Print ISSN: 1681-6900

Online ISSN: 2412-0758

Keywords : finite element method

Three-Dimensional Dynamic Analysis of Pile Foundations by Using Finite Element Method

Saad Faik Abbas Al-Wakel; Mahmoud R. Al-Qaissy; Ahmed Sameer Abdulrasool

Engineering and Technology Journal, 2015, Volume 33, Issue 5, Pages 1038-1048

In recent years, there is a dramatic progress in the development of theories for dynamic analysis of piles. The finite element method is a numerical approximation procedure to analyze physical problems by transforming them into mathematical models. This needs to be done numerically because it is either too complicated or impossible to solve problems by classical analytical methods.
In this study, a three- dimensional analysisby using finite element method will be adopted to predict the displacement response of pile foundation due to dynamic loads. A case study is carried out to investigate the effect of particles size of soil, length of pile, spacing between piles andpile cap size on the dynamic response of pile foundations.
The results indicate that, the maximum amplitude of displacement of pile foundation under dynamic loads can be occurred in loose sand in comparison with the other types of sand. In addition, the increase in pile length will lead to decrease in the amplitude of displacement due to increases in the mass of the foundation.

Studying a Buckling Behavior for Edge Cracked Plates Under Compression

Nathera Abdual Hassan Saleh; Saddam Kallsan Kuess

Engineering and Technology Journal, 2012, Volume 30, Issue 1, Pages 24-42

In this work, the buckling behavior for edge cracked plates under
compression loading is studied considering the influence of the crack parameters
(i.e. size, location and orientation), plate aspect ratio and plate boundary
conditions. The problem was solved numerically using finite element method
utilizing ANSYS software version11 .The obtained results show that the crack
parameters as well as plate aspect ratio and plate boundary conditions are
efficient factors on the buckling coefficient and corresponding nodal patterns of
such plates. The useful numerical results for buckling coefficients and
corresponding nodal patterns are displayed in figures. According to the author's
knowledge about the published literature on the buckling field, there is no
specific report on the nodal patterns results of such edge cracked plates.

Optimum Design of Composite Laminated Plate Using Genetic Algorithm and RSM

Ammar Ali Hussein Al-filfily

Engineering and Technology Journal, 2011, Volume 29, Issue 5, Pages 1002-1020

The paper is focused on the application of the response surface method (RSM)
in structural optimization. Applications of the response surface method in the
design of composite laminated plate have been discussed. The response surface
method consists of two stages. In the first stage, the random variables is selected in
order to perform a deterministic computer simulation (finite element solution) in
the sample points. In the second stage, the approximation of the function (which
represent the buckling load) is performed in order to obtain response surfaces
using PDS module included in the ANSYS Program. This response surface is
incorporated into a genetic algorithm (GAs) for optimization of random input
variables to obtain maximum buckling load for composite laminated plate
subjected to both mechanical and thermal loading. GAs are stochastic optimization
algorithms based on natural selection and genetics. In contrast to traditional
gradient-based methods, GAs work on populations of solutions which evolve
typically over hundreds of generations. Four and five different variable
formulations are examined. It was found that for SSSS boundary condition and two
layer laminate the optimum values of buckling load for all thermal loading occur at
q1=33o, q2=59o, t1=1.23 mm and t2= 1.25 mm, also it can observe that the
significant random variable are t1 and t3 (in the case of five independent variables)
since the value of buckling load effected with t1 and t3 more than for t2.

Electromagnetic Interference Caused by Iraqi 400kV Transmission Lines on Buried Oil Pipelines

Suad I. Shahl

Engineering and Technology Journal, 2010, Volume 28, Issue 24, Pages 6937-6953

The electromagnetic interference caused by power transmission lines to oil and gas buried pipelines is under investigation for many years. Especially during fault conditions, large currents and voltages are induced on the pipelines that may pose danger to working personnel or may accelerate the corrosion of the pipelin’es metal. In this research, the Joule effect of eddy currents induced in the oil buried
pipelines due to the magnetic fields produced by nearby 400kV transmission lines in the South of Iraq have been computed. A computational model based on 2D finite element approach to calculate the heat generation rate. The influence of different earth resistivities for homogeneous earth model during steady state and
fault conditions is analyzed. A mitigation system using mitigation wires has been simulated to reduce induced eddy current heating effects to the safety limit.

