Hardin Type Resonant Column Apparatus (H-RCA)

Hardin Type Resonant Column Apparatus (H-RCA)

The Hardin Type Resonant Column Apparatus (H-RCA) from GDS Instruments is a precision testing system designed for dynamic characterization of soils under both resonant and post-resonant conditions. With its integrated electro-magnetic Hardin oscillator, this apparatus offers torsional and axial vibration testing to determine shear modulus, damping ratio, and stiffness of soil specimens. Capable of applying anisotropic axial loads up to 2 kN during resonance and 5 kN in post-resonance phases, the H-RCA supports comprehensive geotechnical investigations aligned with industry research and standards.

Key Features of Hardin Type Resonant Column Apparatus (H-RCA)

• Hardin Type Oscillator: Enables anisotropic torsional resonance testing with exceptional precision.

• Post-Resonance Axial Load Capacity: Up to 5 kN with built-in top actuator, allowing extended static or shear testing beyond resonance.

• Hybrid Cell Design: Facilitates simple sample setup by lifting the wall while retaining top cap alignment.

• Integrated Reaction Mass: Minimizes signal loss by keeping force generation and feedback mechanisms closely coupled.

• Current-Driven Power Amplifier: Ensures linear torque response across the full frequency spectrum for accurate dynamic loading.

• GDSLAB Software Automation: Simplifies test execution, enhances repeatability, and delivers high-quality data output.

Applications of Hardin Type Resonant Column Apparatus (H-RCA)

• Determination of shear modulus (Gmax) and damping ratio of soils

• Site-specific dynamic soil characterization

• Torsional shear testing for geotechnical research

• Foundation design, seismic analysis, and soil-structure interaction modeling