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Article
Investigation of the Behavior for Reinforced Concrete Beam Using Non-Linear Three-Dimensional Finite Elements Model

Authors: Israa Kh. AL-Shimmari --- Nagham T.Hamad --- Waleed A Waryosh
Journal: Engineering and Technology Journal مجلة الهندسة والتكنولوجيا ISSN: 16816900 24120758 Year: 2011 Volume: 29 Issue: 10 Pages: 1870-1885
Publisher: University of Technology الجامعة التكنولوجية

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Abstract

This study presents theoretical investigation that reinforced concrete and composite construction might be suitably combined to give a new structural material: composite reinforced concrete. To study theoretically the composite beam, nonlinear three-dimensional finite elements have been used to analyze the tested beam.The 8-node brick elements in (ANSYS) are used to represent the concrete, the steel bars are modeled as discrete axial members connected with concrete elements at shared nodes assuming perfect bond between the concrete and the steel. The results obtained by finite element solution showed good agreement with experimental results.


Article
Experimental Investigation of Composite Steel-Concrete Arches
دراسة عملیة للأقواس المركبة الفولاذیة- الخرسانیة

Authors: Husain M. Husain --- Hisham M. Al-Hassani --- Ahmed Y. A. Zainul-Abideen
Journal: Engineering and Technology Journal مجلة الهندسة والتكنولوجيا ISSN: 16816900 24120758 Year: 2013 Volume: 31 Issue: 13 Part (A) Engineering Pages: 2393-2414
Publisher: University of Technology الجامعة التكنولوجية

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Abstract

This research is concerned with behavior of composite steel-concrete archesunder static load. For this purpose, eight models of composite steel-concrete archesare fabricated as test specimens.According to their supporting systems, the eightfabricated specimens are equally divided into Hinge-Roller and Hinge-Hingesupported arches in which varied numbers of shear connectors are used to investigatethe effects of support conditions and degree of shear connection on the behavior ofthe composite arches. The specimens are tested under monotonically increasing pointload applied on their crowns (on the top of concrete slabs).The mechanical properties of the used materials are determined by laboratorytests. Push-out tests on three specimens, fabricated for this purpose, are also carriedout to determine the properties of the stud shear connectors.It is concluded that increasing the number of connectors tends to increase theultimate load capacity and decrease both displacement and slip in the compositearches. This trend is considerably satisfied when the horizontal movements ofsupports are constrained (Hinge-Hinge supported arches).


Article
Dowel Action between Two Concretes
الفعل الوتدي بين خرسانتين

Authors: Hakim S. Muhammed --- Nazar K. Oukaili --- Husain M.Husain
Journal: Journal of Engineering مجلة الهندسة ISSN: 17264073 25203339 Year: 2009 Volume: 15 Issue: 2 Pages: 3583-3605
Publisher: Baghdad University جامعة بغداد

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Abstract

This paper reports eight tests in which in-plane shear forces are applied across the joint between two different concretes forming a composite action. Shear can be transmitted across the joint either by interlocking of the aggregate particles protruding from each face or by shearing of the reinforcement crossing the joint. Tests are conducted on initially cracked specimens by depending only on dowel action. The results of the tests are compared with theoretical results of the exponential equation presented by Millard and Johnson. The computer program of Al-Shaarbaf using the nonlinear behavior of concrete is used to perform the analysis with inclusion of the exponential equation for dowel action in the interface layer. The program uses 20-node brick elements with embedded bar elements. This program is also applied to Hofbeck et al. tests. The comparison shows that the experimental and the analytical results give good agreement where the difference between the two is between (2.5-5)% . The use of the exponential equation gives good results when the concrete is assumed to be initially cracked as in construction joints.

تم أجراء ثمانية فحوص سلطت فيها قوى القص عبر الشق أو الشرخ الموجود بين خرسانتين مختلفتين مكونتين للفعل المركب. يمكن نقل القص عبر الشق أما بتداخل حبيبات الركام البارزة من كل من وجهي الشق أو من خلال التسليح العابر للشق. أجريت الفحوص على نماذج متشققة ومعتمدة فقط على الفعل الوتدي. قورنت نتائج الفحوصات مع نتائج نظرية لمعادلة أسية قدمت من قبل ميلارد وجونسون. ولغرض أجراء التحليل الأنشائي فقد تم استخدام برنامج الشعرباف الآخذ بنظر الأعتبار ا السلوك اللاخطي للكونكريت وبالاعتماد على المعادلة ألأسية للفعل االوتدي للطبقة البينية. تم تطبيق البرنامج الذي يستعمل عناصر طابوقية ذات 20 عقدة مع عناصر قضبان مطمورة على فحوصات هوفبك وجماعته. قورنت النتائج التحليلية الحالية مع نتائج فحص هوفبك وجماعته وقد أعطت النتائج العملية والتحليلية مقارنة جيدة. أن أستعمال المعادلة ألأسية يعطي نتائج للطبقة البينية يعطي نتائج جيدة فقط حينما تكون الخرسانة متشققة مسبقا كما في المفاصل الأنشائية.

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