نشریه علمی سازه و فولاد

نشریه علمی سازه و فولاد

مقایسه عملکرد لرزه ای قاب‌های خمشی فولادی 14طبقه با میراگر‌های جرمی تنظیم‌شده منفرد و چندگانه با توزیع بر اساس اشکال مودی تحت تحلیل دینامیکی فزاینده

نوع مقاله : مقاله پژوهشی

نویسندگان
1 عمران، دانشکده مهندسی عمران، دانشگاه تهران، تهران، ایران
2 دانشکده عمران، دانشگاه تهران، تهران، ایران
چکیده
زمینۀ پژوهش: افزایش ایمنی لرزه‌ای و کاهش خسارات سازه‌های بلندمرتبه از اهداف اصلی مهندسی زلزله است. این پژوهش به بررسی عملکرد لرزه‌ای میراگرهای جرمی تنظیم‌شدۀ منفرد و چندگانه در یک قاب خمشی فولادی ۱۴ طبقه می‌پردازد. هدف، مقایسۀ کارایی این دو آرایش در کاهش پاسخ دینامیکی سازه و ارزیابی تأثیر توزیع ارتفاعی میراگرهای چندگانه بر اساس شاخص انرژی مودال است.
روش پژوهش: یک قاب خمشی فولادی ۱۴ طبقه در حالات مختلف در محیط Opensees مدل‌سازی و تحت تحلیل دینامیکی فزاینده با ۱۴ رکورد زلزله (۷ رکورد دور از گسل و ۷ رکورد نزدیک گسل پالس‌دار) بررسی شده است. هفت مدل شامل سازۀ بدون میراگر، سه مدل با میراگر منفرد و سه مدل با میراگر چندگانه با نسبت‌های جرمی ۱، ۳ و ۵ درصد تحلیل شدند. پاسخ‌ها از نظر جابه‎جایی بام، دریفت بین‌طبقه‌ای، برش پایه و منحنی‌های شکنندگی مقایسه شدند.
یافته‌ها: نتایج نشان داد هر دو سیستم، عملکرد سازه را بهبود می‌بخشند؛ اما میراگر چندگانه در اغلب شاخص‌ها برتر از منفرد بود. بیش‎ترین شدت طیفی میانۀ شتاب در مدل با نسبت جرم ۵ درصد، مقدار 492/4 (4/77% افزایش نسبت به حالت بدون میراگر) بود. همچنین، کاهش جابه‎جایی بام در مدل‌های دارای میراگر چندگانه (به‌ویژه در نسبت‌های ۱ و ۳ درصد) بیش‎تر از منفرد بود. منحنی‌های شکنندگی نیز نشان دادند میراگر چندگانه احتمال فراگذشت از سطوح خرابی را کاهش می‌دهد.
نتیجه‌گیری: استفاده از میراگر چندگانه با توزیع ارتفاعی مبتنی بر انرژی مودال، راهکاری مؤثرتر از میراگر منفرد برای بهبود عملکرد لرزه‌ای سازه‌های بلندمرتبه است.
کلیدواژه‌ها
موضوعات

عنوان مقاله English

Comparative Seismic Performance of 14-Story Steel Moment-Resisting Frames Equipped with Single and Multiple Tuned Mass Dampers Distributed Based on Mode Shapes under Incremental Dynamic Analysis

نویسندگان English

Mohammad Rouhani 1
Mehdi Zahrai 2
1 Civil engineeing faculty, University of Tehran, Tehran, Iran.
2 Civil egineering department, University of Tehran, Tehran, Iran
چکیده English

Background: Improving the seismic performance of high-rise structures and reducing earthquake-induced damage are major concerns in earthquake engineering. This study investigates the seismic performance of single tuned mass dampers (STMDs) and multiple tuned mass dampers (MTMDs) in a 14-story steel moment frame. The objective is to compare the efficiency of these systems in enhancing seismic capacity, reducing structural response, and evaluating the effect of height-wise distribution based on the modal energy index.
Methods: A 14-story steel frame was modeled in different cases in OpenSees and evaluated using Incremental Dynamic Analysis (IDA). Fourteen ground motion records, including 7 far-fault and 7 pulse-like near-fault records, were used. Seven models were analyzed: one uncontrolled structure, three STMD models with mass ratios of 1%, 3%, and 5%, and three MTMD models with the same mass ratios. Structural responses were assessed in terms of roof displacement, interstory drift ratio, base shear, IDA curves, and fragility curves.
Results: Both damping systems improved seismic performance compared to the uncontrolled structure; however, MTMDs generally performed better than STMDs in most indices. The highest median collapse intensity was obtained for the MTMD model with a 5% mass ratio, reaching 4.492, a 77.37% increase over the uncontrolled structure. MTMDs with 1% and 3% mass ratios also reduced roof displacement more effectively. Fragility analysis showed that MTMDs significantly decreased the probability of exceedance.
Conclusion: MTMDs distributed along the height based on the modal energy index are more effective than a single rooftop damper in improving seismic performance and reducing failure probability of high-rise steel structures

کلیدواژه‌ها English

Tuned Mass Damper
Passive Control
Multiple Tuned Mass Damper
Fragility Curves
Incremental Dynamic Analysis
Steel Moment Frame
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  • تاریخ دریافت 17 مهر 1404
  • تاریخ بازنگری 03 اسفند 1404
  • تاریخ پذیرش 11 اسفند 1404
  • تاریخ اولین انتشار 15 فروردین 1405
  • تاریخ انتشار 15 فروردین 1405