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Prestressed ConcreteOnline self-study

Damage Evaluation and Repair of Prestressed Members

1 PDH · about 60 minutes · Course no. BR-P02 · Instructor: Michael Craig, PE

About the instructor

Michael Craig, PE is Senior Vice President and Southeast Director at Strinteg Corporation, leading bridge inspection and structural engineering across eight states and Puerto Rico. In 27+ years he has inspected over 4,000 structures and completed 3,000+ load ratings and 160+ load tests. He has managed repair and preservation design for complex bridges, including cable-stayed bridges. He holds PE licenses in twelve states, DC and Puerto Rico, SPRAT Level 1, and FAA Part 107 credentials.

Overheight vehicles strike prestressed concrete girders on overpasses every year, and corrosion attacks strands in girders under leaking joints and in marine air. This course covers how to inspect, assess and repair that damage. It is built on three public sources. The first is NCHRP Report 280, Guidelines for Evaluation and Repair of Prestressed Concrete Bridge Members (Shanafelt and Horn, 1985), which includes full-scale tests on an AASHTO Type III girder. The second is its predecessor, NCHRP Report 226, Damage Evaluation and Repair Methods for Prestressed Concrete Bridge Members (1980). The third is the 2012 Guide to Recommended Practice for the Repair of Impact-Damaged Prestressed Concrete Bridge Girders, from NCHRP Project 20-07 Task 307 (Harries and others, University of Pittsburgh), which adds CFRP methods and a damage classification. Code provisions are quoted as these sources state them; confirm article numbers against current editions. Worked numbers are labeled illustrative.

⬇ Download study guide (PDF)

Learning objectives

  • Classify impact and corrosion damage
  • Evaluate loss of strands
  • Select repair approaches
  • Know when replacement is needed

Outline

  1. Why damage to prestressed members is different
  2. Inspecting the damage
  3. Classifying damage
  4. Assessing strength of the damaged member
  5. Measuring the force left in exposed strands
  6. Repairing concrete damage: nicks, gouges, cracks and shattered concrete
  7. Preloading: what Report 280's tests showed
  8. Restoring strands: splices, sleeves and external post-tensioning
  9. FRP repair methods and how to choose
  10. Corrosion, replacement and a worked example
  11. Open the course (16 screens, 2 knowledge checks)
  12. Final quiz — 10 questions, 70% to pass

References

  1. NCHRP Report 280, Guidelines for Evaluation and Repair of Prestressed Concrete Bridge Members, 1985
  2. NCHRP Report 226, Damage Evaluation and Repair Methods for Prestressed Concrete Bridge Members, 1980
  3. PCI, Bridge Design Manual, 3rd Edition (with revisions)
  4. NCHRP Project 20-07, Task 307: Harries, K.A., Kasan, J., Miller, R., Brinkman, R., Guide to Recommended Practice for the Repair of Impact-Damaged Prestressed Concrete Bridge Girders, Final Report Appendix A, University of Pittsburgh / AASHTO, 2012.
  5. ACI 440.2R, Guide for the Design and Construction of Externally Bonded FRP Systems for Strengthening Concrete Structures (as cited by the 2012 Guide; 2008 edition).