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.
- Prepared in cooperation with Federal Highway Administration, and Nebraska Univ., Lincoln. Hydrodynamics Lab.
Nebraska Department of Roads1500 Highway 2, P.O. Box 94759
Lincoln, NE USA 68509
Denver UniversityCollege of Law
Denver, CO USA 80210
University of Nebraska, LincolnHydrodynamics Laboratory
Lincoln, NE USA 68508
- Holmes, J R
- Schmid, G W
- Downey, G L
- Ekstrom, R E
- Publication Date: 1974-7
- Pagination: 100 p.
- 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;
- 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