INSTRUMENTATION FOR LONG TERM FIELD STRUCTURE AND MODEL STRUCTURE INVESTIGATIONS. INVESTIGATION OF THE CONTRACTION OF PRESTRESSED CONCRETE BRIDGES

The general nature of the deterioration of prestressed concrete bridges through contraction in Nebraska is discussed and clearly illustrated through the use of photographs taken from a previous field study involving approximately 100 bridges. The test program to determine the actual nature and cause of the deterioration process involves continued study of the 100 existing bridges, two new instrumented field structures in a natural environment, and a new full-scale model structure in a partially controlled environment. The new structures were heavily instrumented with mechanical and electrical types of strain measurement devices, thermometer and humidity wells, and other deformation references. Essentially all of the devices were pre-embedded using tape-in-place techniques to avoid damage to the steel forms for the girders. This technique also gave quick access to ready-to-read installation points after girder forms were stripped. Detailed steps for the manufacture and installation of such devices are outlined.

• Supplemental Notes:
  • Prepared in cooperation with Federal Highway Administration, and Nebraska Univ., Lincoln. Hydrodynamics Lab.
• Corporate Authors:

  Nebraska Department of Roads

  1500 Highway 2, P.O. Box 94759
  Lincoln, NE  United States  68509

  Denver University

  College of Law
  Denver, CO  United States  80210

  University of Nebraska, Lincoln

  Hydrodynamics Laboratory
  Lincoln, NE  United States  68508
• Authors:
  • Holmes, J R
  • Schmid, G W
  • Downey, G L
  • Ekstrom, R E
• Publication Date: 1974-7

Media Info

• Pagination: 100 p.

Subject/Index Terms

• TRT Terms: Contraction; Creep; Deformation; Deterioration; Girder bridges; Highway bridges; Humidity; Mathematical models; Measuring instruments; Prestressed concrete; Shrinkage; Strain gages; Strain measurement; Temperature measurement
• Uncontrolled Terms: Models
• Geographic Terms: Nebraska
• Subject Areas: Bridges and other structures;

Filing Info

• Accession Number: 00090033
• Record Type: Publication
• Source Agency: National Technical Information Service
• Report/Paper Numbers: Research Study-66-6 Intrm Rpt.
• Files: NTIS, STATEDOT
• Created Date: Apr 22 1975 12:00AM