مطالعه رفتار فروریزش سازه های مخروطی چند سلولی و بهینه سازی آن‌ها با استفاده از شبکه عصبی مصنوعی

نوع مقاله: مقاله مستقل

نویسندگان

1 استادیار، دانشگاه محقق اردبیلی، اردبیل

2 کارشناس ارشد، دانشگاه محقق اردبیلی، اردبیل

چکیده

در تحقیق حاضر، رفتار لهیدگی سازه‌های مخروطی چند سلولی تحت بارگذاری دینامیکی محوری بررسی شده است. این سازه‌ها مخروطی از دو جداره داخلی و بیرونی تشکیل شده‌ است که توسط چند صفحه تقویتی به همدیگر متصل شده‌‌اند. سازه‌های مذکور در پنج نوع سطح مقطع مربعی، شش‌ ضلعی، هشت ‌ضلعی، ده ضلعی و دایروی مورد بررسی قرار گرفته‌اند. قبل از انجام شبیه‌سازی‌های عددی رفتار لهیدگی سازه‌های مذکور با استفاده از نرم‌افزار ال‌اس-داینا، نتایج عددی با نتایج آزمایش‌های تجربی صحت‌سنجی شدند. پس از حصول اطمینان از درستی مدل اجزاء محدود ایجاد شده، شاخص‌های جذب انرژی ویژه (SEA) و بیشینه نیروی لهیدگی )‌ (F‌maxبرای همه سازه‌ها جهت پیدا کردن بهترین سازه از نقطه نظر عملکرد جذب انرژی محاسبه شدند. در ادامه با استفاده از روش شبکه‌ عصبی مصنوعی و الگوریتم ژنتیک، مقادیر بهینه ابعاد سازه‌های مذکور (شامل زاویه مخروط (Ө) و نسبت اندازه جداره داخلی به اندازه جداره بیرونی (S)) به دست آورده شدند. سپس از میان سازه‌های بهینه شده، بهترین سازه به کمک روش تصمیم‌گیری چند معیاره تاپسیس انتخاب گردید. نتایج نشان داد که سازه مخروطی دایروی دارای بهترین عملکرد با پارامترهای طراحی°94/3‌‌‌ θ=و 578/0‌‌‌ S=‌بوده و بنابراین به عنوان بهترین جاذب انرژی معرفی گردیده است. در پایان اثر تورفتگی قسمت داخلی سازه (جداره داخلی و تقویتی) بررسی شد و نتایج نشان داد که تورفتگی جداره داخلی نتیجه‌ مناسب‌تری دارد.

کلیدواژه‌ها

موضوعات


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