Determination of the Material Damping Ratio with the Bender Element Test

Karl, Lutz; Haegeman, Wim; Degrande, Geert; Dooms, David

doi:10.1061/(asce)1090-0241(2008)134:12(1743)

Cited by 19 publications

(7 citation statements)

References 18 publications

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“…SCPT tests performed in May 2003 (Karl 2005; Karl et al 2006) have allowed for the determination of the shear wave velocity up to a depth of 6 m: it increases almost linearly from 160 m s −1 at 1 m depth to 280 m s −1 at 6 m depth. The material damping ratio has also been derived from SCPT tests (Karl et al 2008), resulting in a highly uncertain value between 0.00 and 0.06.…”

Section: Application To Real Measurement Datamentioning

confidence: 99%

Determination of the material damping ratio in the soil from SASW tests using the half-power bandwidth method

Badsar¹,

Schevenels²,

Haegeman

et al. 2010

Geophysical Journal International

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This paper presents a novel technique for the determination of the material damping ratio in shallow soil layers. It is based on the spectral analysis of surface waves (SASW) test. The technique is an alternative to existing methods, where the damping ratio is determined from the spatial decay of the Rayleigh wave. These methods rely on the knowledge of the geometric damping, and may lead to incorrect results if the geometric damping is calculated based on an inaccurate shear wave velocity profile. The existing methods may also lead to incorrect results when higher modes contribute to the wavefield in the soil. In the proposed technique, the wavefield is transformed to the frequency-wavenumber domain. The resulting frequency-wavenumber spectrum exhibits a peak that corresponds to the fundamental Rayleigh wave. The dispersion curve is derived from the peak's position, whereas the attenuation curve is derived from its width, using the half-power bandwidth method. Due to the use of the appropriate wavenumber transformation, this method does not require the calculation of the geometric damping. In addition, the occurrence of higher Rayleigh modes does not affect the attenuation curve associated with the fundamental Rayleigh wave, as higher modes appear as separate peaks in the frequency-wavenumber spectrum that do not interfere with the peak corresponding to the fundamental Rayleigh wave (except at the osculation points). Three benchmark problems are considered to validate the outlined technique; the results are compared with those obtained using existing methods. All methods perform well when applied to a regular soil profile, where the stiffness of the soil increases with depth. For soil profiles with a soft layer trapped between two stiffer layers, or where the soil properties vary smoothly with depth, the proposed technique yields more accurate results than the existing methods. The practical applicability of the new method is finally illustrated using experimental data collected from a test site in Belgium

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Section: Application To Real Measurement Datamentioning

confidence: 99%

Determination of the material damping ratio in the soil from SASW tests using the half-power bandwidth method

Badsar¹,

Schevenels²,

Haegeman

et al. 2010

Geophysical Journal International

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“…As the strain range of the cyclic triaxial test was unable to go below the threshold strain, the wave propagation test was incorporated into the cyclic triaxial test so that the normalised shear stiffness and damping ratio of residual soil specimens can be determined at both saturated and unsaturated states. To date modelling efforts on dynamic laboratory tests include modelling of resonant column tests by Karl et al (2003Karl et al ( , 2008 using ABAQUS, modelling of bender element tests by Arroyo et al (2002Arroyo et al ( , 2003aArroyo et al ( and b, 2006, Rio (2006) using FLAC3D, andHardy et al (2002) using Fourier Series Aided Finite Element…”

Section: Discussionmentioning

confidence: 99%

“…Wang et al (2006) made use of bender elements placed at different distances apart in a box filled with Toyoura sand. Other researchers (Karl et al 2008 andKhan et al 2011) "lengthen the specimen" by comparing the main arrival wave with the echoes. In all the above cases, both Q and V remain the same except for the distance travelled.…”

Section: Spectral Ratio Methods (Srm)mentioning

confidence: 99%

“…Toksöz et al (1979) took into consideration of the region where spectral ratios are linear with frequency where signals-to-noise ratio is high. Other researchers like Frempong et al (2007), Wang et al (2006), Karl et al (2008) and Khan et al (2011) obtained slopes around the dominant frequency but different ranges of frequencies were used.…”

Section: Spectral Ratio Methods (Srm)mentioning

confidence: 99%

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Properties of soils using laboratory seismic methods and numerical modelling

Cheng¹

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CHAPTER 4: Finite Element Modelling 4.1 Outline and Purpose 4.2 Introduction to LS-DYNA 4.3 Calibration for stiffness response 4.3.1 The Timoshenko beam effect 4.3.2 Verification of the finite element model 102 4.3.3 Finite element simulation program 104 4.3.4 Correction factor for the Timoshenko beam effect 105 4.3.5 Validation of correction factor χ m 108 4.4 Calibration for damping response 114 4.4.1 The Viscoelastic material model 114 4.4.2 Input Parameters for Viscoelastic Model 118 4.4.3 Finite element simulation program 120 4.4.4 Calibration of viscoelastic model using simulated resonant column test 122 4.4.5 Wave Propagation in a semi-infinite medium 125 4.5 Simulations for the Verification of the Hilbert Transform Method 128

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“…Além da determinação do módulo de cisalhamento máximo, recentemente este equipamento tem sido utilizado para medida da razão de amortecimento mínimo do solo, que está associada a muito pequenas deformações (Brocanelli e Rinaldi, 1998;Takkabutr, 2006;Karl, et al, 2008). Neste caso, semelhante ao que ocorre no ensaio de coluna ressonante, busca-…”

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Deformabilidade de um solo laterítico não saturado

Georgetti¹

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Determination of the Material Damping Ratio with the Bender Element Test

Cited by 19 publications

References 18 publications

Determination of the material damping ratio in the soil from SASW tests using the half-power bandwidth method

Determination of the material damping ratio in the soil from SASW tests using the half-power bandwidth method

Properties of soils using laboratory seismic methods and numerical modelling

Deformabilidade de um solo laterítico não saturado

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