اثر مقاوم‌سازی ستون بتن مسلح با جاکت فولادی سراسری در بارگذاری انفجار

ملائی, سمیه; پاکزاد, اسماعیل

اثر مقاوم‌سازی ستون بتن مسلح با جاکت فولادی سراسری در بارگذاری انفجار

نوع مقاله : مقاله پژوهشی

نویسندگان

¹ استادیار گروه مهندسی عمران دانشگاه بناب

² گروه مهندسی عمران، دانشکده فنی مهندسی، مؤسسه آموزش عالی اشراق بجنورد، بجنورد، خراسان شمالی، ایران

چکیده

اغلب اثر مخرب انفجار در سازه‌ها به صورت خرابی موضعی اعضای سازه‌ای بوده که می‌تواند با تخریب پیش‌رونده همراه شود. تخریب پیش‌رونده، که سبب تلفات گسترده جانی و مالی در زمان انفجار است، می‌تواند در اثر فروریختن و حذف ناگهانی ستون‌های سازه‌ای تحت فشار مستقیم انفجار روی دهد. بنابراین بررسی پاسخ انفجاری ستون‌ها و مقاوم‌سازی آن‌ها اطلاعات بسیار مفیدی را دربر خواهد داشت. در این پژوهش با یک روند مد‌ل‌سازی صحت‌سنجی شده، ستون بتن مسلح با حل‌گر صریح نرم‌افزار ABAQUS تحت انفجار تحلیل شده و نسبت به تقویت آن با جاکت سرتاسری فولادی به ضخامت‌های mm 4/2 و 6 اقدام شده است. با انجام تحلیل‌های دینامیکی غیر خطی، پاسخ مدل‌های ستون‌ تقویت شده و تقویت نشده تحت اثر بار از لحاظ مقادیر حداکثر تغییر مکان و انرژی جذب شده انفجار با یکدیگر مقایسه می‌شود. نتایج حاصل نشان می‌دهد که مقاوم‌سازی ستون بتن مسلح با جاکت فولادی، با کاهش تغییر شکل و انرژی رسیده به سازه، عملکرد آن را در برابر بارگذاری انفجار به صورت قابل توجهی بهبود می‌دهد.

کلیدواژه‌ها

20.1001.1.20086849.1399.11.2.7.8

عنوان مقاله [English]

Effects of RC Columns Strengthening by Steel Jacketing under Blast Loads

نویسندگان [English]

S. Mollaei ¹
E. Pakzad ²

¹ Assistant professor, Civil Engineering, University ob Bonab

² Department of Civil Engineering, Faculty of Engineering, Eshragh Institute Of Higher Education, Bojnourd, the Northern Khorasan, Iran

چکیده [English]

Most of the destructive effects of blast loading on structures can be found in the form of local failure of structural members. Such local damages could be associated with progressive collapse of the whole building. Progressive collapse, which has caused widespread casualties and financial losses at the blast events, can occur as a result of the sudden collapse and removal of structural columns under direct effect of the blast pressure. Therefore, assessment of the blast response of RC columns and their retrofitting against blast loading would provide very useful information in the field of blast resistant structures. In this paper, using a validated FE modeling process, square RC columns and RC columns strengthened with steel jacketing under blast loading, are analyzed by the explicit solver of ABAQUS software package. By performing nonlinear dynamical analyses, the explosive response of simple and strengthened RC column models are compared in terms of maximum displacement values and absorbed energy. Obtained results show that retrofitting of RC columns with steel jackets, significantly reduces the energy reaching the structure and the deformation, and improves the performance against blast loading.

کلیدواژه‌ها [English]

Reinforced Concrete Column
Blast Loading
Strengthening
Steel Jacketing

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