Post-Tensioning Developments in Texas
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The document discusses advancements in post-tensioning technology in Texas, highlighting the development of segmental box girder bridges and associated research. It details the use of external tendon systems, anchorage zone design criteria, and corrosion protection for tendons, while acknowledging significant contributions from various institutions and sponsors. The author, John E. Breen, emphasizes the extensive research and development that has led to practical applications and recognition in the field.
Post-Tensioning Developments in Texas
- 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. 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. 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. 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
- 6. Corpus Christi JFK Causeway First precast segmental box girder bridge in USA Model Construction Model Testing
- 7. Corpus Christi JFK Causeway First precast segmental box girder bridge in USA
- 8. Corpus Christi JFK Causeway First precast segmental box girder bridge in USA Corpus Christi bridge under construction Corpus Christi bridge completed
- 9. Segmental Box Girder Bridges Epoxy Joint Technology Application Results
- 10. Segmental Box Girder Bridges External Tendon Deviators Design Cage Post-test
- 11. Segmental Box Girder Bridges External Tendon Bridges Span-by-span model Test results
- 12. Segmental Box Girder Bridges External Tendon Bridges 183 N - Austin Thermal gradient results
- 13. Post-Tensioned Anchorage Zones JFK Causeway Tendon path cracking Test specimen
- 14. Post-Tensioned Anchorage Zones Local Zone End Zone Local Zone Acceptance Criteria
- 15. Post-Tensioned Anchorage Zone Design Criteria FEA STM
- 16. Strut and Tie Modeling 3D STM Diaphragm 3D Diaphragm Test
- 20. Fatigue Criteria External tendon Test Post-test
- 21. Fatigue Criteria Cable stay Installation Post-test
- 22. Cable Stay Corrosion Protection Systems Grouting of specimen Voids forming
- 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. Post-tensioning Tendon Corrosion Protection Systems
- 25. Post-tensioning Tendon Corrosion Protection Systems
- 26. Post-tensioning Tendon Corrosion Protection Systems
- 27. Post-tensioning Tendon Corrosion Protection Systems Improved grouts Major contributor to ASBI & PTI improved grouting procedures Voids
- 28. Special Thanks Great students Dedicated technicians Cooperative faculty Patient and visionary sponsors – Especially TxDOT who never hesitated to try results in practice