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STUDYING THE BEHAVIOR OF THE PILE CAP FOR SHEAR REINFORCEMENT WHICH IS SIMULATED AS A CONTINUOUS DEEP BEAM USING SELF COMPACTING CONCRETE

Author: Zuhair Abd Hacheem
Journal: Journal of Engineering and Sustainable Development مجلة الهندسة والتنمية المستدامة ISSN: 25200917 Year: 2017 Volume: 21 Issue: 5 Pages: 88-100
Publisher: Al-Mustansyriah University الجامعة المستنصرية

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Abstract

This paper is focused on the effect of shear reinforcement on the structural behavior of continuous reinforced concrete deep beams to employ the results on the piles caps works. Experimental study using self-compacting concrete with constant compressive strength nominally equals 60 MPa were frequently used with three groups of shear span-to-depth ratios 0.95, 1.08 and 1.25 to produce twelve continuous beams. Each group of shear span-to-depth ratios has one unreinforced beam against shear stresses and three shear reinforced beams; the first is consist of horizontal stirrups only, the second has vertical stirrups only while the third from combined with horizontal and vertical stirrups to act together against shear stresses. The results revealed that the configuration of the combined shear reinforcement (horizontal and vertical) is an effective factor on the behavior of the deep beam and when it is increased in one category the ultimate strength and the serviceability of specimen can be improved. The percentage of the obtained improvement for a specimen can be increased by decreasing its shear span-to-depth ratio.

تركز هذه الورقة البحثية على تأثير تسليح القص على السلوك الإنشائي للعتبات الخرسانية المسلحة العميقة المستمرة لغرض الاستفادة من النتائج في أعمال قبعات الركائز. وقد استخدمت الدراسة العملية الخرسانة ذاتية الرص ذات مقاومة انضغاط ثابتة المقدار وقيمتها الإسمية تساوي 60 ميكا باسكال وتم تكرارها في ثلاث مجموعات من نسب فضاء القص-إلى-العمق وهي 0.95، 1.08 و 1.25 لغرض إنتاج اثنى عشر عتبة مستمرة. كل مجموعة من نسب فضاء القص-إلى-العمق تتكون من عتبة غير مسلحة تجاه إجهادات القص وثلاث عتبات مسلحة تجاه القص؛ الأولى مزودة بأطواق أفقية فقط والثانية مزودة بأطواق عمودية فقط أما الثالثة فزودت بكلا الحلقات الأفقية والعمودية لتعمل سوية تجاه إجهادات القص.كشفت النتائج عن كون ترتيب تسليح القص بزيادة التسليح إلى خليط من الحلقات الأفقية والعمودية هو عامل مؤثر على سلوك العتبات العميقة كما ويمكن تحسين المقاومة القصوى وقابلية الخدمية للنموذج. أن نسبة التحسن المئوية المستحصلة لنموذج معين يمكن زيادتها بتقليل قيمة نسبة فضاء القص-إلى-العمق لذلك النموذج.


Article
Studying the Strength of the Pile Cap Concrete Simulated as a Continues Deep Beam using Self Compact Concrete

Author: Zouhear A. Hachem
Journal: DIYALA JOURNAL OF ENGINEERING SCIENCES مجلة ديالى للعلوم الهندسية ISSN: 19998716/26166909 Year: 2018 Volume: 11 Issue: 2 Pages: 42-48
Publisher: Diyala University جامعة ديالى

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Abstract

This paper is an experimental study to investigate the effect of concrete compressive strength on the structural behavior of continuous reinforced concrete deep beams to utilize the results on the piles caps works. Three nominal concrete compressive strengths 50, 60 and 70 MPa obtained by self-compacting concrete were frequently used with four groups of shear span-to-depth ratios 5.71, 1.25, 1.08 and 0.95 to produce twelve continuous beams; three of them are shallow and the rest are deep. The comparisons were designed to reveal the variation in the structural behaviors among the shallow and deep specimens from a side, and among the deep specimen from another side. The experimental program concentrated on the ultimate strength, load-deflection curve, cracking and failure mode of the specimens. The results revealed that the concrete compressive strength is an effective factor on the behavior of the deep beam and when its value increased the ultimate strength and the serviceability of specimen can be improved about 48% whilst the enhancement achieved in shallow beams about 9%. The percentage of the obtained improvement for a specimen can be increased by decreasing its shear span-to-depth ratio.

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