Behavior of High-Rise Steel Building With The Inclusion of Warping

a H. Shareef; Najla; Haitham H.Muteb; Hisham M. AL-Hassani

Engineering and Technology Journal, 2010, Volume 28, Issue 22, Pages 6580-6601

The mathematical procedure in this study covers the calculation of sectorial
properties of the equivalent cross-sectional storey for high-rise building frames. The
formulation is efficiently used to obtain the free vibration analysis of high-rise
buildings which are constructed from several columns, beams, shear walls and
bracing etc. the analysis is based on transformation the complex system to a simple
tall column to represent a cantilevered tall building structure. This is partitioned to
nodes one of which indicates a storey with equivalent cross-sectional properties for
all storeys' elements after calculation of these properties with respect to the shear
center of high-rise building. A thin walled bar finite element with seven degrees of
freedom at each node is assumed. A new formulation of the stiffness and consistent
mass matrices of the thin- walled element is presented in this study. The effect of
cross sectional warping and its properties on the flexural, torsional and axial
properties was investigated, using discrete element approach in idealizing the
structure in high rise building. For the purpose of the present study, it is assumed
that the cross-sectional types under condition are only of thin-walled sections.
Algorithm method was developed which covers the calculation of sectorial
properties of the cross section for floor plan in high-rise building, to study the share
of columns for lateral shear force resistance, and investigate the behavior of different
types of high-rise building with inclusion of warping restraint. The effect of natural
frequency with height of tall buildings, and the mode shape for different crosssectional
plans of high-rise building was studied. To check the efficiency and
accuracy, the mathematical procedure is demonstrated for static and dynamic
examples by comparing the results with those obtained by using software ANSYS
program. A difference of 15% is shown. An eigen value problem is analyzed and
numerical examples are discussed.

Determination of the Stresses Concentration Factor and Cracks Growth in the Buildings by Finite Element Method

Alyaa Hassan Abood; Hani Aziz Ameen

Engineering and Technology Journal, 2010, Volume 28, Issue 21, Pages 6347-6365

The novel analysis of two buildings A and B, by finite element method via ANSYS software and experimentally are presented. The investigation is carried out to show the stresses distribution and the deflections and the cracks propagation in the walls and concrete slabs and beams for the two buildings. In both buildings the investigation included load-deflection curves, stresses and cracks patterns. The stress concentration factor is calculated for two buildings. Results are shown that the factor of concentrated for building A is between (8.4-11.4) for walls contain four windows and (6.1-7.4) for walls contain two doors, while in building B the factor of concentrated is between (13.4-14.1) for walls contain one door, and (13.9-14.6) for walls contain three windows. Also the results indicated that the cracks growth in the sites of high concentrated stresses and the load-deflection curve are approximately linear even with different loads.

2D-Flow Analysis Through Zoned Earth Dam Using Finite Element Approach

Hayder Hassan Al.Jairry

Engineering and Technology Journal, 2010, Volume 28, Issue 21, Pages 6315-6324

This paper presents an application of finite element analysis using
CivilFEM/ANSYS(11) software to predict two dimensional steady state water seepage through an earth dam of two soil zones resting on impervious base. Seepage characteristics (quantity and length of seepage surface) produced at downstream are investigated against permeability coefficient ratio changing of the two soil zones, and based on results of the solution it was found that seepage quantity and velocity downstream are very sensitive to any change of permeability
ratio of the two soil zones forming the dam.

Effect of the Number of Horizontal Construction Joints In Reinforced Concrete Beams

Maha Ghalib Ghaddar; Layla Ali Ghaleb; Qais Abdul-Majeed

Engineering and Technology Journal, 2010, Volume 28, Issue 19, Pages 5803-5821

In this paper some results from previous experimental test are adopted
and analyzed using a nonlinear three-dimensional finite element ANSYS
computer program (v.11) to investigate the effect of the presence of
horizontal construction joints (H.C.J.) on the behavior of reinforced
concrete (RC) beams.
Three beams having one, two and three (H.C.J.) that divide the beam into equal
parts, as well as one reference beam without a joint were analyzed. The results
obtained from the finite element analysis show very good agreement with the
results obtained from the previous experimental test. The maximum differences in
ultimate loads were about (8.2-10.4)% for all types of tested beams. The presence
of one, two and three (H.C.J.) in RC beams under flexure gave a decrease in the
value of the cracking load such that Pcr was (97%), (85%) and (80%) of (Bref).
The respective ultimate load capacity Pu was (96%), (89%) and (84%) compared
to (Bref).

Evaluation of Transverse Construction Joints of Reinforced Concrete Beams

Qais Abdul-Majeed

Engineering and Technology Journal, 2010, Volume 28, Issue 14, Pages 4750-4773

Construction joints are stopping places in the process of placing concrete, and they are required because in many structures it is impractical to place concrete in one continuous operation. The amount of concrete that can be placed at one time is governed by batching and mixing capacity and by the strength of the formwork. A good construction joint should provide adequate flexural and shear continuity through the interface. In this study, available experimental tests were analyzed by using a nonlinear three-dimensional finite element ANSYS computer program (v. 9). In addition an interface model was proposed for the transverse construction joints.
Six beams with different transverse construction joints at mid-span as well as to one reference beam without joint are analyzed. The reliability of the model is demonstrated by comparison with the experiment and alternative numerical analysis which shows 5-7% difference.

Finite Element Analysis of Single Sided Linear Induction Motor

Adil H. Ahmad; Mehdi F. Bonneya

Engineering and Technology Journal, 2010, Volume 28, Issue 15, Pages 5113-5123

This paper presents analysis and operation of linear induction motor (LIM) using finite element method (FEM). The solution of magnetic field problem is performed for both two and three dimensional approaches. Magnetic vector potential, flux density, field intensity, induced rotor current, and propulsion force are computed for LIM model studied. The effect of velocity is taken into consideration. The primary winding self and mutual inductances are computed for three dimensional analysis.

