In this paper, the modeling methods of tunneling and the surface subsidence induced by
that have been studied by using two-dimensional numerical analysis according to the FEM
method, assuming the green field condition، which means that there is no
load 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 (HS, HSsmall).
This article includes a comparison between the results of numerical analysis and field
measurements to executed projects، and a suggested method for modeling tunnel
excavation and surface subsidence induced by that.
The study
will examine the effect of changing the diameter of the longitudinal
and lateral reinforcement on the carrying capacity of the concrete
columns and compare the value of the compressive strength of
concrete, which is associated with the theoretical relations provided
by (Mander), (Park et all) by building an analytical model using
finite element Program ANSYS.
Tensile and bending tests modeling have been undertaken for various welded joints
which were different in shape and design. Also, the hot spot stress was calculated at critical
failure areas using the finite elements analysis method. There was a go
od similarity
between experimentally defined critical areas in certain certified literature and those in our
modeling. It appeared that the information listed in the international institute for welding
(IIW) in regards of hot spot stress method gives relatively accurate values for the welded
joints possibility to endure fatigue loading and keep their desired mechanical properties
even those joints that could fail only at the connecting area with the base metal.
This research deals with analytical study of exterior Beam-Column
connections behavior under seismic load.
Tow parameters were considered: axial load on the column and
confinement of joint region with stirrups.
Ansys program was used to analytica
l study of three types of exterior
Beam-Column connections under cyclic load.
The results were shown a good agreement with general behavior of
three types.
The analytical results indicate that the tow parameters will improve
the behavior of the connections delay cracking at joint core and
increasing connection stiffness in rotation and displacement with
decreasing shear value at joint.
The use of modern methodologies and techniques a new approach to evaluate the
process of engineering design in the industry pay to use in evaluating the speed in large
cans mechanisms design.
The gearbox that is designed for big vehicles for off-r
oad driving conditions need
portal axle which installed between the wheel and the axle shaft to give higher ground
clearance to the vehicle.
The modeling and simulation of spur gear which contacted with portal axle is
important to predict the actual motion behavior, but it's so complicated to study.
In this study, it'll analysis the portal axle by using finite element method (FEM),
modal analysis will simulated on three different combinations of gear train system, the
three gear trains being analyzed are: gear train without idler gear, one idler gear and two
idler gears.
FEM static stress analysis will also simulated on three different gear train to study
the gear teeth bending stress and contact stress behavior of the gear trains in different
angular positions from °0 to °18 degree.
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.
In this paper the effect of the distinctive properties of Shape Memory Alloy (SMA)
―the ability to undergo large deformation and restore it after stress removal‖ has been
studied to see to what degree it may affect the structural performance of mul
ti-storey tall
buildings.
Using ANSYS software, two 3D Finite Element (FE) models are built for a
composite multi-storey building (20 story) which is resistant to lateral loads by bracing
system. One of them is with steel bracing and the other is with SMA bracing. Both models
take into account nonlinear material properties of elements and geometric nonlinearity.
The model with SMA material shows improved performance compared with the
model of steel bracing in terms of residual deformations and ductile performance.
In this paper, we will focus on the types of roof’s brick used
in construction and theoretically compare thermally between
different kinds in the local market, and finally we will propose a
new form of roof’s brick give the optimal insulation without
increasing the weight.
