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

Szilvágyi, Zsolt; Ray, Richard P.

doi:10.3311/ppci.11191

Cited by 7 publications

(5 citation statements)

References 7 publications

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“…The model built on Midas for this study is based on the work of Szilv agyi and Ray [18]. However, their paper focused on studying the small strain stiffness of soils, and it verified the capability of the software to model the TOSS test in a more of static manner.…”

Section: Finite Element Model In Midas Gtsmentioning

confidence: 83%

Comparison between Ramberg-Osgood and Hardin-Drnevich soil models in Midas GTS NX

Ahmad

Ray

2021

Pollack

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This paper studies the two widely used material models for predicting the dynamic behavior of soils, the Ramberg-Osgood and Hadrin-Drnevich models. Resonant column and torsional simple shear test results on dry sand were used to calibrate and evaluate the model built in the finite element software Midas GTS NX. Both material models are already implemented by the software. This study estimates the ability and efficiency of both soil models coupled with the Masing criteria to predict the behavior of soil when subjected to irregular loading patterns, (e.g., earthquakes), and measure the two most important dynamic properties, the dynamic shear modulus, and the damping ratio.

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Section: Finite Element Model In Midas Gtsmentioning

confidence: 83%

Comparison between Ramberg-Osgood and Hardin-Drnevich soil models in Midas GTS NX

Ahmad

Ray

2021

Pollack

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“…The form used today is different from the original paper. The model that is used for soil in geotechnical earthquake engineering was presented by Streeter, Wylie and Richart (1974) [28] and has since gained considerable prominence, and it has been extensively applied in numerous subsequent research endeavors (e.g., [16,29,30]). The formula for the shear stress-strain relation is…”

Section: Ramberg-osgood Modelmentioning

confidence: 99%

Modeling the Stiffening Behavior of Sand Subjected to Dynamic Loading

Ahmad,

Ray

2024

Geosciences

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In geotechnical engineering, dynamic soil models are used to predict soil behavior under different loading conditions. This is crucial for many dynamic geotechnical problems related to earthquakes, train loading and machine foundation design. Researchers agree that under dry or drained conditions, cohesionless soils increase in stiffness with each loading cycle. Soil models that simulate the dynamic behaviors of soils are often coupled with the Masing criteria. Such models neglect the impact of stiffening during cyclic loading, leading to an underestimation in the shear modulus (G). This study investigates the stiffening behavior by conducting laboratory tests on three types of Danube sands using the Resonant Column-Torsional Simple Shear device (RC-TOSS). The increase in the dynamic shear modulus with an increasing number of cycles is substantial, especially for samples with low density. Sometimes, the dynamic shear modulus doubles when loaded at high stress levels for more than 50 cycles. A new model is introduced to simulate the stiffening behavior of dry sand when subjected to cyclic torsional loading. Modifications are proposed for the Ramberg–Osgood and Hardin–Drnevich models and for the Masing criteria to overcome the limitations that accompany these models due to the influence of stiffening caused by repetitive loading being ignored. This model can be implemented in finite element and finite difference software to solve dynamic geotechnical problems.

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“…The dynamic time-history analysis is carried out based on the Newmark- β integration scheme for the traditional MCS method. In addition, the bilinear model on the Midas software platform 34 is adopted to check the Bouc-wen model used in this study, and the two models are equivalent to each other according the principle of the equal bending moment. The batch function of the Midas software platform is used for the MCS.…”

Section: Numerical Examplesmentioning

confidence: 99%

An explicit time-domain method for non-stationary random analysis of nonlinear frame structures with plastic hinges

Huang

et al. 2022

Sci Rep

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In this study, a novel approach for random vibration analysis of nonlinear frame structures under seismic random excitations is developed. The explicit time-domain method is improved in this approach by integrating the plastic hinge model, which can simulate the nonlinear behaviors caused by material property changes. Specifically, the hysteretic system’s equation of motion is constructed using auxiliary differential equations that govern the plastic rotational displacements and their corresponding hysteretic displacements. Additionally, by introducing the concept of equivalent excitations, an explicit iteration scheme for solving the equation of the hysteretic system is developed, in which the auxiliary differential equations are solved under the assumption that the plastic rotational velocity changes linearly with time between two adjacent time instants. Finally, by combining the Monte Carlo simulation method and the proposed explicit time-domain method, the non-stationary random responses of nonlinear frame structures can be obtained. As illustrated by numerical examples, the proposed method achieves satisfactory solution accuracy and efficiency when applied to nonlinear frame structures with plastic hinges. Moreover, the proposed iterative method resolves equations involving displacements describing the frame’s global state, plastic rotational displacements, and corresponding hysteretic parameters, introducing a novel concept for solving problems with nonlinear coupled variables of multiple types.

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

Cited by 7 publications

References 7 publications

Comparison between Ramberg-Osgood and Hardin-Drnevich soil models in Midas GTS NX

Comparison between Ramberg-Osgood and Hardin-Drnevich soil models in Midas GTS NX

Modeling the Stiffening Behavior of Sand Subjected to Dynamic Loading

An explicit time-domain method for non-stationary random analysis of nonlinear frame structures with plastic hinges

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