ارتقای رفتار چرخه‌ای مفصل مکانیکی اتصال تیر به ستون در قاب‌های خمشی فولادی با ستون‌های CFT با استفاده از سیستم نوین بازگرداننده متشکل از فنر و هدایتگر

نوع مقاله : مقاله کامل پژوهشی

نویسندگان

1 گروه مهندسی عمران، واحد مراغه، دانشگاه آزاد اسلامی، مراغه

2 دانشکده مهندسی عمران، دانشگاه تبریز

10.22034/ceej.2026.70268.2472

چکیده

در هر سیستم سازه‌ای، گسیختگی اتصالات ترد و نامطلوب است. براین‌اساس، در آیین‌نامه‌های طراحی لرزه‌ای، اتصالات اعضای نیرو- کنترل قلمداد می‌شوند و همواره سعی بر آن است تا با درنظرگرفتن خرابی‌های کنترل شده در سیستم و تعبیه فیوزهای لرزه‌بر، از ورود آن‌ها به محدوده رفتار غیرخطی ممانعت شود. در قاب‌های خمشی با ستون‌های پرشده با بتن (CFT)، معمولاً فیوزهای لرزه‌بر در دو انتهای تیرهای اصلی تعبیه می‌شوند، اما این راهکار خطر آسیب‌پذیری بالای اتصالات و دشواری تعمیر یا جایگزینی تیرها به‌عنوان اعضای اصلی باربر را به‌همراه دارد. در این راستا، استفاده از مفاصل مکانیکی مجهز به سیستم بازگرداننده می‌تواند با تمرکز فیوزهای لرزه‌بر در نواحی دور از اتصالات، چالش‌های فوق را کاهش دهد. در مطالعه حاضر یک سیستم برگشت‌پذیر ویژه معرفی و جزئیات تحلیل و طراحی آن ارائه شده و عملکرد لرزه‌ای آن در قاب‌های خمشی با ستون‌های CFT ارزیابی گردیده است. فرآیند تحلیل با مدل‌سازی عددی سه اتصال شامل: اتصال خمشی سخت‌شده، اتصال مفصلی مکانیکی بدون سیستم بازگرداننده و اتصال مفصلی مکانیکی مجهز به فنر بازگرداننده، گایدر (Guider) و سخت‌کننده انجام شد. نتایج نشان داد سیستم پیشنهاد شده دارای منحنی‌های چرخه‌ای پهن و پایدار با ظرفیت بالای جذب و استهلاک انرژی است. همچنین استهلاک انرژی و تقاضای شکل‌پذیری ستون‌ها به‌ترتیب حدود ۳۳% و ۴۱٫۷% کاهش یافت این کاهش بیانگر آن است که سیستم بازگرداننده موجب محدود شدن تغییرشکل‌های پلاستیک سازه شده است.

کلیدواژه‌ها

موضوعات


عنوان مقاله [English]

Enhancing the Cyclic Behavior of a Mechanical Beam-To-Column Joint in Steel Moment-Resisting Frames with CFT Columns Using a Novel Spring-Guide Restoring System

نویسندگان [English]

  • Hamid Ghaderi 1
  • Ahmad Maleki 1
  • Mohammad Ali Lotfollahi-Yaghin 2
1 Faculty Department of Civil Engineering, Mar. C., Islamic Azad University, Maragheh, Iran
2 Faculty Civil Engineering, University of Tabriz, Tabriz, Iran
چکیده [English]

The concept of using Concrete-Filled Steel Tube (CFT) columns has been proposed to optimize the use of steel and concrete materials. The advantages of these elements have led to their widespread application in the construction industry. These types of columns are usually used in moment resisting frame systems with rigid connections, and play a significant role in lateral load resistance of the system. Despite providing sufficient strength for beams and columns, weakness in the connection area can disrupt the load path and could lead to overall collapse of the system. When the connection is well-designed, seismic fuses will concentrate at both ends of the beam (the main frame member). After a strong earthquake, the entire story beam needs repair or replacement, which incurs high costs. To address all these challenges, this study proposes using a mechanical joint equipped with a centering spring.

کلیدواژه‌ها [English]

  • CFT column
  • Mechanical joint
  • Seismic fuse
  • Cyclic analysis
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