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Register a new userA Study on Factors Influencing Curvature Ductility of RC Shear Walls
دراسة في العوامل المؤثرة في مطاوعة الانحناء لجدران القص البيتونية المسلحة
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Added by
Damascus University ورقة بحثية
Publication date
2011
fields
Structural Engineering
and research's language is
العربية
Authors
حافظ الصادق( باحث )
Created by
Shamra Editor
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يعد تأمين المطاوعة في الجمل الإنشائية المقاومة للزلازل عاملاً رئيسياً في تبرير تخفيض القوى الزلزالية التي تصمم عليها هذه الجمل، و تعد جدران القص من أهم الجمل المستخدمة في تأمين المقاومة الزلزالية للأبنية. درِست في هذا البحث عدة عوامل يمكن أن تؤثر في مطاوعة الانحناء لمقاطع جدران القص و هذه العوامل هي توزع التسليح و نسبته في حالتي التسليح المنتظم و المركز في النهايتين و شدة الأحمال الناظمية المطبقة على الجدران و طول مقطع الجدار وخواص مواد الإنشاء. تبين النتائج أنه مع زيادة نسبة التسليح، تنخفض المطاوعة في جدران القص، ذات التسليح المنتظم و لكنها تبقى مستقرة في حالة التسليح المركز في النهايتين. أما تأثير شدة الحمولة الناظمية، فإن مطاوعة الانحناء تقل مع زيادة هذه الحمولة و تكاد تنعدم عندما تزيد الحمولة الناظمية على نصف الحمولة الناظمية القصوى المسموح تطبيقها.
Insuring structural system ductility is a main factor justifying the reduction made on design earthquake forces. Reinforced concrete shear wall is one of the most important systems used for earthquake resistance of buildings. In this research, many factors affecting curvature ductility of shear wall sections are studied. These factors are reinforcement ratio, reinforcement distribution (uniform and concentrated), axial force level, section length, and material properties. Results show that increasing reinforcement ratio, will reduce ductility in case of uniform reinforced shear walls, but it stays stable in case of concentrated reinforcement. As for axial force level, curvature ductility becomes lower as axial force increases and almost diminishes when it becomes more than half ultimate axial force bearing capacity.
References used
Three dimensional analysis and design of building systems, 2000, computers and structures inc., CA
الكود العربي السوري لتصميم وتنفيذ الإنشاءات بالخرسانة المسلحة 2004 وملحقاته، نقابة المهندسين السوريين، دمشق، سورية.
International Conference of Building Officials, Uniform Building Code (1997) , Whitter, CA
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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.
In the last two decades, the use of advanced composite materials such
as Fiber Reinforced Polymers (FRP) in strengthening reinforced
concrete (RC) structural elements has been increasing. Research and
design guidelines concluded that externally bo
nded FRP could increase
the capacity of RC elements efficiently. However, the linear stressstrain
characteristics of FRP up to failure and lack of yield plateau have
a negative impact on the overall ductility of the strengthened RC
elements. Use of hybrid FRP laminates, which consist of a
combination of either carbon and glass fibers, or glass and aramid
fibers, changes the behavior of the material to a non-linear behavior.
This paper aims to study the performance of reinforced concrete beams
strengthened by hybrid FRP laminates.
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.
The Steel/RC composite Column-beam connection joint is
considered one of the most important subjects in framed
construction. Ductility has the most influence among other
factors that control the behavior of this joint, and the nonlinear
behavior
of this joints when subjected to large and cyclic
loading is dominated by several parameters. These parameters
reflect the assembled components of the joint for every
component has a distinguished material and therefore specific
behavior under the loading corresponding to it.
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