The concept of prestressing was recognized for over a century. The earlier development of prestressing started with external tendons, rather than internal tendons, but failed to be recognized due to two main reasons. The first was the low tensile performance of earlier steel in combination of a poor knowledge of creep and shrinkage concrete properties. The second was the lack of corrosion protection.

The development of external tendon technology in design, construction and maintenance for post-tensioned bridges will be presented. The recent published state of the art fib Bulletin 97 on External Tendons for Bridges will be the main sources of the presentation, including author’s many years experiences dealing with external tendons for bridges and the latest FDOT research report. The author participated in the development of the report as a Co-Chair of the document as part of fib Commission 5, Task Group 5.8. The report covered the state of the art of practices in the external tendon application specifically for bridges, although external tendons can also be applied for building constructions. The report started the discussions from the historical development to primary components, durability aspects, corrosion protection, design, detailing, fabrications, installation and tendon replacement, including approval testing, quality assurance, quality control, inspection, and monitoring of external tendons. The report also provided application examples of external tendons in new bridge constructions and rehabilitations. The most important goals of the report are to improve the understanding of quality, durability and for the future advancement of external tendons technology.

Presenter: Teddy S. Theryo, P.E. (Major Bridge Design Engineer – FDOT Structures Design Office)

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This training is not being hosted by the Florida LTAP Center.  For details about this training, please contact the event organizer directly.