scholarly journals Continual model and dynamic calculation of buildings under seismic impacts

2020 ◽  
Vol 329 ◽  
pp. 04011
Author(s):  
M. K. Usarov ◽  
G. T. Ayubov ◽  
D. M. Usarov
Keyword(s):  
Anisotropic Plate ◽  
Element Model ◽  
Plate Model ◽  
Dynamic Calculation ◽  
Continual Model ◽  
Theory Of Plates ◽  
Seismic Oscillations ◽  
Seismic Impacts ◽  
Moduli Of Elasticity ◽  
The Continuum

Continuum plate model in the form of a cantilever anisotropic plate developed in the framework of the bimoment theory of plates describing seismic oscillations of buildings is proposed in this paper as a dynamic model of a building. Formulas for the reduced moduli of elasticity, shear and density of the plate model of a building are given. Longitudinal oscillations of a building are studied using the continuum plate and box-like models of the building with Finite Element Model. Numerical results are obtained in the form of graphs, followed by their analysis.

scholarly journals Study of longitudinal oscillations of a five-storey building on the basis of plate continuum model

2019 ◽  
Vol 97 ◽  
pp. 04065 ◽  
Author(s):  
Javlon Yarashov ◽  
Makhamatali Usarov ◽  
Gayratjon Ayubov
Keyword(s):  
Finite Element ◽  
Continuum Model ◽  
Anisotropic Plate ◽  
Element Model ◽  
Plate Model ◽  
Theory Of Plates ◽  
Seismic Oscillations ◽  
Moduli Of Elasticity ◽  
Storey Building ◽  
The Continuum

Continuum plate model in the form of a cantilever anisotropic plate developed in the framework of the bimoment theory of plates describing seismic oscillations of buildings is proposed in this paper as a dynamic model of a building. Formulas for the reduced moduli of elasticity, shear and density of the plate model of a building are given. Longitudinal oscillations of a building are studied using the continuum plate and box-like models of the building with Finite Element Model. Numerical results are obtained in the form of graphs, followed by their analysis.

scholarly journals Actuator Effect of a Piezoelectric Anisotropic Plate Model

2006 ◽  
Vol 13 (5) ◽  
pp. 403-417 ◽  
Author(s):  
Lino Costa ◽  
Pedro Oliveira ◽  
Isabel N. Figueiredo ◽  
Rogério Leal
Keyword(s):  
Anisotropic Plate ◽  
Plate Model

scholarly journals Dynamic methods of spatial calculation of structures based on a plate model

2019 ◽  
Vol 97 ◽  
pp. 04072 ◽  
Author(s):  
Elyor Toshmatov ◽  
Makhamtali Usarov ◽  
Gayratjon Ayubov ◽  
Davronbek Usarov
Keyword(s):  
Finite Difference ◽  
Finite Difference Method ◽  
Difference Method ◽  
Strain State ◽  
Plate Model ◽  
Dynamic Calculation ◽  
Transverse Vibrations ◽  
Dynamic Methods ◽  
The Finite Difference Method ◽  
Spatial Stress

This article was devoted to the development of methods of the dynamic calculation based on the finite difference method of laminar structures in the framework of the bimoment theory, which takes into account the spatial stress-strain state. Were given the solutions of the problem of transverse vibrations of the plate model of structures.

scholarly journals Review of Sand Production Prediction Models

2013 ◽  
Vol 2013 ◽  
pp. 1-16 ◽  
Author(s):  
Hossein Rahmati ◽  
Mahshid Jafarpour ◽  
Saman Azadbakht ◽  
Alireza Nouri ◽  
Hans Vaziri ◽  
...  
Keyword(s):  
Oil And Gas ◽  
Prediction Models ◽  
Numerical Models ◽  
Element Model ◽  
Reservoir Rock ◽  
Sand Production ◽  
The Past ◽  
Short Period ◽  
Analytical Formulae ◽  
The Continuum

Sand production in oil and gas wells can occur if fluid flow exceeds a certain threshold governed by factors such as consistency of the reservoir rock, stress state and the type of completion used around the well. The amount of solids can be less than a few grams per cubic meter of reservoir fluid, posing only minor problems, or a substantial amount over a short period of time, resulting in erosion and in some cases filling and blocking of the wellbore. This paper provides a review of selected approaches and models that have been developed for sanding prediction. Most of these models are based on the continuum assumption, while a few have recently been developed based on discrete element model. Some models are only capable of assessing the conditions that lead to the onset of sanding, while others are capable of making volumetric predictions. Some models use analytical formulae, particularly those for estimating the onset of sanding while others use numerical models, particularly in calculating sanding rate. Although major improvements have been achieved in the past decade, sanding tools are still unable to predict the sand mass and the rate of sanding for all field problems in a reliable form.

