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Article
Experimental and Numerical Investigation on The Punching Behavior of High Strength R.C Flat Slab Under Repeated Load

Authors: Nameer Abdul-Ameer Alwash --- Ghalib Mohsin Habeeb --- Hussein Talab Nhabih
Journal: Journal of University of Babylon مجلة جامعة بابل ISSN: 19920652 23128135 Year: 2017 Volume: 25 Issue: 2 Pages: 497-494
Publisher: Babylon University جامعة بابل

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Abstract

In this paper, the punching behavior of square simply supported reinforced concrete flat slabs was experimentally and numerically investigated. Four models of reinforced concrete flat slabs were constructed and tested. The test variables were type of concrete and load (four models): High Strength Concrete flat slabs under monotonicload or repeated load (two models) and Normal Strength Concreteflat slabs under monotonicload or repeatedload (two models). The results showed that the punching shear strength of flat slabmodels increased up to 60% with the use of HSC. While, repeated load reduces the punching shear strength of flat slabmodels by about (34.4%-10%); it depends on the level of loading, number of cycles and type of concrete. Three-dimensional (3D) nonlinear finite element (NFE) analysis has been carried out to conduct the numerical investigation of the general behavior of HSC and NSC flat slab models. The ABAQUS model succeeded to an acceptable degree in predicting the structural behavior of the analyzed flat slabswith average of differences of about 5% between the predicted and experimental ultimate load.

تقدم هذه الدراسة تقصيا عمليا و تحليليا لسلوك ثقب السقوف المستوية الخرسانية المسلحة مربعة الشكل والمسندة بإسناد بسيط . تضمنت الدراسة انشاء وفحص اربعة نماذج للسقوف المستوية الخرسانية المسلحة. وتضمنت المتغيرات العملية نوع الخرسانة والحمل (اربع نماذج) : نماذج سقوف مستوية ذو خرسانه عالية المقاومة تحت تأثير حمل تزايدي اوتكراري (نموذجان) ونماذج سقوف مستوية ذو خرسانه اعتياديه المقاومة تحت تأثير حمل تزايدي او تكراري (نموذجان) . أظهرت النتائج بان مقاومه قص الثاقب لنماذج السقوف المستوية ازدادت الى حد 60% عند استخدام خرسانه عالية المقاومة . بينما قلل الحمل التكراري مقاومه قص الثاقب لنماذج السقوف المستوية بحوالي (34.4%- 10%), اعتمادا على مستوى التحميل, عدد مرات التحميل ونوع الخرسانة . التقصي التحليلي قدمأ نموذجا لاخطي ابالاعتماد على عناصر ثلاثية الأبعاد ملائمة لتحليل نماذج السقوف المستوية المصبوبة باستخدام خرسانة عالية المقاومة وخرسانة اعتيادية المقاومة . ان التحليل النظري المتبع في هذه الدراسة نحج الى درجة مقبولة في تنبأ السلوك الانشائي للسقوف المستوية التي تم تحليلها وبمعدل فروقات بحدود (5%) بين الحمل الأقصى المتوقع والعملي.


Article
FIEXURAL BEHAVIOR OF LIGHT WEIGHT CONCRETE SLAB PANELS REINFORCED WITH CFRP BARS

Authors: Nameer Abdul Ameer Alwash --- Ghalib Muhsen Habeeb --- Fatimah Hameed Naser Al-Mamoori
Journal: Al-Qadisiyah Journal for Engineering Sciences مجلة القادسية للعلوم الهندسية ISSN: 19984456 Year: 2017 Volume: 10 Issue: 4 Pages: 368-383
Publisher: Al-Qadisiyah University جامعة القادسية

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Abstract

The present study includes an experimental investigation of the behavior of simply supported lightweight aggregate concrete (LWAC) and normal weight concrete (NWC) square slabs reinforced by different ratios of carbon fiber reinforced polymer (CFRP) and/or steel bars reinforcement. The experimental program consists of testing nine two-way reinforced concrete square slab models under uniformly distributed load (UDL). They were of the same overall dimensions, (1050×1050×80) mm. The main variables considered in the experimental study are: type of concrete; LWAC or NWC, type of reinforcement; steel, CFRP and hybrid (steel and CFRP) bars with different ratios and arrangements, the behavior of slabs with bottom and top CFRP bars reinforcement and the efficiency of using CFRP bars for strengthening slabs in two directions by using near surface mounted (NSM) technique. In this study, a waste of clay bricks was used as a coarse lightweight aggregate (CLWA) to produce structural lightweight aggregate concrete (SLWAC).It was found that LWAC slab model reinforced by CFRP bars has a lower total weight by amount 20% in comparison with NWC slab model reinforced by CFRP bars with rather a small reduction in slab ultimate load capacity by amount not more than 6.5%. However, it was found that the CFRP reinforced LWAC slab model can achieve ultimate load capacity higher than equivalent steel reinforced LWAC slab model by about 34.62%. NSM technique by CFRP bars in two directions of LWAC slab is very effective and nearly provided the same efficiency of equivalent internal reinforcement.

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