Print ISSN: 1681-6900

Online ISSN: 2412-0758

Keywords : finite element


Seepage Analysis through an Earth Dam (KHASA-CHAI Dam) as a Case Study

A. A. Abdulsattar; M.R. Faris; A.J. Zedan

Engineering and Technology Journal, 2017, Volume 35, Issue 2, Pages 172-181

In this research KHASA-CHAI Dam that consists of zoned embankment was investigated by using finite element method. The finite element computer software SEEP/W was used. Experimental works were done to the soils that enters in the construction of the dam to obtain the different parameters that SEEP/W software need in order to complete the analysis. The dam at its actual design was investigated by considering the water in the reservoir to be at maximum, minimum and half filled with water. Then the control of seepage and exit gradient through the dam were investigated by studying the effect of changes in the construction of the dam. It was concluded that the core in the dam has an important effect on decreasing the seepage quantity through the dam body. The presence of filters in the dam has small effect on increasing seepage quantity, but they have great effect on decreasing exit gradient.

Nonlinear Finite Element Analysis for Punching Shear Resistance of Steel Fibers High Strength Reinforced Concrete Slabs

Eyad K. Sayhood; Samer P. Yaakoub; Hussien Fadhil Hussien

Engineering and Technology Journal, 2014, Volume 32, Issue 6, Pages 1411-1432

This study is devoted to investigate the punching shear resistance of high strength reinforced concrete slabs with steel fibers by using the well-known (P3DNFEA), a non-linear finite element program for three-dimensional analysis of reinforced concrete structure.
Nine high strength reinforced concrete slabs with steel fibers and one without steel fibers, have been analyzed in the present study. The finite element solutions are compared with the available experimental data. In general, accepted agreement between the numerical results and the experimental results has been obtained.
Parametric studies have been carried out to investigate the effect of concrete compressive strength, steel fiber content, amount of steel rebars, slab depth and column dimensions on the behavior and ultimate strength of reinforced
concrete slabs.
The numerical analysis indicated that the increase in the concrete compressive strength (f'c) from 40 to 80 MPa has led to an increase in the strength by 69% and 84% for slabs without and with 0.5% steel fibers respectively. The numerical analysis indicated that by using 2.0% steel fibers, the ultimate capacity is increased by 81.7%, compared to a slab without fibers.
Also, the finite element solution revealed that increasing the longitudinal reinforcement ratio in the slab from 1% to 2% led to an increase in the ultimate shear strength of about 57%.

Evaluation of Flow Parameters around Tracking Solar Collectors with Different Collector Geometry and Different Operation Conditions

Khalid Hameed Hussein

Engineering and Technology Journal, 2014, Volume 32, Issue 4, Pages 886-907

In the current study, the flow parameters around the tracking solar collectors were evaluated. Different site conditions with different tracking solar collector's geometry are combined and investigated. Site conditions included different wind loading due to different angles of attack and wind velocity. Collector's geometry included dish collector, parabolic trough collector and Heliostat collector. The flow parameters are estimated numerically by using a suitable computational fluid dynamics (CFD) package (ANSYS FLUENT 14) to solve the governing equations and boundary conditions. The verification of numerical results was done by comparing the numerical results with experimental results of the case of parabolic trough solar collector. The results of wind loading on all types of collectors and flow characteristics at different operation conditions are obtained and compared.

A Study of the Behavior of Shell Footings using Finite Element Analysis

Adel A. Al-Azzawi

Engineering and Technology Journal, 2013, Volume 31, Issue 19, Pages 90-102

In this research, the conical shell foundation is investigated. The two components of the interacting system; the soil and the shell foundation, are modelled using the finite element method. In this study, 15-node isoparametric triangular axisymmetric elements with two degrees of freedom at each node are used to model the shell and soil. The soil-structure interaction between the footing and the supporting medium are modelled using interface elements. Comparison between the results obtained by the present analysis and those obtained by other investigations are made. The present analysis shows satisfactory results when compared with those obtained by other studies with largest percentage difference of 14% in the value of the ultimate load. Parametric studies have been carried out to investigate the effect of some important parameters on the behaviour of shell foundations. Three parameters are considered which are: semi-vertical angle, footing embedment and edge beam.

