Comparison between exact and approximated visco-elastic transfer functions for a resonant-column system

Abstract

The resonant column test is the standard method in the laboratory to obtain the dynamic properties of the soil. The state of dynamic equilibrium during the test can be represented by a viscoelastic model that is expressed by a transcendent equation in complex variable. This implies that the solution of the equation to find the shear modulus and damping ratio should use fairly sophisticated numerical techniques. This article presents and compares an approximate viscoelastic equation allows to obtain a close value of the dynamic properties of soil. Finally, a set of resonant-column test was performed in order to verify the proper performance of the proposed solution