ارزیابی تأثیر میراگر جرمی تنظیم شونده بر عملکرد لرزه‌ای سازه فولادی جداسازی شده ا استفاده از تحلیل زمان دوام

مهندسی عمران فردوسی

مقاله 3، دوره 36، شماره 2 - شماره پیاپی 42، تیر 1402، صفحه 41-60   

نوع مقاله: مقاله پژوهشی

شناسه دیجیتال (DOI): 10.22067/jfcei.2023.80516.1208

نویسندگان

میلاد زربیلی نژاد؛ امین قلی زاد^*

گروه مهندسی عمران، دانشکده فنی ومهندسی، دانشگاه محقق اردبیلی، اردبیل، ایران

چکیده

جداسازها و میراگرها، ابزارهای اتلاف انرژی برای کنترل و کاهش پاسخ‌های لرزه‌ای سازه‌ها تحت زمین‌لرزه‌های شدید محسوب می‌شوند. جداساز هسته سربی (LRB) و میراگر جرمی تنظیم شونده (TMD) دو نمونه از متداولترین این ابزارها هستند. مطالعه‌ رفتار غیرخطی و خواص لرزه‌ای سیستم‌های سازه‌ای مجهز به این نوع جداسازها و میراگرها می‌تواند کمک قابل‌توجهی به درک رفتار این سیستم‌ها در برابر نیروهای جانبی ناشی از زمین‌لرزه‌های بزرگ نماید. در این پژوهش سازه فولادی 9 طبقه طراحی شده، با استفاده از روش زمان دوام در حالت‌های با پایه ثابت و جداسازی شده به همراه میراگر با نسبت‌های جرمی مختلف و بدون میراگر جرمی در نرم‌افزار SAP2000 تحلیل شده است. نتایج تحلیل‌های انجام‌گرفته نشان می‌دهد که وجود میراگر جرمی تنظیم شونده در کاهش میزان جابه‌جایی تراز جداساز، نسبت جابه‌جایی نسبی و نیروی برش طبقات بسیار مؤثر هست که با افزایش نسبت جرمی میراگر، این اثر بیشتر می‌گردد. ولی در کاهش پاسخ شتاب مطلق سازه مؤثر نبوده و با افزایش نسبت جرمی میراگر جرمی از کارایی سامانه­ کنترلی در بهبود پاسخ شتاب نسبت به حالت جداساز تنها کاسته می‌شود.

کلیدواژه‌ها

جداساز لاستیکی هسته سربی؛ میراگر جرمی تنظیم شونده؛ تحلیل زمان دوام؛ سازه فولادی

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