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Home>Products>Journal and Reviews>I.RE.C.E.>Latest issue
International Review of Civil Engineering - September 2012 (Vol. 3 N. 5) - Papers
International Review of Civil Engineering - Papers
Abstract - Box
foundations consist of two parts: 1- the upper part is reinforced
concrete slab, 2- the lower part is reinforced concrete wall penetrated
in the supported media. , the numerical analysis carried out as
parametric studies to investigate the advantages and the effects on
bending moments, total displacements and differential settlements. The
study concluded that Bending Moments: the positive bending moments on
the connections region between the flat plate (raft) and the walls will
be increased when the wall depth and thickness increased, the negative
bending moments within the foundation will be decreased when the wall
depth and thickness increased, on line C the bending moments approaching
to zero value when the wall thickness increased, while it will be
changed to positive values when the wall depth increases. Total
Displacements beneath the foundation will be decreased, the largest
decrease occurs in the middle region. Differential Settlements will be
decreased, the largest decrease occurs in the case when we increase the
wall thickness.
Keywords: Box Foundations, Bending Moments, Total Displacements and Differential Settlements.
Abstract - The
different vertical bracing configuration at each direction of steel
jacket offshore platforms with float over Deck installation system
affected to the seismic behavior of structure. This paper presents the
results of seismic assessment of a newly designed steel jacket offshore
platform with float over deck installation system in Persian Gulf. For
this purpose, the incremental nonlinear dynamic analysis of the platform
in both directions is performed by considering structure-pile-soil
interaction and nonlinearity in material and geometry of structural
elements. The demand, capacity, and evaluation confidence levels are
used for seismic assessment of this structure. The uncertainty is also
considered in the estimating seismic hazard, structural response and
capacity. The results show that platforms with FOD system could not
satisfy API-RP-2A design requirements in direction that braces are
removed for float-over deck installation operation. So, the new bracing
system was proposed for weak directions to improve the platform seismic
performance.
Keywords: Steel Jacket Offshore Platform, Float-Over Deck, Demand, Capacity, Confidence Level.
Abstract - This paper presents the results of laboratory model tests carried out to develop the ultimate bearing capacity of a strip footing stiffened with ribs connected to its lower surface on cohesive soil. Several parameters were considered, number, depth, and width of the ribs for different clay consistency, in order to extraction a new factorto the general bearing capacity equation with effect of ribs into consideration. The results indicate that the ultimate bearing pressure of the strip footing with ribs on clayey soil is greater (20-25)% than that of the strip footing without ribs, while, the settlement (at the same stress magnitude) of the strip footing with ribs is less than that strip footing without ribs. Copyright © 2012 Praise Worthy Prize S.r.l. - All rights reserved
Keywords: Cohesive Soil, Ribs, Strip Footing, Ultimate Capacity Factor.
Abstract - Though
thin walled steel members will locally buckle at low shear loads, they
may exhibit substantial post-buckling capacity. The current cold-formed
steel design code, however, does not recognize the potential
post-buckling shear strength of webs, though post-buckling shear
strength of stiffened webs is considered in structural plate girder
design. The objective of this study is to quantify the post-buckling
shear strength of slender un-stiffened webs. The finite element method
based numerical investigation considered the behavior of un-stiffened
simply-supported rectangular steel plates subjected to in-plane shear
loadings experiencing buckling, post-buckling, and yielding until
failure. The model employed representative material model, initial
geometric imperfections and large deflection analysis. The investigation
established the ultimate shear strength of such plates having different
parametric dimensions, and compared such results with the strength
values based on the current cold-formed steel design code provisions.
For slender plates, the current code uses the shear buckling load as the
design strength, whereas the analyses indicated significant
post-buckling strength. This paper establishes the shear design
equations incorporating the post-buckling capacity of un-stiffened steel
plates.
Keywords: Cold-Formed Steel, Thin-Walled, Finite Element Analysis, Post-Buckling, Shear Strength.
Abstract - Under
various fire scenarios, both heat transfer analysis and structural
analysis are required to assess fire resistance of reinforced concrete
member. For heat transfer analysis, Finite element method and Finite
difference method are complicate for practical use. To simply predict
temperature in concrete slab, the energy based method is a simplified
FDM based on the predetermined temperature profile and the energy
conservation. However, the method provides an inaccurate temperature
prediction. To improve the prediction accuracy, this study reformulates
the energy based method and investigates a suitable predetermined
temperature profile. Furthermore, to facilitate design engineers, the
method is proposed as a simple spreadsheet calculation. Through the
empirical study of the FEM temperature profile, the exponent is found to
be logarithmic proportional to the ratio of the lowest temperature to
the highest in concrete slabs. The power function with variation of the
exponent provides the better accurate temperature prediction. Comparing
with FEM analysis and experimental results, the spreadsheet calculation
is validated for temperature prediction of concrete slab under various
fire loads.
