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Article
Experimental Behavior of Self Compacting Concrete Corbels Strengthened with External CFRP

Authors: Sarmad Sh. Abdulqader --- Basil S. Al-Shathr --- Ali Kh. Hasan
Journal: Engineering and Technology Journal مجلة الهندسة والتكنولوجيا ISSN: 16816900 24120758 Year: 2018 Volume: 36 Issue: 2 Part (A) Engineering Pages: 154-162
Publisher: University of Technology الجامعة التكنولوجية

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Abstract

This research aims to study the influence of using Carbon Fiber Reinforced Polymer (CFRP) strips as an external strengthened and repairing material on the behavior of self-compacting concrete (SCC) Corbels. The experimental work involved testing twenty self-compacting concrete corbels specimens. The experimental work is divided into two parts; the first part consists of three groups to investigate the most effective direction, position, bonding type and amount of CFRP strips on the behavior of corbels and utilized it in practice, also to strengthen new variables that are investigated in the second part. Two groups in part one are strengthened with different numbers of inclined and horizontal direction of CFRP strips, while in the third group the specimens were strengthened with strips of CFRP having different directions and bond types to improve the strength capacity and behavior of corbels. This improvement is represented by increase cracking load by about (94)% and increase in their ultimate load capacity of strengthening corbels which varies from about (19 to 88)%. While the second part of experimental work included the following variables: shear span to effective depth ratio (a/d), amount of horizontal steel reinforcement stirrups and repaired damaged corbels. The reinforced concrete corbels in this part were strengthened and repaired by CFRP strips depending on optimum result that is produced from part one wherefrom position, direction and amount are considered. It was found for un-strengthened and strengthened corbels having same horizontal secondary reinforcement stirrups that when (a/d) ratio decreases from 0.65 to 0.4 causes increase in cracking and ultimate loads reach (55)% and (35.41)% respectively. For un-strengthened and strengthened corbels having same (a/d) ratio, it was found an increase in cracking load which varies from (6.66 to 34.78)% and from (18.18 to 52.63) % in ultimate load when horizontal secondary reinforcement stirrups are increased. It was also found repairing SCC corbels with CFRP strips causes an increase in ultimate load reaching up to (50)% with respect to un-strengthened specimens. From results it is concluded that strengthened or repaired corbels present stiffer load deflection response than corresponding un-strengthened corbel (control corbel).

Keywords

Corbel --- Strengthen --- SCC --- Carbon Fiber.


Article
Structural Behavior of Composite Castellated Steel Concrete Beams Subjected to Impact Load

Authors: Shereen Q. Abdulridha --- Haitham H. Muteb --- Sarmad Sh. Abdulqader
Journal: Journal of University of Babylon مجلة جامعة بابل ISSN: 19920652 23128135 Year: 2018 Volume: 26 Issue: 8 Pages: 1-12
Publisher: Babylon University جامعة بابل

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Abstract

The structural behavior of composite castellated steel concrete beams subjected to impact load presented in this study. In which fabrication of composite castellated steel self-compacting concrete beams which connected to self-compacting concrete by means of stud shear connectors. Four composite castellated beams were performed with different degrees of castellation, they were 0%, 25%, 33.8% and 50%. These specimens were subjected to an impact load produced from free falling of steel ball. The experiments required fabrication of special rig which connected with different sensors and programmed by Lab VIEW 2016 program. Different parameters were recorded and discussed which involved force-time history and displacement history for the tested beams. It is founded that the increase of the degrees of castellation for the adoptedspecimens will increase the maximum impact load by about 16.13%, compared with non-castellated composite specimen. The amplitudes of vibration represented by displacement have decreased with the increasing of degrees of castellation by about 3.51%, 14.04% and 20.18% for the degrees of castellation 25%, 33.8%, and 50% respectively.

تشملالدراسةالحالية تصنيعالعتباتالمعرشةالتيترتبطبالخرسانةذاتيةالانصهاربواسطةوصلاتربطلدراسةسلوكهاتحتتأثيرالاحمال الصدمية. تمتنفيذأربعةعتباتمركبةومعرشةبدرجاتمختلفةمنالتعريش هي 0% و25٪ و33,8٪ و50٪. تعرضتهذهالعيناتلحملالصدمةالناتجةعنالسقوطالحرللكرةالفولاذية.تطلب اجراء الفحوصات المختبرية تصنيع جهاز خاص تم توصيله بمتحسسات مختلفة وتمت عملية برمجتها باستخدام برنامج Lab VIEW 2016.تمتسجيلومناقشةمعاملاتمختلفةوالتيتضمنتمخطط القوةمع الزمن ومخطط الانحراف مع الزمن للحزمالتيتماختبارها.زادالحدالأقصىللحمل الصدميمعزيادةدرجاتالتعريشالتيتمتبنيهابنسبة 16,13٪ تقريبًا. وقدانخفضتسعةالاهتزازالمتمثلةفيالانحرافمعزيادةدرجاتالتعريشبنسبة 3,51٪ و14,04٪ و20,18٪ لدرجاتالتعريش 25% و33,8% و50% على التوالي.

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