بهبود رفتار لرز ه ای قابهای مهاربندی همگرا با استفاده از یک میراگر حلقه ای نوین

مهندسی عمران فردوسی

مقاله 2، دوره 38، شماره 3 - شماره پیاپی 51، مهر 1404، صفحه 23-44   

نوع مقاله: مقاله پژوهشی

شناسه دیجیتال (DOI): 10.22067/jfcei.2025.88926.1314

نویسندگان

یاشار بخشایش¹؛ فرشته امامی^{* 2}

¹گروه مهندسی عمران، واحد علوم و تحقیقات، دانشگاه آزاد اسلامی، تهران، ایران

²گروه مهندسی عمران، دانشکده عمران، معماری و هنر، واحد علوم و تحقیقات، دانشگاه آزاد اسلامی، تهران ، ایران

چکیده

اگرچه مهاربندهای همگرا سختی و مقاومت بالایی دارند، به دلیل کمانش عضو مهاربندی تحت بارهای چرخه‌ای، ظرفیت اتلاف انرژی و شکل پذیری نامطلوبی دارند. یکی از راهکارای مناسب جهت بهبود رفتار مهاربندها استفاده از میراگرهای فولادی است. بنابراین، در این مقاله، یک میراگر حلقه ای فولادی نوین با هدف بهبود عملکرد میراگر حلقه ای معمول معرفی می‌شود. به منظور مطالعه رفتار میراگر پیشنهادی ابتدا صحت سنجی نمونه آزمایشگاهی انجام شد و سپس رفتار هیسترتیک میراگر پیشنهادی با استفاده از نرم افزار آباکوس بررسی شد. نتایج منحنی هیسترزیس نشان می‌‌دهد که میراگر پیشنهادی دارای منحنی هیسترزیس پایدار، متقارن و بدون کاهش ناگهانی سختی و مقاومت هستند. بنابراین می‌توان از آن به عنوان یک عضو شکل پذیر استفاده شود. همچنین در مقایسه با میراگر حلقه ای معمول، اتلاف انرژی و سختی میراگر پیشنهادی به طور میانگین به ترتیب 3.7 و 4.3 برابر بیشتر است. برای غلبه بر مشکلات مهاربندهای همگرا، میراگر پیشنهادی به مهاربند قطری متصل شد. نتایج نشان می‌دهد که میراگر پیشنهادی با داشتن رفتار هیسترتیک پایدار و متقارن موجب بهبود منحنی هیسترزیس مهاربند همگرا شده است و با متمرکز کردن عمده آسیب می‌تواند نقش یک فیوز سازه ای را ایفا کند. در نهایت یک تحلیل تاریخچه زمانی غیرخطی جهت مقایسه قاب مهاربندی همگرا با و بدون میراگر انجام شد. نتایج نشان می‌دهد میراگر پیشنهادی می‌تواند حداکثر برش پایه را به طور میانگین در حدود 94 درصد کاهش دهد. همچنین اضافه کردن میراگر پیشنهادی به قاب مهاربندی همگرا، دریفت برخی طبقات را کاهش می‌دهد.

کلیدواژه‌ها

قاب مهاربندی همگرا؛ میراگر فولادی؛ رفتار هیسترتیک؛ تحلیل چرخه ای

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