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Register a new userA Study the Bond Stress between Concrete and Reinforcement Steel Using Numerical Modeling
دراسة إجهاد التلاحم بين البيتون و فولاذ التسليح باستخدام النمذجة العددية
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تم في هذه الدراسة تحليل نموذج بيتوني أسطواني بسيط مسلح بقضيب أملس منفرد في مركز الاسطوانة و نموذج مكعبي مسلح بقضيب محلزن منفرد في مركز المكعب و بتطبيق قوة شد على قضيب التسليح حتى الوصول إلى مرحلة الانهيار و ذلك باستخدام التحليل اللاخطي للعناصر المحددة ثلاثية الأبعاد باستعمال برامج التحليل الإنشائية المتقدمة ( برنامج ANSYS ) لدراسة إجهاد التلاحم بين البيتون و فولاذ التسليح.
In this research, a simple cylinder concrete model was analyzed. This model is simple and single in the center of cylinder for plain reinforcement and cubic model for deformed reinforcement. If we made a tension load on the reinforcement bar until we reach to the destruction by using non-linear analysis for the three dimension subjects by using the finite element ANSYS to study the bond stress between the concrete and the reinforcement.
References used
American Concrete Institute's., 2003- Bond and Anchorage, United States of America., 318(10),193-205
TEDOURI Sh.; DABAGH M.A.1998- structural of reinforcement concrete. Aleppo university publications, 1sted, Aleppo, 284
SAHYOUNI G.,1986-Modelisation Mecanique Avec Endommagement Progressif De La Liaison Acier-Beton Dans Un Cas Axisymetrique. Institut national des Sciences Appliquees deToulouse, 116
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This paper presents an analytical study of the Bond stress and its
relationship with relative slip between the concrete and steel using
finite element method.
Moreover, it presents a probabilistic study using statistics theory on
the data as a re
sult from analytical study to get the bond stress-slip
relationship, which represents the bond equation.
This research presents an experimental study behaviour of high strength concrete, for
evaluation of stress - strain curve and derivation of factors of equivalent compressive
stress block, we depend it in design of high strength concrete elements.
For this purpose, number of cylinders specimens with strength 60 MPa were prepared
and tested in compression, then curve was obtained.
The results showed the possibility of producing high strength concrete from local
materials and with strengths are highest than those were obtained, the resulting diagrams of
curve are shown to be essentially linearly elastic up to failure with a steeper declining
portion of the stress - strain diagram, which agree with the results of global researches, the
failure was almost sudden and rapid with increasing strength which shows that the highstrength
concrete less ductile than normal concrete at the failure. Curve of high strength
concrete differs from that normal concrete, this affects on the properties of rectangular
equivalent stress block which requires modifications on the factors led to optimum represent
for it and with evaluation of curve of the tested specimens, the diagram takes a
trapezoidal shape ( ), its value at the top is and the depth of the compressive
block is and we found and ( is average compression/cylinder
compressive strength of concrete, is ratio of the active depth that defined location of
compression force center), when concrete strength increases up , the diagram
shape will be closer to triangular than trapezoidal and then curve takes the shape of triangle its
value at the top is and the depth is and with replacing triangular diagram to rectangle.
يحتوي البحث على دراسة قمنا بها حول تاثير الانفجارات على منشآت البيتون المسح والسلوك الفعلي لهذه المنشآت نتيجة الأضرار الحاصلة.
بالاضافة لعملية تقييم السلوك الحاصل وتوقع المشاكل المستقبلية ودراستها باستخدام النمذجة الرقمية باعتماد برامج النمذجة.
A parametric study of pile load test requires a numerical modeling of this test and a study of the effect of each parameter of the material model used on pile load settlement curve shape and on the extrapolated value of pile ultimate bearing capacity
. Some real pile load tests are numerically modeled and calibrated using two types of material models: Mohr-coulomb MC and Hardening soil HS. The obtained results from HS are better than those obtained from MC, so material model HS is adopted to generate pile load settlement curves. It is shown that the relation between the extrapolated value of pile ultimate bearing capacity and each parameter of the material model used is linear, and there is only one value for each parameter of HS in which the calculated value of bearing capacity identifies with the normal value in DIN-Code. The main economic benefit obtained from this research is the ability of generating pile load settlement curves in addition to doing a parametric study using a numerical modeling method without any need to do pile load field tests. The practical scientific aim is to accumulate and collect information that can be used as a database for static pile load tests.
In line quenching and tempering has allowed ASCO (Arabian Steel Company) to
have higher ductility bar at higher strength levels compared with classic rebar production
with substantial reduction in alloy consumption by using heat treatment (thermex)
during
production proses on production line.
QTB (Quenching Tempering Bars) is an alternate means of strengthening long bars
by quenching the bars with water and then allowing the bars to self-tempering and
hardened case, the process is performed in line with the rolling process, after the
finishingarea. The process is stable and controlled, and it's effective on hardness and
strength properties on reinforced steel bars
The research has concentrate on Thermex and Thermex elements in finishing area of
rolling process.
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