ارزیابی عملکرد قاب خمشی جوشی با مقطع تیر کاهش یافته و سخت کننده

مهندسی عمران فردوسی

مقاله 3، دوره 36، شماره 3 - شماره پیاپی 43، مهر 1402، صفحه 29-46   

نوع مقاله: مقاله پژوهشی

شناسه دیجیتال (DOI): 10.22067/jfcei.2023.82042.1224

نویسندگان

محمدامین جلالی؛ امین رفیعی^*

گروه مهندسی عمران-سازه، دانشکده فنی و مهندسی، دانشگاه مراغه، مراغه، ایران

چکیده

در این پژوهش، تأثیر برش های بیضوی در جان، تأثیر برش های شعاعی در بال و نیز تاثیر وجود سخت کننده، بر رفتار تیر، بر رفتار اتصال و بر عملکرد قاب های خمشی فولادی مطالعه می شود. با روش اجزاء محدود و المان های سه بعدی در ABAQUS، تحلیل های استاتیکی غیرخطی قاب تحت بارگذاری چرخه ای انجام یافته و از معیار شکست فون میزز استفاده می شود. نتایج این تحقیق نشان می دهد در تیر بدون مقطع کاهش یافته بیشینه تنش ها و کرنش ها در جان تیر رخ می دهد و با ایجاد برش در جان، بیشینه تنش ها و کرنش ها به محل مقطع تیر کاهش یافته انتقال می یابد. نسبت مقاومت بیشینه به مقاومت در گام نهایی بارگذاری و نیز میزان انرژی مستهلک شده نشان می دهد، در مقایسه با اتصال با برش شعاعی، اتصال با برش بیضوی تنزل مقاومت کمتر و شکل پذیری بیشتری دارد.

کلیدواژه‌ها

تیر مقطع کاهش یافته؛ سخت کننده؛ بارگذاری چرخه‌ای؛ روش اجزاء محدود غیرخطی

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