Modulus and Damping Due to Uniform and Variable Cyclic Loading

This study focuses on the back analysis of a geotechnical laboratory test with nonlinear finite element modeling using the IntroductionRecently the importance of numerical modeling in geotechnical engineering has increased greatly; not only in research, but in everyday practice as well. As a result, geotechnical material models have developed tremendously due to their increased use with ever more complex design projects. While advances in computer technology have made this possible; the many economic and practical advantages of faster and more accurate solutions have made it a reality. The cycle time between research, development, deployment, and design implementation has indeed been reduced from years to months.Since the deployment cycle has shortened, the process of verification and validation are even more crucial [1]. For geotechnical finite element software, verification is the process of showing that a model or method has been properly implemented in a computer program; while validation makes plausible that a computer model possesses the essential features to analyze a real world problem with results that are representative for the situation. The former is usually done by the software developer and the latter should be done by the user when creating a model. This paper focuses on the verification of the Ramberg-Osgood model in an axisymmetric case for static torsional loading. Laboratory tests have been performed on dry sand samples and results are used to verify the capabilities of the material model.

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“…Since then, several authors used the model connected to geotechnical earthquake engineering e.g. [14].…”

Section: Formulation Of the Ramberg-osgood Model In Midas Gts Nxmentioning

confidence: 99%

“…A combined Resonant Column-Torsional Simple Shear device (RC-TOSS) designed and built by the authors, was used for testing [15], [14]. It has been further developed and used in previous studies at Széchenyi István University (SZE) [16], [17] and [18].…”

Section: Torsional Shear and Resonant Column Testsmentioning

confidence: 99%

Verification of the Ramberg-Osgood Material Model in Midas GTS NX with the Modeling of Torsional Simple Shear Tests

Szilvágyi

Ray

2018

Period. Polytech. Civil Eng.

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“…The RC-TOSS device can measure rotational displacement and acceleration, longitudinal displacement, torque and pore pressure [4]. These are accomplished by proximitors, an accelerometer, a linear variable differential transformer (LVDT), by coil current, and a pressure transducer, respectively.…”

Section: Resonant Column Torsional Simple Shear (Rc-toss) Devicementioning

confidence: 99%

Soil Shear Modulus From Resonant Column, Torsional Shear and Bender Element Tests

Szilvágyi¹

2016

geomate

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This study compares results from three different testing methods: Resonant Column, Torsional Simple Shear, and Bender Element tests to determine shear modulus. The resonant column and torsional shear tests were performed on the same hollow cylinder specimen. The bender element test was performed on a triaxial specimen with the same void ratio and confining stress as well as others. Several effects were studied, among them confining stress, shear strain amplitude and for the bender element, anisotropic confinement. Testing methods and data analysis are discussed in the paper because data interpretation is very important in these tests. Results showed that the shear modulus values were almost identical between the resonant column and torsional shear but varied somewhat with the bender element results. Further research will focus on influence of stress anisotropy preparation methods.

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“…Wilson and Dietrich (1960), Hardin and Music (1965), Hardin (1970), Drnevich (1977), Drnevich et al (1978), Edil and Luh (1978), Isenhower (1980), Drnevich (1985), Ray and Woods (1988), Morris (1990), Lewis (1990), Cascante et al (1998) …”

Section: Astm D 4015mentioning

confidence: 99%

Wave Propagation Methods for Determining Stiffness of Geomaterials

Sawangsuriya¹

2012

Wave Processes in Classical and New Solids

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Modulus and Damping Due to Uniform and Variable Cyclic Loading

Cited by 48 publications

References 11 publications

Verification of the Ramberg-Osgood Material Model in Midas GTS NX with the Modeling of Torsional Simple Shear Tests

Verification of the Ramberg-Osgood Material Model in Midas GTS NX with the Modeling of Torsional Simple Shear Tests

Soil Shear Modulus From Resonant Column, Torsional Shear and Bender Element Tests

Wave Propagation Methods for Determining Stiffness of Geomaterials

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