مهندسی سازه و ساخت

مهندسی سازه و ساخت

بهبود رفتار اتصال تیر به ستون فولادی پرشده با بتن با تقویت ستون در ناحیه اتصال

نوع مقاله : علمی - پژوهشی

نویسندگان
1 دانشجوی دکتری دانشکدۀ فنی و مهندسی، گروه عمران، واحد تبریز، دانشگاه آزاد اسلامی، تبریز، ایران
2 گروه عمران، دانشکده فنی مهندسی، دانشگاه آزاد اسلامی واحد تبریز، تبریز، ایران مرکز تحقیقات رباتیک و فناوری های نرم، دانشگاه آزاد
3 استادیار دانشکدۀ فنی و مهندسی، گروه عمران، واحد تبریز، دانشگاه آزاد اسلامی، تبریز، ایران
چکیده
استفاده از ستون‌های فولادی پرشده با بتن در ساختمان‌های مرتفع توجه زیادی را به خود جلب کرده است و علت آن مزایای این ستون‌ها نسبت به ستون‌های بتنی و فولادی متعارف می‌باشد. در سال های اخیر جدا از مزایای آن، اتصالات تیر به ستون فولادی پر شده با بتن با چالش‌هایی مهمی همراه است. از جمله این چالش‌ها می‌توان به نحوه انتقال بار از جداره فولادی به بتن، توزیع مناسب تنش، ممانعت از ایجاد تمرکز تنش و خزش بتن اشاره نمود. با توجه به خزش بتن به مرور زمان توزیع نیروها می‌تواند دست‌خوش تغییرات باشد. در پژوهش حاضر نوع جدیدی از اتصال تیر به ستون به منظور بهبود رفتار در ناحیه اتصال مطرح گردیده که با افزایش سطح مقطع ستون در ناحیه اتصال همراه است. در این مقاله به بررسی عددی رفتار اتصال مطرح شده پرداخته شده است. نمونه‌ها در نرم افزار اجزا محدود ABAQUS مدلسازی و از تحلیل استاتیکی غیرخطی استفاده شده است. نمونه‌ها تحت بار چرخه‌ای تحلیل و منحنی های لنگر-دوران استخراج گردیده است. همچنین تاثیر استفاده از مقاطع ارتقاء یافته (UCFT) در ناحیه اتصال نیز بررسی شده است. بررسی‌های عددی حاکی از آن است که اتصال جدید معرفی شده می‌تواند تنش در نواحی انتقال بار از جداره به بتن هسته را کاهش، مقاومت نهایی اتصال را تا 88/14درصد، میزان جذب انرژی تا 34/66 درصد، سختی دورانی تا 94/13درصد و فاصله مفصل پلاستیک از بر ستون را افزایش داده و در مجموع عملکرد اتصال را بهبود بخشد. همچنین استفاده از مقطع ارتقاء یافته نسبت به مقاطع معمولی متداول می‌تواند باعث افزایش مقاومت نهایی اتصال تا 86/8 درصد، میزان جذب انرژی تا 39/37 درصد و سختی دورانی تا 94/7درصد گردد.
کلیدواژه‌ها

موضوعات


عنوان مقاله English

Enhancing Beam-to-Column Connection Behavior in Concrete-Filled Steel Tubes Using Joint Zone Reinforcement

نویسندگان English

Mohammad Ardanloo 1
Adel Ferdousi 2
Seyed Saeed Mirrezaei 3
Mahdi Nouri 2
1 PhD studen, Department of Civil Engineering, Tabriz Branch, Islamic Azad University, Tabriz, Iran
2 Department of Civil Engineering, Faculty of Technical and Engineering, Islamic Azad University, Tabriz Branch, Tabriz, Iran. Robotics & Soft Technologies Research Center, Tabriz Branch, Islamic Azad University, Tabriz, Iran
3 Department of Civil Engineering, Tabriz Branch, Islamic Azad University, Tabriz, Iran
چکیده English

Concrete-filled steel tube (CFT) columns have garnered significant attention in high-rise building construction due to their superior advantages over conventional reinforced concrete or steel columns. However, despite these benefits, beam-to-CFT column connections present critical challenges, including load transfer mechanisms between the steel tube and concrete core, stress distribution efficiency, prevention of stress concentrations, and long-term concrete creep effects, which may alter force redistribution over time. This study proposes a novel beam-to-CFT column connection design aimed at enhancing joint performance by locally enlarging the column cross-section at the connection zone. Numerical investigations were conducted using nonlinear static finite element analysis in ABAQUS, where cyclic loading was applied to extract moment-rotation curves. Additionally, the effects of employing upgraded cross-sections of CFT columns (UCFT) in the connection zone were evaluated. The numerical results demonstrate that the proposed connection system effectively reduces stress concentrations at the steel-concrete interface, while improving key performance metrics: ultimate connection capacity (14.88%), energy absorption (66.34%), rotational stiffness (13.94%), and plastic hinge distance from the column face. Furthermore, UCFT sections outperformed conventional CFT sections, increasing ultimate strength (8.86%), energy dissipation (37.39%), and rotational stiffness (7.94%). These findings highlight the potential of the proposed connection to enhance structural robustness and seismic resilience in CFT-based systems.

کلیدواژه‌ها English

Innovative moment-resisting connection
Energy dissipation capacity
Hysteretic behavior
Concrete-filled steel tubular (CFT) columns
Flexural strength
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  • تاریخ دریافت 09 اسفند 1403
  • تاریخ بازنگری 24 خرداد 1404
  • تاریخ پذیرش 20 تیر 1404