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Register a new userStudying the effect of cross section shape on shear resistance of high strength concrete T beams, and developing a relationship to compute it´s shear
تأثير شكل المقطع على مقاومة القص في الجوائز البيتونية عالية المقاومة ذات المقطع T, و تطوير علاقة لحساب مقاومتها للقص
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حقق استخدام البيتون عالي المقاومة قفزة نوعية في تصميم و تنفيذ المنشآت البيتونية المسلحة، تناول البحث حساب مقاومة القص للجوائز البيتونية عالية المقاومة التي لا تحوي تسليح على القص و ذات مقاومة وسطية (MPa65) عن طريق إجراء تجارب مخبرية على هذه الجوائز (مستطيلة و ذات مقطع T) و دراسة تأثير شكل المقطع على مقاومة القص ، حيث تم قياس السهم في منتصف هذه الجوائز و من ثم مقارنة هذه القيم مع القيم الحسابية المقترحة بالبحث ، و تطوير علاقة لحساب مقاومة القص في الجوائز البيتونية عالية المقاومة ذات المقطع T.
Using high strength concrete made a big step in designing and constructing reinforced concrete structures. In this research, shear resistance of high strength concrete beams with average resistance of (65Mpa) and without shear reinforcement was calculated by making Experimental tests, also we studied the effect of cross section shape on shear resistance, and measured the deflection in the middle of the beams then we compared these results with the mathematical results and with results from other researchers, finally we developed a relationship to determine shear capacity in high strength concrete T beams.
References used
American concrete institute "ACI(2005) building code requirements for structural concrete(ACI318-05) and commentary (ACI 318R-05) .USA: Farmington Hills,Mich ACI committee 318
Bazant, Z.P and Kim, J.K . “The Size effect in shear Failure of longitudinally reinforced Beams” ACI Structural Journal Vol.81 (5). (1984) . pp.456-468
CSA CAN3-A23.3-1994," Design of Concrete Standards for Building ", Rexdale,Ontario, Canada,1994
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This research includes an experimental study and a nonlinear
analysis using the finite element method of reinforced concrete
beams with large opening in body that exist in shear zone . The
tested beams are simply supported with rectangular section
and
without additional reinforcement in opening region. The opening is
square in shape with variable dimensions and constant distance
from the support . Studying the effect of changing length of the
opening on the behavior of the reinforced concrete beams was
already completed. The modes of cracks , (load-deflection )
relationship, ultimate load and the mode of failure for all beams
were determinate . The study showed that existence an opening in
shear region of beams reduce the strength of beams and affect on
the mode of shear failure , and any addition in the depth of the
opening lead to early cracks , more deflections and less ultimate
failure load .
The horizontal Join beams with the slabs of reinforced concrete play the, the role of horizontal shear walls on the building height, Thus, the horizontal beams, columns and shear walls work together to form, the vertical resistance and horizontal loa
ds resulting from wind pressure or the intensity of earthquakes As a result to the great importance of the work of the join beams between wings of shear wall in the carrier wholesale of armed concrete، we have conducted experiments on shear wall and the result experiments compare with theory scientists and researchers in high- buildings. Been compared join beams with moment of stiffness constant in the level of its confluence with wings shear walls (Hold the forces of resistance horizontal dynamic plasticity in stage). And join beams in the form of crowns with moment of stiffness variable in the level of its confluence with wings shear walls.
We suggest a new theory with relationship for the change in the moment of stiffness join beams with crowns between wings of shear wall from reinforced concrete. Extract the experimental results and
compare them with the proposals of the new theory, and computational methods for global theories on the subject of search
And the impact of the work of the join beams with crowns between wings shear walls on the horizontal loads external pressure intensity of earthquakes or wind.
Beams are considered as one of the most loaded concrete elements, which needs to
be strengthened either as a result of insufficient of concrete section, or insufficient rebar or
increased loads, or the result of a superficial steel or corrosion of
internal steel
reinforcement, and other reasons that we will mention them what we need to study this.
The damaged structural elements and their inability to function fully as a result of exposure
to different environmental factors damage materials and lead to lower resistance, or
because of the existence of of an executive defects or inappropriate investment for its,
leads to the need to rehabilitate maintenance and repair or reinforcement. So it was
resorting to strengthen either magnify sections or supply necessary reinforcement or steel
platelets linking external supported well to concrete section, and because of the difficulty
of execution the recent studies has been implemented on the use of more efficient material
which is concentrated fiber reinforced polymers.
We will present here to methods of strengthening the shear up to the global studies
conducted using these materials from polymers, which are characterized by high resistance
to tensile and large resistance to environmental factors and weather conditions and ease of
application in the specified permissible sites.
This paper presents the shear behavior of lightweight concrete beams
without shear reinforcement produced by scoria aggregates. A total of nine
beams were tested under four-point loads, including three lightweight
concrete beams without steel fibers and six steel fiber reinforced
lightweight concrete beams.
Many techniques have been used in repair and strengthening of
reinforced beam, among which are external steel beams, external
pre- stressing, epoxy injection, additional concrete overlay, external
steel plates, additional longitudinal and transver
se - steel bars.
Fifteen R.C. beams were tested until failure and the deflection,
surface strains, internal steel strains, external steel strains and crack
patterns were measured, the results were analyzed and conclusions
were summarized. Finally, the recommendations were stated with
the needed future work.
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