Keywords: Concrete Slab, Energy Based Method, Fire Loads, Spreadsheet Calculation, Temperature Prediction.
Abstract - Recent
developments in fiber production technology allow fiber to be made from
basalt rock. Basalt fiber has many attractive physical and mechanical
properties. An automated wet lay-up process was used to make basalt
fiber reinforced polymer (BFRP) bars. The objective of this study was to
investigate if the mechanical properties of BFRP bars manufactured by
using the new process are suitable for reinforced concrete applications.
Reinforcing bars of three sizes were tested. The mechanical properties
obtained were found to be comparable to those obtained for glass FRP
bars. The tensile strength, modulus and rupture strain of these BFRP
bars were found to be in the ranges that are suitable for civil
engineering applications.
Keywords: Automated Wet Layup, Basalt FRP Bars, Modulus, Tensile Strength, Ultimate Strains.
Abstract - This
article presents the development of a law of visco-elastic behaviour
with one-sided damage for the bituminous materials, based on the
observation of the essays of direct break on film of asphalt between two
hemispheres of metal. The essays of fatigue of the bituminous materials
realized on test tubes lead a loss of rigidity combined in a significant
extension of test tubes at the beginning of the essay for strong levels
of solicitation. It will also present a structure design of the asphalt
pavement in Japan.
Keywords: Binding Hydro-Carbonned, Asphalt Pavement, Visco Elastic, Fatigue Life, Microcracks, Law Of Behaviour, Rutting, Numerical Simulation.
Abstract - The piezoelectric materials have become indispensable in many technological applications. Nowadays, they are present in many applications fields such as in applied mechanics, aeronautics, biomechanics and civil engineering in order to control their behavior and predict their life span. These materials have an inverse piezoelectric effect which allows them to control the form and to present any neither noise nor vibration at any time or position on the structure. In this study we are interested in the bending behavior analysis and modelling of a ceramic beam under external solicitations using numerical simulations based on the finite element methods. The modelling permit to simulate the deformations in a piezoelectric ceramic beam subjected to an electric field and to simple mechanical stress taking into account the electromechanical coupling. It has been found that the obtained analytical results are in a very good agreement with those obtained by numerical modeling. As a result, the interest of such modelling analysis allows the design, the conception and the optimization of mechanical systems based on piezoelectric elements. These materials known as smart or “intelligent” materials, are often used to measure and/or to control finite deformations or vibrations in mechanical systems, so that to prevent their plastic deformations or their total failure. Copyright © 2012 Praise Worthy Prize S.r.l. - All rights reserved
Keywords: Piezoelectric Material, Ceramic Beam, Intelligent Structure, Finite Elements Modelling.
Abstract - The
objective of this paper is the application of a new non-iterative
spectral method to nonlinear systems for the design or verification of
seismic structures subjected to seismic action. This method uses a
direct design procedure based on the displacements method, in which the
maximal allowed displacement and the building vulnerability are
initially defined, instead of sizing on the basis of the method of
forces, usually adopted by seismic codes. This method is applied in the
design of a supermarket building within the city of Rabat, Morocco. The
Morocco seismic code RPS2000 imposes a 5 cm joint between adjacent
buildings thus, limiting the buildings maximum allowed displacement to
2.5 cm. Based on this displacement limit and on the building spectral
capacity curve, we have chosen the building ductility for a 2.5cm
displacement at the performance point.
Keywords: Capacity Curve, Capacity Spectrum, Performance Point, Fragility Curves, Risk Assessment, Vulnerability.
Abstract -
Nanotechnology is become one of the method to produce and develop a
green building. Many definition of green building was created today. In
this paper, it was presented a green building that used a nanotechnology
to produce an understanding microstructure of material. This material is
used to develop a high potential structure that can be used in high rise
building. By using this material, sustainability is the capability of a
material or design to endure. In biological science, it was define as
how the system remained diverse and productive versus time period. For
human being, it was described as a potential of long term period of
maintenance where it was environmental, economic and many more. This
paper describes more on energy and cost in design high rise building to
endure. The proposed design agrees that the distribution load and
strength of structure is two times higher compared with the conventional
structure. According to this result, the sustainability is achieved in
word of economic design.
Keywords: High Rise Building, Sustainability, Cost, Potential.
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