دراسة عددية لأعمدة خرسانية مسلحة مربعة مقواة بألياف الكربون تحت ضغط محوري مع عيوب هندسية أولية

محتوى المقالة الرئيسي

Ali Majid Mousa
Salah R. Al Zaidee

الملخص

تُعدّ الأعمدة الخرسانية المسلحة ركيزة أساسية في المدن الحديثة؛ ويتطلب نمذجتها العددية معالجة دقيقة للعيوب الهندسية الأولية وتأثيرات الحصر لتمثيل سلوكها الإنشائي بشكل واقعي. تصف هذه الدراسة إطار عمل لتحليل العناصر المحدودة (FEA) تم تطويره في برنامج Abaqus/CAE، خصيصًا لدراسة السلوك المحوري لأعمدة خرسانية مسلحة مربعة قصيرة ونحيلة بالحجم الطبيعي، مع وبدون تسليح عرضي داخلي (روابط). تتضمن النماذج حصرًا خارجيًا باستخدام غلاف من البوليمر المقوى بألياف الكربون (CFRP)، وتمت دراسة حالات مختلفة من العيوب الكلية والمحلية لتقييم تأثيرها على المقاومة والمطيلية. تمت معايرة النتائج وفقًا لأحكام الكود من خلال مقارنة النتائج العددية بمخطط تفاعلي مُستمد وفقًا لمتطلبات التصميم ACI 318-25 و ACI PRC-440.2-23. أظهرت الدراسة أنه مع ازدياد سعة العيوب، تنخفض مقاومة ومطيلية الأعمدة الخرسانية المسلحة القصيرة والنحيلة، بغض النظر عن الحصر. بالنسبة للأعمدة القصيرة المعرضة لضغط محوري، يمكن تحقيق توافق جيد مع تنبؤات الحمل المحوري الاسمي المستندة إلى الكود دون الحاجة إلى مراعاة العيوب الصريحة، شريطة عدم تضمين عامل تخفيض المقاومة وتجاهل الانحرافات العرضية. في المقابل، بالنسبة للأعمدة النحيلة، تُعد العيوب عاملاً أساسياً في إحداث تأثيرات النحافة، لا سيما في حالات العيوب الكلية ذات شروط الحدود المفصلية.

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تفاصيل المقالة

القسم

Articles

كيفية الاقتباس

"دراسة عددية لأعمدة خرسانية مسلحة مربعة مقواة بألياف الكربون تحت ضغط محوري مع عيوب هندسية أولية" (2026) مجلة الهندسة, 32(5), ص 93–115. doi:10.31026/j.eng.2026.05.05.

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