Effect of Non-Symmetric Die on Extrusion Process And Product Bending

Engineering and Technology Journal, 2009, Volume 27, Issue 13, Pages 430-450

The development in production of curved sections in one forming process
using direct extrusion process is going to increase annually because of increasing demands on such sections that are used in car body construction and railways .This research aims to find a new method for design of non-symmetric dies ,that can extrude a curved product by one pass of extrusion and by controlling the material flow through the deformation zone of the die .The (F.E.M) and (U.B.M) were used in
designing the non-symmetric dies so that the lower and upper die angles are different. The simulation of metal flow during the extrusion process, stresses and strains distribution in the bullet, friction factor and the die angles on the bending or eccentricity of the product were found. The extrusion pressure and the power consumption during the process were also found using both (FEM) and (UBM) methods. The results have shown that :
The bend of the product using non-symmetric dies is always towards the small die angle. It has been also shown that the amount of bent or the eccentricity of the product can be predicted from the extrusion parameters. The amount of eccentricity increased with increases of the metal displacement in the dies.

FEM-Simulation of Single and Multi Layered Induction Heating Systems

Mohammed Moanes Ezzaldean Ali; Hanan A. R. Akkar; A. K. M. AL-Shaikhli

Engineering and Technology Journal, 2009, Volume 27, Issue 13, Pages 2245-2262

Induction heating system has a number of inherent benefits compared to
traditional heating systems. Many analytical and numerical approaches have been applied to solve the problem of induction heating; efforts are made to introduce new development in computational approaches and utilization of newly developed specialized software packages to improve the methods of analysis and design of induction heating systems. This paper includes the description of the steps used for developing a general and comprehensive program, which works under ANSYS 11.0SP1 package environment. This program can be applied to analyze a wide
range of induction heating applications according to finite element method. Analysis approach is extended to deal with induction heating systems with magnetic material workpieces by introducing the multiregion method. Results of analysis the induction heating systems, by using ANSYS package, include all the electromagnetic and thermal quantities related to the induction heating process. To approve the simulation, used in this work, the results were compared with
published practical measurements, a good agreement was achieved.

Effect of Dual Reinforcement on Wear Resistance by Aluminum Compacts Reinforce by SiC, Al2O3

Mohammed Moanes Ezzaldean Ali; Hanan A. R. Akkar; A. K. M. AL-Shaikhli; Ali K. Shayyish; Muhsin J. Jweeg; Wisam Auday Hussain; Mohammed T. Hussein; Mohammad A. Al-Neami; Farah S. Al-Jabary; Jafar M. Hassan; Ali H. Tarrad; Mohammed N. Abdullah; Ahmed T. Mahdi; Eyad K. Sayhood; Husain M. Husain; Nidaa F. Hassan; Rehab F. Hassan; Akbas E. Ali; Assim H Yousif; Kassim K Abbas; Aqeel M Jary; Shakir A. Salih; Ali T. Jasim; Ammar A. Ali; Hosham Salim; JafarM. Daif; Ali H. Al Aboodi; Ammar S. Dawood; Sarmad A. Abbas; Salah Mahdi Saleh; Roshen T. Ahmed; Aseel B. Al-Zubaidi; Mohammed Y. Hassan; Majid A. Oleiwi; Shaimaa Mahmood Mahdy; Husain M. Husain; Mohammed J. Hamood; Shaima; a Tariq Sakin

Engineering and Technology Journal, 2009, Volume 27, Issue 13, Pages 423-429

The producing composite materials of dual reinforcement in which the matrix material is aluminum reinforced with two types of ceramic particles : which are Alumina (50μm


composite materials; wear test ; Al2O3; SiC: Al

The Effect of Thermal Loadings on the Dynamic Behavior of Cylindrical – Conical Intersection shell

Ali B. Assi; Ammar A. Al-Filfily; Muhsan J. Jweeg

Engineering and Technology Journal, 2009, Volume 27, Issue 4, Pages 831-851

This paper presented a numerical methods based on FEM were used to study
the effect of temperature on the dynamic characteristic of composite cylindrical
conical shell with different cone angle and wall thickness. The study taken into
account the effect of temperature on the material properties of the selected
material and the effect of pre stressing on the natural frequency of the shell. A
general conclusions could be obtained from the static analysis ,i.e. for higher
circumferential wave number, the effect of increasing the thickness is to produce
higher natural frequencies. The natural frequency of the system may drops by
about (12 %) as a result of the degeneration of the material properties due to
temperature elevation. The higher circumferential wave number, the more
pronounced is the influence of ply orientation on the resulting natural frequency
changing the ply orientation for 0/90/0 to 75/-75/75 may increase the natural
frequency by about (100 %). Finally the transient dynamic stresses may exceeds
the design stress by a bout (50 %).