NONLINEAR FINFITE ELEMENT ANALYSIS OF REINFORCED CONCRETE CYLINDRICAL SHELLS AND FOLDED PLATES WITH EDGE BEAMS

الموضوعات

علوم تطبيقية وتكنولوجية

الملخص

This study deals with nonlinear large displacement analysis of reinforced concrete shells and folded plates by the finite element method. The 8, 41and 02-node brick element have been used to model the concrete. The reinforcing bars are modeled as axial members embedded within the brick element. Perfect bond between the concrete and the reinforcing bars was assumed to occur. The elasto-plastic strain hardening model followed by perfectly plastic response is used to simulate the compressive behavior of concrete. This response is terminated at the beginning of crushing. In tension, linear elastic behavior prior to cracking is assumed. A smeared crack model with fixed orthogonal cracks is adopted to represent the fracture of concrete. The nonlinear equations of equilibrium have been solved by using an incremental-iterative technique operating under load control. Modified version of the Newton-Raphson method has been employed. Various integration rules (02, 41a and 8points) have been used in the analysis of the applications presented in this study.A nonlinear geometrical model based on the total Lagrangian approach and taking into account Von Karman assumptions is considered. The study was applied on reinforced concrete shell structures and folded plates including edge beams to test the validity of the program in the analysis. A good agreement has been achieved between the examples analyzed in this research work and their published experimental and theoretical results. Also the study included effect of some parameters on the behavior of shell and folded plate structures. The parameters include; change of the thickness, edge beams height, change of the reinforcement ratio and some other parameter. Based on the results of this work, the ultimate collapse load was very sensitive to the variation in the angle of shell. When the shell angle () increased from 82oto 482o, the failure load increased from 1.94kN to 41.94kN. From the results obtained, it was found that the ultimate load of the cylindrical shell could be increased up to 098.times when the thickness of shell increased from 42mm to 42mm.The increase in the height of edge beam gave significant increase in the ultimate load especially when the shell angle is increased. A noticed enhancement is gained from increasing the steel reinforcement by increasing the ultimate load carrying capacity and the ultimate deflection. For The folded plate, the inclination angle has also significant effect on increasing or decreasing the ultimate load. The ultimate load is decreased 29.4times, when the inclination angle is increased from 42oto 02o. The increasing in the percent of short direction steel reinforcement to 0222anincreasein the failure load equals to 4102. Two simplified equations to determine the ultimate collapse load for cylindrical shells and folded plates were suggested to calculate the collapse load of these structures for different cases which were explained in chapter five

روابط وملفات

التعريف والنوع

رقم الوثيقة

085808e3-2fdb-40db-8816-baabab949410

رقم العقد

0

نوع الوسائط

Crawler

نوع المحتوى

الرسائل العلمية

صيغة المصدر

رسائل ماجيستير

نوع الملف

pdf text

أسماء الملفات

1002328_1.pdf

بيانات النشر

ترجمة العنوان

التحليل اللاخطي بالعناصر المحددة للقشريات الاسطوانية والصفائح المطوية من الخرسانة المسلحة مع أعتاب طرفية

ألقاب المؤلفين

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اللغة

English

المصدر والدورية

اسم المصدر

NONLINEAR FINFITE ELEMENT ANALYSIS OF REINFORCED CONCRETE CYLINDRICAL SHELLS AND FOLDED PLATES WITH EDGE BEAMS

المحتوى والصفحات

عدد الصفحات

0

كلمات الباحثين

Nonlinear analysis, Large displacements, Reinforced concrete shells, Folded plates, Finite element method, Reinforced concrete, Smeared crack model, Ultimate collapse load

إشراف وإعداد

الإشراف

مصطفى بلاسم, نمير عواش

الإعداد

ميثم كريم الطائي

الاقتباسات الببليوغرافية