نشریه علمی سازه و فولاد

نشریه علمی سازه و فولاد

ارزیابی عملکرد لرزه‌ای قاب‌های ترکیبی فولادی خمشی و مهاربندی واگرا با اتصالات مرکزگرای پس‌کشیده

نوع مقاله : مقاله پژوهشی

نویسندگان
1 دانشگاه آزاد اسلامی
2 دانشیار گروه سازه، مهندسی عمران، دانشگاه صنعتی خواجه نصیرالدین طوسی، تهران
چکیده
قاب‌های خمشی فولادی ویژه به‌دلیل شکل‌پذیری مناسب، کاربرد گسترده‌ای در سازه‌های مقاوم در برابر زلزله دارند؛ اما پس از زلزله‌های شدید، معمولاً دچار جابه‌جایی پسماند زیادی می‌شوند. در مقابل، سیستم‌های مرکزگرای پس‌کشیده که با استفاده از کابل‌های فولادی پیش‌تنیده طراحی می‌شوند، با ایجاد نیروی بازگرداننده، توانایی بازگرداندن سازه به حالت اولیه را دارند. بااین‌حال، این سیستم‌ها به‌دلیل رفتار ارتجاعی اجزا، ظرفیت اتلاف انرژی پایینی دارند و ممکن است در برابر زلزله‌های شدید، دریفت‌های قابل‌توجهی تجربه کنند.
در این پژوهش، برای بهره‌گیری از مزایای دو سیستم سازه‌ای، چند پیکربندی ترکیبی به‌صورت عددی بررسی شده‌اند. این پیکربندی‌ها شامل قاب خمشی ویژه، قاب مهاربندی واگرا و قاب مرکزگرای پس‌کشیده هستند. 12 مدل قاب فولادی سه‌ دهانه و یک‌طبقه با استفاده از نرم‌افزار آباکوس تحت بارگذاری چرخه‌ای تحلیل شدند. نوآوری پژوهش در طراحی یک سیستم ترکیبی جدید با عملکرد لرزه‌ای متعادل، سختی جانبی مطلوب و کاهش جابه‌جایی پسماند است.
نتایج نشان داد ترکیب قاب خمشی با سیستم مرکزگرا، جابه‌جایی پسماند را تا حدود 35% کاهش می‌دهد. همچنین، کاهش نیروی پیش‌تنیدگی کابل‌ها، موجب افزایش 5/2 برابری نسبت میرایی معادل شد. ترکیب قاب مهاربندی واگرا با قاب مرکزگرا نیز نسبت میرایی معادل را تا 6% در دریفت 2% افزایش داد.
کلیدواژه‌ها

عنوان مقاله English

Seismic Performance Evaluation of Steel Moment and Eccentrically Braced Hybrid Frames with Post-Tensioned Self-Centering Connections

نویسندگان English

Farshad Bahri 1
Shahriar Tavousi 1
Nader Fanaie 2
1 Islamic Azad University, Central Tehran Branch
2 Associate Professor at the Faculty of Civil Engineering, K. N. Toosi University of Technology
چکیده English

Special Moment-Resisting Frames (SMRFs) are widely adopted in seismic-resistant steel structures due to their notable ductility. However, they often exhibit significant residual drifts following major earthquakes, which can compromise the structural serviceability and increase repair costs. On the other hand, Post-Tensioned Self-Centering (PTSC) systems, designed using prestressed steel tendons, generate restoring forces that enable the structure to return to its original configuration. Despite this advantage, PTSC systems typically show low energy dissipation capacity and may experience considerable drifts under strong ground motions due to their elastic behavior.
To leverage the strengths of both systems, this study investigates several hybrid configurations combining SMRFs, PTSC frames, and Eccentrically Braced Frames (EBFs). Twelve one-story, three-bay steel frames were modeled and analyzed under cyclic loading using Abaqus finite element software. The novelty of the research lies in proposing a hybrid system that achieves balanced seismic performance, enhanced lateral stiffness, and reduced residual drift.
Results indicate that integrating SMRFs with PTSC systems can reduce residual drift by up to 35%. Moreover, reducing the post-tensioning force of tendons led to a 2.5-fold increase in the equivalent damping ratio. Combining EBFs with PTSC frames further increased the damping ratio up to 6% at 2% drift levels.

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