Strain gauges offer the ability to measure the effect of loads, settlement or other changes in a structure. They record strain, which is a dimensionless measure of deformation. Stress is related to strain by a material’s properties and is predictable within a certain range of applied strain.
Strain gauges are useful for determining the effects of applied loads to a structure, such as the loading of post tension cables or removal of temporary supports. Piles of driven, cast or pre cast construction can also benefit from strain measurement as with sufficient strain gauges information such as the depth at which the load is transferred to the soil and the percentage of the load born as end bearing can be determined.
Geosense® VWS-4000 series vibrating wire Rebar Strain Meters (often known as ‘sister bars’) are designed to be embedded in concrete to measure strains due to imposed loads in mass concrete.
They comprise two lengths of ribbed rebar welded to a central gauge section. The central gauge section has a miniature stainless steel VW strain gauge, fitted along the longitudinal axis of the gauge. They are normally installed in pairs within the structure on either side of the neutral axis to separate bending moments from axial loads.
Reliable long-term performance
Rugged, suitable for demanding environments
Insensitive to long cable lengths
Direct concrete embedment
Measurement of stress and strain deformation in:
Mass concrete structures
Diaphragm walls and barrettes
Accessories and Customisation
To order VWS-4000 series strain gauges the following information should be specified:
The accessories below will speed installation and data collection:
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