High frequency content in nonlinear soil response: A numerical artifact or a reality?

Nonlinear Soil Response A Reality ?

Geotechnical models consistently indicate that the stress-strain relationship of soils is nonlinear and hysteretic, especially at shear strains larger than 1 0 5 to 10 .4 . Nonlinear effects, such as an increase in damping and reduction in shearwave velocity as excitation strength increases, are commonly recognized in the dynamic loading of soils. On the other hand, these effects are usually ig...

A Numerical Evaluation of Seismic Response of Shallow Soil Deposits

This paper employs one-dimensional numerical ground response analysis models to investigate seismic response of shallow cohesive and non-cohesive soil deposits on vertical propagation of horizontal shear waves. Soil response is modelled by traditional equivalent-linear (EL) frequency-domain analysis using DEEPSOIL software and nonlinear (NL) time-domain analysis using OPENSEES software. The ana...

Nonlinear Soil - Pile - Structure Interaction in Dynamic or Seismic Response

The stiffness and damping of pile foundations are proposed, which vary with the ratio of shear modulus Gi / Go to indicate the nonlinear properties of soil. The range of Gi / Go is defined with different vibration intensities for applications, and a computer program DYNAN is available based on the boundary zone model with non-reflective interface. Two engineering cases are studied to illustrate...

Neuropsychological deficits in chronic fatigue syndrome: artifact or reality?

low success rate of art, an illusion, a reality or simply a too high expectation?

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