3D-FEM-Analysis on the Seismic Behavior of Foundation Piles and Soil Structure Interaction

This research deals with the study of the behavior of piles under the influence of seismic loads through (3D) modeling using FE-Method-program (ABAQUS) with special reference to the most important parameters affecting the displacements and internal forces generated in piles. This study has been completed in two phases: the first phase is a case study of the single Pile (reference case), where a study of the behavior of a single pile assigning structure is modeled with a degree of freedom. The parametric study results show that the presence of structure causes the application of a large load in the upper part of the pile resulting from the impact of inertia dominating the kinetic effect. The forces of inertia increases with the increasing mass of structure, and when the frequency of structure nears the frequency of seismic load. The second phase deals with the study of the situation of the group of piles, where the study handles the effect of a number of piles, piles spacing, and locations on the internal force and displacements generated in the piles. The parametric study results have shown for this phase of this research that an increase the number of piles in the group causes a significant increase of internal forces generated at the top of the pile and a slight decrease for those forces in the central part of the pile, that seismic loads are not distributed equally for all piles, and that corner piles are subject to greater loads while mid. Piles are subject to less load.

Evaluation The Efficiency of a Suggested Model in Emulation The Behavior of R.C. Beams Strengthened with GFRP Strips

Our Paper is a laboratory modeling research to evaluate the efficiency of finite element model in emulation the behavior of R.C. beams with shear deficiencies (ultimate load, mechanism of cracking and failure, load-deflection behavior) strengthened with GFRP strips. We tested nine R.C. beams 200x30x16 cm in three groups, the first consists of three R.C.beams for comparing, the second consists of three strengthened R.C. beams with two sides vertical GFRP strips, and the third also consists of three strengthened R.C. beams with two sides inclined (45°) GFRP strips. We modeled these beams by advanced finite element program Ansys10, and we get results agreed with our laboratory study.

Modeling and Simulation of Electromagnetic Fields in Three-Phase Induction Motors Using ANSYS Software

The study of electromagnetism in electrical machines is critical, especially in the field of design, investment and optimal performance. To achieve this, there are many ways in which varying degrees of accuracy . The main aim of this piece of research is to study electromagnetic fields distribution in 3ph-induction machines using computational numerical methods and proper software, because these fields form the basic principle in machine 's work. It has been used the finite element method aided computer to solve magnetic equations (Maxwell equations). The simulation of magnetic field in induction machine performed by ANSYS-software. The paper shows technique for finding the electromagnetic fields distribution in all parts inside 3phinduction machine to get optimal design.

High Nonlinear Photonic Crystal Fibers (PCF) Design with Very Low Confinement Loss

A Photonic Crystal Fiber (PCF) is a special class of optical fibers which is made of a single material and having air holes in the cladding. This paper studies and compares the optical characteristics such as effective area, confinement loss and nonlinearity, among three different PCF's structures: Hexagonal PCF (HPCF), Octagonal PCF (O-PCF) and Decagonal PCF (D-PCF) with varied structural parameters (number of the air-holes rings, the air-hole's diameter, and the lattice constant), and the target is to use the fiber in a Raman amplifier. Proposed structures are simulated by using COMSOL MULTIPHYSICS which depends on Finite Element Method (FEM). The numerically simulated results shows that Decagonal PCF (D-PCF) offers lower confinement loss, lower effective area, and larger value of nonlinearity than the other two structures. It is seen that Decagonal PCF(D-PCF) is suitable for long transmission fiber applications.

Geometrical Nonlinear Analysis Based on 2th order theory of two and three dimensional Framed Structure Using a Modified Finite Element Method

In this work, a modified finite element displacement approach is used to analyze two and three dimensional Framed Structure. The element is based on second order theory.

Finite Element Modelingof the Ground Surface Deformations induced by shallow Tunnels in Soft Ground

In this paper, ground surface settlement induced by tunneling have been studied using 2D finite element analysis. By assuming greenfield conditions, which means that there is no loads on the soil surface above the tunnel. A FE study was conducted in which an elasto-plastic constitutive model was adopted to model the soil behavior (MC,HS). This paper include Comparison between actual field measurements with (FEM) results, and parametric study for the most factors that influence ground surface settlement.

Numerical Analysis on improvement of Bearing Capacity of Strip footing on reinforced Clay with Geogrid layer

This research study aims at investigating the potential benefits of using the reinforcement to improve the bearing capacity and reduce the settlement of strip footing on clay. To implement this objective, many numerical 2D-analyses by finite element method / Plaxis program were performed to study the behavior of reinforced soil foundation. And then we carry out a parametric study of the most effective parameter on bearing capacity. The results showed that the inclusion of reinforcement can significantly improve the soil’s bearing capacity and reduce the footing settlement. The strain developed along the reinforcement is directly related to the settlement. The results also showed that the inclusion of reinforcement can redistribute the applied load to a wider area, thus minimizing stress concentration and achieving a more uniform stress distribution. The redistribution of stresses below the reinforced zone can result in reducing the settlement of the underlying weak clayey soil.

Algorithm to solve nonlinear Advection Equation numerically using cubic Bspline

In this paper, we introduce an algorithm to solve the Advection equation by finite element method. In this method, we have chosen Three pattern of cubic B-Spline to approximate the nonlinear solution to convert the nonlinear PDE into a system of ODE, Then we solved this system equation by SSP-RK54 method, And we made a program implementing this algorithm and we checked the program using some examples, which have exact solutions, then we evaluate our results. As a conclusion we found that this method gives accurate results for advection equation.

The study of the electromagnetic field distribution in a 20/0.4kV distribution transformer using the finite element method

This research presents a study of distribution of the electromagnetic fields in three-phase distribution transformer 200kVA-20/0.4kV through the conclusion of the governing electromagnetic equation and solve it using finite element method by FEMM4.2 program.

Design of high selectivity tri-band microstrip BPF using tri-section stepped impedance resonator

In this research, tri-band microstrip band pass filter (BPF) has been designed at frequencies (2.37,3.32 ,5.2)GHz which are located at the domain of WiMAX and WLAN systems’ application by using tri-section stepped impedance resonators TSSIRs with open stub and zero feed line. By changing ratios of impedance of stepped impedance resonator.