Consolidation Behavior of Two-Pile Group System under Different Loading Condition using the Bounding Surface Model

Qassun S. Mohammed Shafiqu; Maarib M. Ahmed

Engineering and Technology Journal, 2013, Volume 31, Issue 19, Pages 185-202

In this paper, soil-water coupling analyses with finite element method are conducted to investigate the long-term displacements of two-pile foundation installed in saturated cohesive soils under different loading condition. As constitutive model for clayey soil, elasto-plastic bounding surface model is considered, which is a sophisticated elasto-plastic model for normally and over consolidated soils. The influence of loading intensity and consolidation process are considered carefully. The analyses showed that the elasto-plastic bounding surface model may provide a realistic stress distribution within the soil mass around the piles. Also as conclusion of a series of analyses, the followings are clarified; 1) the long-term behavior of two-pile group system; 2) the mechanism of how the space between piles affects the long-term displacements.

Finite Element Analysis of the Boom of Crane Loaded Statically

Bakr Noori Khudhur

Engineering and Technology Journal, 2013, Volume 31, Issue 9, Pages 1626-1639

In this paper, the finite element analysis was carried out on boom of telescopic crane using ANSYS package software and the manual calculation as well as the analysis by the strength of materials procedure. The stress picture along the boom model was conducted under the maximum load carrying capacity. The stress developed at the interception of hydraulic rod with the first tube is higher than that developed along the rest of the boom. Moreover, the maximum deflection occurs at the boom head sheave.
In order to investigate the accuracy of the results, a comparison between the two approaches and the exact obtained by the strength of materials procedure is carried out.
Although the high capabilities of ANSYS software, the results are somewhat less accurate than that obtained by the manual calculations. Besides that, the results obtained by the finite element manual calculations are wholly similar to that of strength of materials procedure. Model taken for this paper is TADANO TR-350 XL 35-ton capacity.

Nonlinear Finite Element Analysis of RPC Beams Failing in Shear

Kaiss F. Sarsam; Ihsan A.S. Al-Shaarbaf; Maha M. S. Ridha

Engineering and Technology Journal, 2011, Volume 29, Issue 11, Pages 2175-2188

Reactive powder concrete (RPC) is a new type of ultra-high strength and high ductility concrete first developed in the 1990's in France. It is recognized as a revolutionary material that provides a combination of ductility, durability, and high strength. In this research work the nonlinear f ini t e element investigation on the behavior of RPC
beams is presented. This investigation is carried out in order to get a better understanding of their behavior throughout the entire loading history. Also, a numerical parametric study was carried out on the RPC beams to investigate the influence of fibrous concrete compressive strength ( ) cf f ¢ , tensile reinforcement ratio ( ) w r , fiber content ( Vf ) and shear span to effective depth ratio (a/d) on the shear behavior and ultimate load capacity of these beams.
The three- dimensional 20-node brick elements are used to model the concrete, while the reinforcing bars are modeled as axial members embedded within the concrete brick elements. The compressive behavior of concrete is simulated by an elastic-plastic work-hardening model followed by a perfectly plastic response, which terminated at the onset of crushing. In tension, a fixed smeared crack model has been
used.

Nonlinear Finite Element Analysis of High Strength Lightweight Concrete Beams

Farked Kais Ibrahim

Engineering and Technology Journal, 2010, Volume 28, Issue 10, Pages 1910-1923

This research work presents a nonlinear finite element investigation on the
behavior of lightweight reinforced concrete beams. This investigation is carried
out in order to get a better understanding of their behavior throughout the entire
loading history.
The three-dimensional 20-node brick elements are used to model the
concrete, while the reinforcing bars are modeled as axial members embedded
within the concrete brick elements. The compressive behavior of concrete is
simulated by an elastic-plastic work-hardening model followed by a perfectly
plastic response, which terminated at the onset of crushing. In tension, a fixed
smeared crack model has been used .The effect of some important parameters
(ƒ'c , rw ,a/d) have been investigated to study their influence on the predicted loaddeflection
curves

Nonlinear Finite Element Analysis of High Strength Fiber Reinforced Concrete Corbels

Maha Mohammed Saeed Ridha

Engineering and Technology Journal, 2008, Volume 26, Issue 1, Pages 1-15

This research work presents a nonlinear fini te element
investigation on the behavior of high strength fiber reinforced concrete
corbels. This investigation is carried out in order to get a better
understanding of their behavior throughout the entire loading history.
The three- dimensional 20-node brick elements are used to
model the concrete, while the reinforcing bars are modeled as axial
members embedded within the concrete brick elements. The
compressive behavior of concrete is simulated by an elastic-plastic
work-hardening model followed by a perfectly plastic response,
which terminate at the onset of crushing. In tension, a fixed smeared
crack model has been used.