NON-LINEAR FINITE ELEMENT MODEL FOR REINFORCED CONCRETE DEEP BEAMS FAILING IN SHEAR

Six reinforced concrete deep beams, previously tested, are analyzed using 3D nonlinear finite element methods. These beams were tested under a vertical monotonically increasing load till failure. Two beams specimens were having flexure reinforcement only, two were with shear reinforcement, and two with shear and side reinforcement. All specimens are analyzed using the concrete damaged plasticity model offered in ABAQUS software. Damage can be introduced in this model and it is defined separately in compression and tension. The model is also provided with viscosity parameter that provides additional ductility in the structure and helps to overcome convergence problems. The effect of mesh size, dilation angle, and viscosity parameters are also studied. All numerical results are compared to the test results in terms of load-deflection responses, failure mode, and crack patterns. Finite element analysis results are in good agreement with the experimental results and can give an insight into the failure mechanisms and crack developments of each beam. The predictive ability of the calibrated models confirms their ability for parametric studies examining the shear behavior of reinforced concrete deep beams with and without shear reinforcement.
 
في هذا البحث، تم عمل نموذج عددي غير خطي باستخدام طريقة العناصر المحددة لتمثيل الکمرات الخرسانية العميقة التي تنهار تحت أحمال القص. تم مقارنة النموذج بنتائج اختبارات عملية سابقة لستة کمرات. وأثبتت المقارنة دقة النموذج العددي وقدرته على التنبؤ بالحمل الأقصى والسلوک ونوع الانهيار. تم أيضاً معايرة لقيم بعض معاملات النموذج العددي والتي تؤثر على النتائج في حالة إدخالها بقيم غير واقعية. حيث أوصت الدراسة أن تکون قيمة زاوية الاحتکاک الداخلي للخرسانة 36 درجة ومعاير اللزوجة للنموذج 0.01.