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resonant column and torsional system
Resonant Column Test Report
Resonant Column Test Report
Resonant Column Torsional Shear Software
resonant column and torsional system
Resonant Column Test Report
Resonant Column Test Report
Resonant Column Torsional Shear Software
Cyclic/Dynamic Testing

Resonant Column Torsional Shear Test System

Geocomp’s award-winning Resonant Column and Torsional Shear (RC-TS) testing system was developed in collaboration with Professor Vincent P. Drnevich of Purdue University and Professor John Hall of Worcester Polytechnic Institute.

The LoadTrac II/FlowTrac RC-TS system is a fully automated system designed to measure the shear modulus and damping of soils at strains down to 10-7. The unit completely automates saturation, consolidation, resonant column, torsional shear, and stress-path test phases. The system consists of a computer-controlled unit that utilizes an oscillator motor to apply cyclic torsional loading to the top of the specimen for a range of excitation levels.

Unlike other systems, a direct torque measurement is made at the bottom of the specimen to completely eliminate issues of back emf. Resonant column and torsional shear testing can also be followed by a stress-path triaxial test. The system is capable of displaying the current status of a test and graphically portraying the progress of the test in real time.

 

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Description

The resonant column test method is used to determine shear modulus and damping as a function of shear strain amplitude for a cylindrical soil specimen by means of vibration. The specimen is enclosed in a chamber and both axial load and a confining pressure are applied while within the vibration apparatus (resonant column device). Other conditions may be applied such as pore-water pressure, degree of saturation or temperature.

The torsional shear method is used to determine shear modulus, damping ratio and cyclic strength at small strains. The techniques used to simulate field conditions, and results as measured by these methods, are dependent on many factors – state of effective stress, void ratio, etc. The results are useful for examining soil-structure interaction and seismic response of deposits.
Lab Photo

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