مهندسی سازه و ساخت

مهندسی سازه و ساخت

مطالعات عددی و آزمایشگاهی عملکرد لرزه‌ای اتصال تیر به ستون دایره‌ای پر شده با بتن با استفاده از جعبه فولادی

نوع مقاله : علمی - پژوهشی

نویسندگان
1 دانشجوی دکتری، دانشکده فنی و مهندسی، گروه مهندسی عمران، واحد کرمانشاه، دانشگاه آزاد اسلامی، کرمانشاه، ایران
2 دانشیار، دانشکده فنی و مهندسی، گروه مهندسی عمران، واحد کرمانشاه، دانشگاه آزاد اسلامی، کرمانشاه، ایران
3 استادیار، دانشکده فنی و مهندسی، گروه مهندسی عمران، واحد سنندج، دانشگاه آزاد اسلامی، سنندج، ایران
چکیده
در این پژوهش، جزئیات یک اتصال جدید بر پایه جعبه فولادی و آرایش بهینه‌شده سخت‌کننده‌های داخلی و خارجی ارائه شد. این پیکربندی با ایجاد مسیرهای مناسب برای انتقال نیرو و بهبود توزیع تنش، عملکرد خمشی و برشی اتصال را ارتقا می‌دهد و در عین حال، نیاز به ورق‌های پیوستگی و مضاعف را حذف کرده و فرآیند ساخت را ساده‌تر می‌سازد. در گام نخست، سه نمونه با عملکرد برتر بر پایه تحلیل‌های عددی اولیه انتخاب و تحت بارگذاری چرخه‌ای آزمایشگاهی ارزیابی شدند. خروجی‌های این مرحله شامل سختی الاستیک، لنگر نهایی، ظرفیت جذب انرژی، دوران چشمه اتصال و کرنش در اجزای اصلی بود. بر اساس نتایج آزمایشگاهی، بهترین نمونه شناسایی شد و پس از صحت‌سنجی مدل عددی بر مبنای آن، مطالعات پارامتریک برای بررسی اثر ضخامت جعبه فولادی بر رفتار اتصال انجام شد. هدف این بخش، تحلیل حساسیت نتایج نسبت به تغییر ضخامت جعبه فولادی و ارزیابی نقش آن در ارتقای صلبیت اتصال بود. نتایج آزمایشگاهی نشان داد که مدل دارای سخت‌کننده‌های داخلی هم‌راستا با بال تیر، سختی و مقاومت را به‌ترتیب ۹ و 2/5 برابر نسبت به مدل مبنا افزایش داد. همچنین افزودن سخت‌کننده‌های خارجی، لنگر نهایی و سختی را به‌ترتیب 8/3 و 2/6 برابر مدل مبنا بهبود بخشید. علاوه بر این، نتایج عددی حاکی از آن است که با انتخاب ضخامت جعبه فولادی حداقل ۲ میلی‌متر بیشتر از ضخامت بال تیر، مقاومت و سختی اتصال به وضعیت پایدار رسیده و افزایش بیشتر ضخامت اثر ناچیزی بر نتایج دارد. همچنین نتایج عددی نشان داد که در محدوده ضخامت‌های بزرگ‌تر یا مساوی ۸ میلی‌متر، اتصال به شکل‌پذیری ۴/۷ رسیده و نسبت میرایی معادل آن تا حدود ۴۰ درصد افزایش می‌یابد.
کلیدواژه‌ها
موضوعات

عنوان مقاله English

Numerical and Experimental Investigation of the Seismic Performance of Beam-to-Circular CFST Column Connections Using a Steel Box

نویسندگان English

Ary Shehab Jamil 1
Mehrzad TahamouliRoudsari 2
AllahReza Moradi Garoosi 3
Javad Esfandiari 2
1 Ph.D. StudentDepartment of Civil Engineering, Ker.C., Islamic Azad University, Kermanshah, Iran
2 Associate Professor, Department of Civil Engineering, Ker.C., Islamic Azad University, Kermanshah, Iran
3 Assistant professor, Department of Civil Engineering, Sa.C., Islamic Azad University, Sanandaj, Iran
چکیده English

In this study, the details of a new connection based on a steel box and an optimized arrangement of internal and external stiffeners were presented. This configuration enhances the flexural and shear performance of the connection by providing appropriate force-transfer paths and improving stress distribution, while eliminating the need for continuity and doubler plates and simplifying the fabrication process. In the first step, three superior specimens were selected based on preliminary numerical analyses and evaluated under laboratory cyclic loading. The outputs included elastic stiffness, ultimate moment, energy dissipation capacity, panel-zone rotation, and strain in the main components. Based on the experimental results, the best specimen was identified, and after validating the numerical model accordingly, a parametric study was conducted to examine the effect of the steel-box thickness on the connection behavior. The objective was to analyze the sensitivity of the results to variations in the box thickness and assess its role in improving connection rigidity. Experimental results showed that the model equipped with internal stiffeners aligned with the beam flange increased stiffness and strength by factors of 9 and 5.2, respectively, compared with the baseline model. Moreover, adding external stiffeners improved the ultimate moment and stiffness by factors of 3.8 and 6.2, respectively. Numerical results indicated that when the steel-box thickness is selected at least 2 mm greater than the beam-flange thickness, the strength and stiffness reach a stable condition, and further increases in thickness have negligible effects. Numerical findings also showed that for thicknesses greater than or equal to 8 mm, the connection achieves ductility of about 7.4, and its equivalent damping ratio increases by up to 40%.

کلیدواژه‌ها English

Circular column
Rigid connection
Experimental study
External stiffener
Steel box
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  • تاریخ دریافت 25 شهریور 1404
  • تاریخ بازنگری 07 آذر 1404
  • تاریخ پذیرش 07 دی 1404