Abstract
The resonant column test includes torsional and flexural modes that can be used to obtain reduction curves for the shear modulus and Young’s modulus of the soil, respectively. When the resonant column test is performed under flexural mode, Young’s modulus is calculated mainly using the measured resonant frequency following the formula proposed by Cascante et al. However, this formula does not consider the rotational inertia effect of the electromagnetic drive disk of the resonant column apparatus and thus may inaccurately calculate Young’s modulus. In this study, the formula was modified by considering the rotational inertia effect of the electromagnetic drive disk, and its accuracy was verified by using three aluminum calibration rods with different diameters as a dummy specimen for the resonant tests in flexural and torsional modes.
Highlights
IntroductionSoil dynamic properties (including shear modulus G and Young’s modulus E) and damping ratio are indispensable parameters in the dynamic analysis of ground responses or foundation structures subjected to earthquake motions
Soil dynamic properties and damping ratio are indispensable parameters in the dynamic analysis of ground responses or foundation structures subjected to earthquake motions
High-frequency torsional or flexural vibrations are applied to the specimen by electromagnetic drive discs (EDDs), and the torsional/flexural resonant frequencies are detected at the corresponding strain
Summary
Soil dynamic properties (including shear modulus G and Young’s modulus E) and damping ratio are indispensable parameters in the dynamic analysis of ground responses or foundation structures subjected to earthquake motions. In situ tests, such as the spectral analysis of surface waves, down-hole method, or cross-hole method, are typically used to measure the shear and compression wave velocities of the soil layer, which are converted to the dynamic properties of soil (e.g., G and E) under small strain. The resonant column test, including torsional and flexural modes (Figure 1), is commonly used to measure the resonant frequencies of specimens to obtain soil dynamic properties. On the basis of the measured resonant frequency, the G or E of the soil is determined using the calculation formula
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