Webinar: Evaluation of Existing Post-Tensioned Concrete Structures (PTI DC-80 Repair, Rehabilitation, and Strengthening Committee)-Webinar: Evaluation of Existing Post-Tensioned Concrete Structures (PTI DC-80 Repair, Rehabilitation, and Strengthening Committee)

Webinar: Evaluation of Existing Post-Tensioned Concrete Structures (PTI DC-80 Repair, Rehabilitation, and Strengthening Committee)

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Video Transcription

Video Summary

In February's Post-Tensioning Institute webinar, moderator Kyle Boyd, chair of the Education Committee, presented a session on evaluating existing post-tension structures, which remains a highly requested topic due to frequent inquiries about renovations, inspection, and corrosion issues. The session featured Otto Schwartz, a seasoned structural engineering consultant, who shared insights based on the PTI DC80 Committee's work, specifically the DC80.3 publication, which focuses on the repair and evaluation of unbonded post-tension concrete structures.<br /><br />Schwartz's presentation was targeted at engineers with three to five years of experience in structural engineering, aiming to provide both foundational knowledge and practical field insights. The webinar covered essential post-tensioning concepts, system types, and history, explaining the evolution from buttonhead wire systems to modern encapsulated and extruded ones.<br /><br />The evaluation process outlined included document review, field investigation through visual and non-destructive evaluation techniques, and exploratory analysis to identify structural issues. Schwartz discussed the importance of understanding post-tensioning systems to diagnose possible damage accurately. He highlighted common problems such as improper tensioning, design errors, and environmental impacts like corrosion.<br /><br />The session also presented various non-destructive evaluation methods, including acoustic emissions and ground-penetrating radar, explaining their utility in diagnosing strand condition and structural integrity. Schwartz emphasized the need for qualified professionals in conducting these evaluations to ensure accurate assessments and safety.<br /><br />The webinar concluded with upcoming sessions topics, including barrier cable design and the new joint ACI PTI 320 code, inviting participants to future webinars.

Keywords

post-tensioning

structural engineering

corrosion issues

PTI DC80 Committee

unbonded post-tension

non-destructive evaluation

acoustic emissions

ground-penetrating radar

structural integrity

ACI PTI 320 code