FRICTION LOSSES IN RIGID POST-TENSIONING DUCTS

FRICTION LOSSES OF FLEXIBLE PRESTRESSING STEEL (STRANDS) IN GALVANIZED RIGID DUCTS WERE MEASURED DURING STRESSING OF TEN STRUCTURES WITH FROM TWO TO FIVE SPANS. THE MEASURED LOSSES IN NINE OF THE TEN STRUCTURES WERE EQUAL TO OR LESS THAN THE CALCULATED LOSSES USING FRICTION COEFFICIENTS FOR CURVATURE "U" OF 0.25 AND FOR WOBBLE "K" OF 0.0002; THUS CONFIRMING THE VALIDITY OF THESE CRITERIA FOR FLEXIBLE TENDONS IN GALVANIZED RIGID DUCTS. NON-SIMULTANEOUS STRESSING OF THE TENDON ENDS DID NOT AFFECT THEIR TOTAL ELONGATION. /FHWA/

• Corporate Authors:

  California Division Highways

  /Structures & Applied Mechanics
  ,   United States 

  Federal Highway Administration

  1200 New Jersey Avenue, SE
  Washington, DC  United States  20590
• Authors:
  • Bezouska, T J
  • STEWART, C F
• Publication Date: 0

Subject/Index Terms

• TRT Terms: Curvature; Ducts; Friction; Galvanizing; Length; Losses; Posttensioning; Prestressing; Steel
• Uncontrolled Terms: Elongation
• Old TRIS Terms: Wobble
• Subject Areas: Bridges and other structures; Highways;

Filing Info

• Accession Number: 00208003
• Record Type: Publication
• Source Agency: Federal Highway Administration
• Files: TRIS, USDOT, STATEDOT
• Created Date: Aug 15 1971 12:00AM