Stone Pavement Analysis using Building Information Modeling

The growing need to recover and digitally represent heritage infrastructure has led to the challenge of choosing different Building Information Modeling (BIM) platforms that will be used to manage the implementation of the semi-automatic design and reconstruction processes of reverse engineering modeling. The approach to the integrated management of information derived through Heritage-BIM (H-BIM) has been applied to Via del Duomo, one of the main roads in the old town of Naples, Italy. During preliminary inspections of the construction site it was possible to acquire geometric features and pavement/subgrade information, as well as to conduct a photographic survey, with 1,618 photographs collected. Subsequently, the acquired data were processed, using different BIM-based tools, to obtain the 3D mesh; objects were then converted from pure graphic solids into parametric entities by proposing a specific algorithm. Then a library, with the inclusion of all the possible stone paving package alternatives, including all the structural and stress-deforming characteristics such as Young Modulus (E), Poisson coefficient (n), and Safety factor (SF), was created. In this way, it is possible to associate to the generic element the optimal pavement package solution, depending on different construction contexts. As preliminary result, a dynamic model that updates its information package and modifies the output of the analysis every time the data worksheet is integrated with new collected results is proposed for further pavement management operations evaluation.

BCC lattice cell structural characterization

In this work, a numerical characterization of BCC lattice cells is performed through the use of an homogenization approach. The main goal is to establish a relationship among those properties and the relative density of the cubic unit cell. The BCC cell struts diameter are the inputs parameters of the homogenization analysis campaing in order to vary the relative density of the unit cell. A linear periodic condition has been applied to the model in order to simulate a clear probing situation. Traction load tests are used in order to evaluate the Young modulus and the Poisson coefficient, differently a pure shear load case is employed for the evaluation of the shear modulus. Hence the final results will be presented in a graphic visualization.

Mechanical and Material Properties of Mortar Reinforced with Glass Fiber: An Experimental Study

The progressive increase in the amount of glass waste produced each year in the world made it necessary to start the search for new recycling methods. This work summarizes the experimental results of the study on mortar samples containing dispersed reinforcement in the form of glass fibers, fully made from melted glass waste (bottles). Mortar mixes were prepared according to a new, laboratory-calculated recipe containing glass fibers, granite as aggregate, polycarboxylate-based deflocculant and Portland cement (52.5 MPa). This experimental work involved three different contents (600, 1200, and 1800 g/m3) of recycled glass fibers. After 28 days, the mechanical properties such as compressive, flexural, and split tensile strength were characterized. Furthermore, the modulus of elasticity and Poisson coefficient were determined. The initial and final setting times, porosity, and pH of the blends were measured. Images of optical microscopy (OM) were taken. The addition of glass fibers improves the properties of mortar. The highest values of mechanical properties were obtained for concrete with the addition of 1800 g/m3 of glass fibers (31.5% increase in compressive strength, 29.9% increase in flexural strength, and 97.6% increase in split tensile strength compared to base sample).

Study interrelation between deformational characteristics of rocks with longitudinal and cross-sectional wave speed based on experimental data (in the order of discussion)

The paper is dedicated to the study of the interrelation between deformational characteristics of rocks (dynamic frame module, module of incompressibility, Poisson coefficient, compression ratio) with cross-sectional and longitudinal wave rates based on the systematic analysis of experimental data and carried out analysis enabled to obtain corresponding theoretical-practical outcomes. As a result of conducted analysis, it was defined that in studied exploration areas there are rocks with such lithology that to some extent may have reservoir properties marked in initial geophysical surveys as absorbing zone. Obtained analysis results are recommended to be used for efficiency increasing of carried out studies.

Transverse deformation and nonlinearity of force interactional interaction of solids

At this stage, it is necessary to allow the dependence of the Poisson coefficient (parameter of elasticity theory) on the nonlinearity of the interatomic interaction force and the anharmonicity of lattice vibrations (Gruneisen parameter). This dependence follows from the experimental data and finds justification in the framework of the existing theoretical developments, primarily the BRB model (Berlin-Rothenburg-Baserst). The relationship between the linear (harmonic) and nonlinear (anharmonic) properties of solids is discussed using the example of the unambiguous connection of the Poisson coefficient μ with the Gruneisen parameter.

TECHNOGENIC LAYER IN THE AREA OF UNDERGROUND NUCLEAR EXPLOSIONS CONDUCTING BY THE EXAMPLE OF SEMIPALATINSK TEST SITE

Results of seismic investigation of the underground nuclear explosions area at the Semipalatinsk test site are considered. Using refracted waves method subsurface zones of surrounding geological media disintegration were revealed. These zones are characterized by decrease of P and S waves velocity on the value of 0,5-1,5 km/s and increase of Poisson coefficient on 0,07. Estimation of the induced fracturing was done; parameter of crack density measures up to 0,45.

The Analysis of Large Deformation of Beam by Functionally Graded Material (FGM) Under Uniform Transverse Loading

In this paper, we study the analysis of the large beam deformation (FGM) under the uniform transverse loading. The mechanical properties of the beam including the modulus of elasticity and the Poisson coefficient are a function of the thickness of the beam (The Power Distribution Law). Principle equations for the FG-beams are obtained using the Von-Carmen theory for large deformities. The results are obtained by minimizing the total potential energy and solving it. The numerical examples are presented for this method. In this paper, the effect of material properties on the stress basin is examined from a thickness perspective. It discusses the effects of nonlinear terms in strain-relational relations.

Модуль Юнга и коэффициент Пуассона двумерно протяженного колонного графена

The Young modulus and the Poisson coefficient of two-dimensionally extended columnar graphene are theoretically studied in the uniaxial tension. The effect of length and diameter of nanotubes constituting the composite is considered. The numerical experiments are implemented using the minimum structural link and the periodical boundary conditions via the density functional theory method. The Young moduli of the composite are evaluated upon its extension along the normal to the graphene and along the graphene directions with increasing lengths of carbon nanotubes (CNTs) in the composite. The Poisson coefficient for this type of composites is found to be 0.025.