LABORATORY INVESTIGATION OF PRESTRESSED LIGHTWEIGHT CONCRETE BOX BEAMS

Description and analysis is presented of a laboratory investigation of the static, repeated-loading and sustained loading behavior of full-size prestressed concrete box beams cast with lightweight aggregates. Five through-voided box beams are used in the investigation. Beams are designed for a live load of E 72 plus full impact, and test loads are applied in increments of of this design load. It is noted that, in static loading, one beam, loaded to static ultimate,failed; in repeated loading, two beams sustained, one beam failed; in sustained loading, the greatest rate of change in concrete strain took place during the first 84 days from detensioning, but, after 450 days, the rate of change was small and tended to level off. Change in camber followed a pattern similar to the concrete strains. Prediction of fatigue strength is also made.

• Corporate Authors:

  American Railway Engineering Association

  59 East Van Buren Street
  Chicago, IL  United States  60605
• Publication Date: 1967-1

Media Info

• Features: Figures; Photos;
• Pagination: p. 315-335
• Serial:
  • AREA BULLETIN
  • Volume: 68 N
  • Issue Number: 604
  • Publisher: American Railway Engineering Association

Subject/Index Terms

• TRT Terms: Beams; Concrete; Loads; Prestressed concrete; Prestressing; Static loads; Stresses
• Uncontrolled Terms: Concrete beams
• Subject Areas: Construction; Railroads;

Filing Info

• Accession Number: 00052277
• Record Type: Publication
• Source Agency: Association of American Railroads
• Report/Paper Numbers: Proceeding
• Files: TRIS
• Created Date: Jul 15 1974 12:00AM