نشریه علمی سازه و فولاد

نشریه علمی سازه و فولاد

مدل‌سازی مکانیکی و تحلیل اجزای محدود میراگر فولادی U-ADAS

نوع مقاله : مقاله پژوهشی

نویسندگان
دانشکدگان فنی دانشگاه تهران، تهران، ایران
چکیده
در این مقاله یک میراگر فولادی جدید با هندسۀ Uشکل و بُعد عمود بر صفحۀ متغیر (U-ADAS) برای بهبود توزیع تسلیم در طول عضو معرفی شده است. با استفاده از یک مدل مکانیکی ساده‌شده، روابط بسته‌ای برای نیروی تسلیم، جابه‌جایی تسلیم و سختی اولیه بر حسب هندسه و خواص مصالح استخراج شده است. رفتار مصالح فولادی در چارچوب یک مدل سخت‌شوندگی ترکیبی و بر اساس نتایج آزمایشگاهی موجود به‌طور عددی کالیبره شده و سپس در شبیه‌سازی‌های اجزای محدود به‌کار گرفته شده است. میراگرهای U-ADAS و Uشکل در نرم‌افزار آباکوس تحت پروتکل بارگذاری FEMA 461 مدل‌سازی و تحلیل شده‌اند. نتایج نشان می‌دهد اختلاف بین مقادیر تحلیلی و عددی جابه‌جایی تسلیم، نیروی تسلیم و سختی اولیه به‌ترتیب حدود ۴، ۹ و ۴ درصد است؛ که دقت مدل مکانیکی پیشنهادی را تأیید می‌کند. مقایسۀ منحنی‌های هیسترزیس، توزیع کرنش پلاستیک و انرژی اتلافی نشان می‌دهد میراگر U-ADAS با وجود کاهش حدود ۳۰ درصدی جرم، انرژی تجمعی مستهلک حدود ۱۱ درصد بیش‌تر، نسبت به میراگر Uشکل مستهلک کرده و خرابی آن در دامنه‌های جابه‌جایی بزرگ‌تر رخ می‌دهد. این نتایج کارایی لرزه‌ای بالاتر و پتانسیل استفادۀ میراگر U-ADAS را به‌عنوان گزینه‌ای سبک‌وزن و بهینه در سیستم‌های کنترل غیرفعال سازه‌ای نشان می‌دهد.
کلیدواژه‌ها

موضوعات


عنوان مقاله English

Mechanical modeling and finite element analysis of a U-ADAS steel damper

نویسندگان English

Mohammadreza Alimardani
Abazar Asghari
Department of Civil Engineering, University of Tehran, Tehran, Iran
چکیده English

This paper introduces a new steel energy dissipation device with U-shaped geometry and variable in-plane width (U-ADAS), aimed at improving the uniformity of yielding along the member. Using a simplified mechanical model, closed-form expressions are derived for the yield force, yield displacement and initial stiffness as functions of geometry and material properties. The cyclic behavior of the steel is numerically calibrated within a combined hardening framework based on available experimental data and then implemented in the finite element simulations. U-ADAS and conventional U-shaped dampers are modeled and analyzed in ABAQUS under the FEMA 461 loading protocol. The results show that the differences between analytical and numerical values of yield displacement, yield force and initial stiffness are approximately 4%, 9% and 4%, respectively, confirming the accuracy of the proposed mechanical model. Comparison of hysteresis curves, plastic strain distribution and dissipated energy indicates that the U-ADAS damper, despite having about 30% less mass, dissipates roughly 11% more cumulative energy than the U-shaped damper and fails at larger displacement amplitudes. These findings demonstrate the superior seismic performance and the potential application of the U-ADAS damper as a lightweight option in passive structural control systems.

کلیدواژه‌ها English

Steel U-ADAS damper
U-shaped damper
uniform yielding distribution
finite element modeling
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  • تاریخ دریافت 28 آبان 1404
  • تاریخ بازنگری 29 آبان 1404
  • تاریخ پذیرش 30 آبان 1404
  • تاریخ اولین انتشار 30 آبان 1404
  • تاریخ انتشار 01 مهر 1404