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

نوع مقاله : مقاله پژوهشی

نویسندگان

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

عنوان مقاله [English]

Assessment of the effect of the tuned mass damper on the seismic performance of isolated steel structures by using endurance time analysis

نویسندگان [English]

  • Milad Zarbilinezhad
  • Amin Gholizad
Department of Civil Engineering, Technical and Engineering Faculty, Mohaghegh Ardabili University, Ardabil, Iran
چکیده [English]

Isolators and dampers are devices that dissipate energy and reduce the seismic response of structures during strong earthquakes. Lead Rubber Bearings (LRBs) and Tuned Mass Dampers (TMDs) are two common types of these devices. Studying non-linear behavior and seismic properties of structural systems equipped with this type of isolators and dampers can significantly enhance understanding of their behavior against lateral forces caused by strong earthquakes. In this study, a 9-story steel structure was analyzed using the Endurance Time Analysis (ETA) method in SAP2000 software with fixed and isolated bases, along with a tuned mass damper with different mass ratios and without a tuned mass damper. The analysis results indicate that the tuned mass damper is highly effective in reducing the displacement of the isolator level, drift ratio, and story shear forces. This effect is more significant with higher mass ratios of the TMD. This effect is more pronounced with higher mass ratios of the TMD. However, reducing the absolute acceleration response of the structure has not been effective, and increasing the mass ratio of the TMD only reduces the performance of the control system in improving the absolute acceleration response compared to the isolated state.

کلیدواژه‌ها [English]

  • Lead Rubber Bearing
  • Tuned Mass Damper
  • Endurance Time Analysis
  • Steel structure

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