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.
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Availability:
- Find a library where document is available. Order URL: http://worldcat.org/oclc/12789822
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Corporate Authors:
Precast/Prestressed Concrete Institute
209 West Jackson Boulevard
Chicago, IL United States 60606 -
Authors:
- Saiidi, M S
- Shields, J
- O'Connor, D
- Hutchens, E
- Publication Date: 1996-10
Language
- English
Media Info
- Features: Figures; References; Tables;
- Pagination: p. 66-72
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Serial:
- PCI Journal
- Volume: 41
- Issue Number: 5
- Publisher: Precast/Prestressed Concrete Institute
- ISSN: 0887-9672
- Serial URL: http://www.pci.org
Subject/Index Terms
- TRT Terms: Creep; Humidity; Measurement; Prestressed concrete bridges; Shrinkage; Strain measurement; Temperature; Thermal stresses
- Old TRIS Terms: Creep rate; Shrinkage tests
- Subject Areas: Bridges and other structures; Design; Highways; I24: Design of Bridges and Retaining Walls;
Filing Info
- Accession Number: 00728672
- Record Type: Publication
- Files: TRIS
- Created Date: Nov 12 1996 12:00AM