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Register a new userStudy of the shear strength equations of reinforced concrete beams with and without steel fibers and suggestion an equation to the case of lightweight concrete
دراسة علاقات مقاومة القص للجوائز البيتونية المسلحة بالألياف الفولاذية و بدونها و اقتراح علاقة لحالة البيتون الخفيف
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يقدم هذا البحث سلوك القص لجوائز البيتون الخفيف بدون تسليح عرضي و المصنع باستخدام حصويات السكوريا الخفيفة. تم اختبار تسعة جوائز تحت تأثير حمولتين متزايدتين حتى الانهيار، و هي ثلاثة جوائز من البيتون الخفيف بدون ألياف و ستة جوائز أخرى تم تسليحها بالألياف الفولاذية.
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.
References used
ACI Committee213R-03, 2003-Guide for Structural Lightweight Aggregate Concrete. American Concrete Institute, 38p
Slater, E; Moni, M; Alam, S. 2012- Predicting the shear strength of steel fiber reinforced concrete beams. Construction and Building Materials. Vol. 26, 423–436
Shoaib, Abdoladel; 2012- Shear in Steel Fiber Reinforced Concrete Members without Stirrups. Doctorate thesis, the Faculty of Graduate Studies and Research, Edmonton, Alberta, Canada
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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 .
Thepaper studies the mechanical properties ofsteel fibers reinforced lightweight
concrete.This kind of concrete is produced by usingscoria aggregateswhich can be found
abundantly in Syria. Thelightweight concrete mixeswere designed for three differ
ent
percentage of steel fibers (0, 0.5, 0.75)%.
Different tests were performed to determine mechanical properties of product
concrete such as compressive strength, elasticity modulus, splitting tensile strengthand
flexural strengthalso; the stress–strain diagram of produced lightweight concrete was
established under compression.
The results showedanincrease of the compressive, splitting tensile and flexural
strengths reach up 16.9%, 25.6%, and 53.6% respectivelywhen the steel fibers were used.
Also the results indicated the importance of using the steel fibers to improve the
performance of concrete and change its brittle behavior to ductile behavior.
Structural Frame system is considers as an earthquake resisting structural
systems. On the other hand, many techniques were used to improve the
resistance against lateral loads. where Steel Plate Shear Wall fixed within
frame span is one of those
techniques.
This research aims to develop the Strip model of Partial Steel Plate Shear
Walls with Reinforced-Concrete Frame with opening parallel to beams.
The research includes an analytical study using the finite element method for the reinforced concrete beams containing holes in the body. These tested trophies have a rectangular cross-section and without additional armament in the area of the hole,
and two patterns (patterned and simple support) were studied. As for the holes, they are rectangular in shape with variable dimensions, where prizes with one hole and prizes with two holes were chosen.
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 ca
lculated 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.
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