Hydroelastic Analysis of a Hybrid-Type VLFS in Water of Variable Depth

2008 ◽  
Author(s):  
Tomoaki Utsunomiya ◽  
Eiichi Watanabe ◽  
Takatoshi Noguchi ◽  
Syuji Yamamoto ◽  
Tadasu Kusaka ◽  
...  
Keyword(s):  
Three Dimensional ◽  
Element Model ◽  
Plate Model ◽  
Flat Bottom ◽  
Hybrid Type ◽  
Quadrilateral Plate ◽  
Dimensional Finite Element ◽  
Hydroelastic Analysis ◽  
Three Dimensional Finite Element ◽  
Constant Slope

This paper presents a hydroelastic analysis of a hybrid-type VLFS in variable sea depth. The VLFS model is the prototype of a floating runway with dimension 3120m in length, 524m in width, 1.5m in draft for pontoon part and 11.5m in draft for semisubmersible part. A three dimensional Finite Element model using beams and quadrilateral plate elements are used in the hydroelastic analysis in order to obtain an accurate approximation. An equivalent plate model having the same eigenfrequencies and eigenmodes in air is also used in the analysis. The results using the 3D model and the plate model have been compared and their agreement is satisfying. In order to examine the variable sea depth at the expected site, the hydroelastic analysis is carried out for a flat bottom, a constant slope, and a variable sea depth case. The effect of variable sea depth is found to be significant.

scholarly journals Stochastic micromechanical modeling of transverse punch shear damage behavior of unidirectional composites

2018 ◽  
Vol 53 (9) ◽  
pp. 1197-1213 ◽  
Author(s):  
Bazle Z (Gama) Haque ◽  
Molla A Ali ◽  
Raja H Ganesh ◽  
Sandeep Tamrakar ◽  
Chian F Yen ◽  
...  
Keyword(s):  
Experimental Data ◽  
Finite Element ◽  
Shear Strength ◽  
Finite Element Model ◽  
Shear Failure ◽  
Element Model ◽  
Shear Loading ◽  
Unidirectional Composites ◽  
Micromechanical Damage ◽  
The Continuum

Punch shear in unidirectional composites is induced by transverse shear loading that progressively perforates the laminate within a narrow shear annulus. At lower micromechanical length scales, punch shear loading creates unique micromechanical damage mechanisms dominated by transverse fiber shear failure, fiber–matrix interphase debonding and large inelastic deformation and cracking of the matrix. A new punch shear experimental method has been developed to test unidirectional S glass/DER353 epoxy composite ribbons at sub-millimeter length scale. The experimental data consist of a statistical measurement of the continuum response (load-deformation and punch shear strength) and the characterization of micromechanical damage modes. A simplified 2D micromechanical finite element model incorporating Weibull fiber strength distribution has been developed and correlated with the experimental data. The 2D micromechanical finite element model can simulate the punch shear failure of the ribbon incorporating mixed mode fiber fracture, and fiber–matrix debonding mechanisms using zero thickness cohesive elements. Results from stochastic simulations of punch shear experiments show that an equivalent 2D micromechanical finite element model can predict the micromechanical damage mechanisms and the statistical distribution of punch shear strength of the continuum with favorable correlation with the experiments. This paper presents a combined experimental and computational approach in simulating the stochastic non-linear progressive punch shear behavior of unidirectional composites for the first time in the literature.

Nonlinear Dynamics Characteristic of Rotor-Bearing System by a Finite Element Model

2009 ◽  
Author(s):  
Chaofeng Li ◽  
Zhaohui Ren ◽  
Xiaopeng Li ◽  
Bangchun Wen
Keyword(s):  
Nonlinear Dynamic ◽  
Discrete Model ◽  
Element Model ◽  
Dynamic Responses ◽  
Runge Kutta Method ◽  
Significant Difference ◽  
Rotor Bearing ◽  
Comparison Of The Results ◽  
Bearing System ◽  
The Continuum

The nonlinear dynamic behavior of a rotor-bearing system is analyzed with its continuum model based on the analysis of the discrete model, with considering some other important influencing factors besides the nonlinear factors of the bearing, such as, the effect of inertia distribution and shear, transverse-torsion, structural geometric parameters of the system, which make the description of the system more embodiment and avoid the casualness of selection of system parameters. The dynamic responses of the continuum system and discrete system in the same unbalance condition are approached by the Runge-Kutta method and Newmark-β method. With the comparison of the results, significant difference about the dynamic characteristics is found with the addition of the considered factors. It is suggested that the substitution of discrete model by the continuum ones can get more accurate and abundant results. Furthermore, these results can provide more accurate verification and reference for the experiment and nonlinear dynamic design of the more complicated rotor system.

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