensioning Developments in Texas

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The 2014 CTR Symposium featured a keynote panel of leaders in structural engineering from the Ferguson Structural Engineering Laboratory at the University of Texas at Austin. Featuring innovative work done for TxDOT through the years through CTR, Dr. John Breen discussed significant accomplishments.

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Post-Tensioning Developments in Texas

  1. 1. Post-Tensioning Developments in Texas John E. Breen, P.E. The Nasser I. Al-Rashid Chair in Civil Engineering Ferguson Structural Engineering Laboratory The University of Texas
  2. 2. Introduction Segmental box girder bridges Post-tensioned anchorage zones Strut-and-tie modeling Precast post-tensioned substructures Cable stay and post-tensioned tendon fatigue criteria Cable stay and post-tensioned tendon corrosion protection systems
  3. 3. Introduction 40 years of continuous applications oriented research and development studies in post-tensioned concrete Broad sponsorship – TxDOT – RCRC – FHWA – NSF – NCHRP – Industry – PTI
  4. 4. Introduction Wide Recognition ASCE Croes Medal, 4 ASCE T.Y. Lin Medals, Freyssinet Medal, FIP Medal, ASBI Leadership Award, PCI Outstanding Structure Award, ACI Structural Engineering Medal Pages upon pages in AASHTO Standard Specs, AASHTO LRFD Specs, AASHTO Segmental Box Girder Guide Spec, ACI Building Code Educated dozens of highly qualified practitioners, researchers, and teachers
  5. 5. Segmental Box Girder Bridges
  6. 6. Corpus Christi JFK Causeway First precast segmental box girder bridge in USA Model Construction Model Testing
  7. 7. Corpus Christi JFK Causeway First precast segmental box girder bridge in USA
  8. 8. Corpus Christi JFK Causeway First precast segmental box girder bridge in USA Corpus Christi bridge under construction Corpus Christi bridge completed
  9. 9. Segmental Box Girder Bridges Epoxy Joint Technology Application Results
  10. 10. Segmental Box Girder Bridges External Tendon Deviators Design Cage Post-test
  11. 11. Segmental Box Girder Bridges External Tendon Bridges Span-by-span model Test results
  12. 12. Segmental Box Girder Bridges External Tendon Bridges 183 N - Austin Thermal gradient results
  13. 13. Post-Tensioned Anchorage Zones JFK Causeway Tendon path cracking Test specimen
  14. 14. Post-Tensioned Anchorage Zones Local Zone End Zone Local Zone Acceptance Criteria
  15. 15. Post-Tensioned Anchorage Zone Design Criteria FEA STM
  16. 16. Strut and Tie Modeling 3D STM Diaphragm 3D Diaphragm Test
  17. 17. Precast Post-tensioned Bridge Substructures
  18. 18. Precast Post-tensioned Bridge Substructures
  19. 19. Fatigue Criteria Post-tensioning tendon Specimen Test
  20. 20. Fatigue Criteria External tendon Test Post-test
  21. 21. Fatigue Criteria Cable stay Installation Post-test
  22. 22. Cable Stay Corrosion Protection Systems Grouting of specimen Voids forming
  23. 23. Cable Stay Corrosion Protection Systems First study that showed concrete grout was not an effective protective barrier Grout cracked when sheath cut Corrosion at grout crack
  24. 24. Post-tensioning Tendon Corrosion Protection Systems
  25. 25. Post-tensioning Tendon Corrosion Protection Systems
  26. 26. Post-tensioning Tendon Corrosion Protection Systems
  27. 27. Post-tensioning Tendon Corrosion Protection Systems Improved grouts Major contributor to ASBI & PTI improved grouting procedures Voids
  28. 28. Special Thanks Great students Dedicated technicians Cooperative faculty Patient and visionary sponsors – Especially TxDOT who never hesitated to try results in practice

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