STRAIN METERS AND STRESS METERS FOR EMBEDMENT IN MODELS OF MASS CONCRETE STRUCTURES
A WORLDWIDE SURVEY TO DEVELOP INFORMATION ON SMALL, EMBEDDED STRESS METERS AND STRAIN METERS SUITABLE FOR MODEL WORK & LONG-TERM INVESTIGATIONS WAS UNDERTAKEN. FOLLOWING A DISCUSSION OF GENERAL PROBLEMS OF INTERNAL STRAIN AND STRESS MEASUREMENT IN CONCRETE, INCLUDING A BRIEF REVIEW OF THE ADVANTAGES AND DISADVANTAGES OF VARIOUS SYSTEMS OF MEASUREMENT, NUMEROUS PARTICULAR METERS ARE DESCRIBED IN DETAIL, AND THEIR APPLICABILITY TO MODEL WORK IS TENTATIVELY ASSESSED. THE INFORMATION COLLECTED REVEALS A LACK OF SMALL, EMBEDDED METERS SUITABLE FOR LONG-TERM MODEL STUDIES, AND INDICATES THAT IN THE PAST, PRIMARILY TWO MEASURING PRINCIPLES WERE USED FOR LONG-TERM MEASUREMENTS IN CONCRETE. THESE WERE THE UNBONDED WIRE AND THE ACOUSTIC METER. NEITHER SYSTEM, HOWEVER, LENDS ITSELF WELL TO CONSTRUCTION OF VERY SMALL METERS (LESS THAN ABOUT 2-IN. MAXIMUM DIMENSION). A NUMBER OF OTHER SYSTEMS OF MEASUREMENT (INDUCTANCE-CAPACITANCE, SEMICONDUCTOR, HYDRAULIC, AND PNEUMATIC METERS) THAT APPEAR RATHER PROMISING FOR INTERNAL STRESS AND STRAIN MEASUREMENT IN CONCRETE HAVE HARDLY BEEN INVESTIGATED TO DATE. BASED ON THE RESULTS OF THIS PRELIMINARY STUDY, IT IS CONCLUDED THAT FURTHER EFFORTS TO SELECT OR DEVELOP SUITABLE INSTRUMENTATION FOR INTERNAL LONG-TERM STRESS AND STRAIN MEASUREMENTS IN CONCRETE MODELS SHOULD CONCENTRATE ON THE EVALUATION AND IMPROVEMENT OF BONDED-WIRE METERS, ON THE DEVELOPMENT OF NEW INDUCTANCE AND SEMICONDUCTOR METERS, AND ON THE USE OF EXISTING SMALL ACOUSTIC METERS. /AUTHOR/
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Supplemental Notes:
- Tr 6-811, pP 1-A6, 28 FIG, 5 TAB, 71 REF, 1 APP
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Authors:
- Geymayer, H G
- Publication Date: 1968-1
Media Info
Subject/Index Terms
- TRT Terms: Acoustic measuring instruments; Acoustics; Capacitance; Concrete structures; Data collection; Hydraulics; Inductance; Measurement; Measuring instruments; Pneumatic equipment; Semiconductors; Strain measurement; Stresses; Surveys; Wire
- Old TRIS Terms: Acoustic measurement; Bonded wire meters; Pneumatic devices
- Subject Areas: Geotechnology; Highways; Materials;
Filing Info
- Accession Number: 00216643
- Record Type: Publication
- Files: TRIS
- Created Date: Dec 9 1994 12:00AM