The main purpose of this paper is to investigate the stiffness of soils under cyclic loading at small and medium strain level. The influence of some important factors on the shear modulus of soils such as: the strain level, the plasticity index and the mean effective stress are discussed in detail. Behaviour of different kind of soils is also compared based on available laboratory data includin...

b = a length L c = the cohesion intercept M L T Ip = the plasticity index P = a force M L T u = the pore fluid pressure ML T θ = an angle Angle μ1 = shear strength reduction factor related to time effects μ2 = shear strength reduction factor related to fissuring σ = the normal stress on a plane M L T τ = the shearing stress on a plane M L T φ = the angle of internal friction Angle ψ = an angle ...

The study of dislocation nucleation in close-packed metals by nanoindentation has recently attracted much interest. Here, we address the peculiarities of the incipient plasticity in body centered cubic bcc metals using low index Ta single crystals as a model system. The combination of nanoindentation with high-resolution atomic force microscopy provides us with experimental atomic-scale informa...

The effects of constrained sample dimensions on the mechanical behavior of crystalline materials have been extensively investigated. However, there is no clear understanding of these effects in nano-sized amorphous samples. Herein, nanoindentation together with finite element simulations are used to compare the properties of crystalline and glassy CoNi(Re)P electrodeposited nanowires (ϕ ≈ 100 n...

Abstract Soils containing significant levels of silt or clay generally exhibit unacceptable engineering properties (i.e. low strength, high compressibility and level volumetric changes) when exposed to variation in moisture content. Chemical stabilizers such as cement lime which are currently practiced, often high-priced unhygienic terms environmental sustainability. The prevailing study intend...

<p>This study utilized a series of experimental tests, including the Atterberg limit, standard Proctor, permeability, and direct shear tests. Three composites were investigated: 85% fly ash-10% bentonite (V1), 90% ash-5% (V2), 95% ash-0% (V3). All contained 5% coconut fiber. The plasticity index (PI) increased significantly from 19.10% to 22.15%, with change in content 0% 10%. composite m...

The pharmacological basis of perceptual learning and associated cortical reorganizations remains elusive. We induced perceptual learning by Hebbian coactivation of the skin of the tip of the right index finger in humans. Under placebo, tactile two-point discrimination was improved on the coactivated but not on the left index finger. This augmentation was blocked by an N-methyl-D-aspartate-recep...

In geotechnical engineering applications, it is very important to obtain the undrained shear strength of remolded soils accurately and reliably. This study aims a trustworthy solution determine clay mixtures using Atterberg limit test results in various states consistency. An experimental was carried out involving wide range varying plasticity geological origin. analyses, variation soil dependi...

Abstract In this paper, the parameters optimization of a tuned mass damper (TMD) is presented to enhance seismic performance six-story steel structure based on ductility damage index. Herein, frame modeled nonlinearly in OpenSees software by concentrated plasticity model. Finally, most suitable algorithm selected among several algorithms convergence rate and objective function's values. process...