VARIATION OF PRESTRESS FORCE IN A PRESTRESSED CONCRETE BRIDGE DURING THE FIRST 30 MONTHS

Prestress variations were measured in a prestressed concrete box girder bridge near Reno, where the ambient relative humidity is highly variable. The data showed that the actual total creep and shrinkage losses are 30% higher than those calculated using a time step analysis and 60% higher than those estimated by the AASHTO Specifications. The results also indicated that the prestress forces continue to change due to seasonal variation in temperature and humidity. The large prestress losses appear to be due to seasonal variation of the relative humidity in the area. It is suggested that the timestep method be used to estimate prestress losses in areas of highly variable relative humidity.

Language

  • English

Media Info

  • Features: Figures; References; Tables;
  • Pagination: p. 66-72
  • Serial:

Subject/Index Terms

Filing Info

  • Accession Number: 00728672
  • Record Type: Publication
  • Files: TRIS
  • Created Date: Nov 12 1996 12:00AM