ارزیابی عددی و آزمایشگاهی عملکرد لرزه‌ای اتصال صلب تیر به ستون دایره‌ای با جعبه فولادی

عاکول الهریشات, عبدالرحمن کامل; تحملی  رودسری, مهرزاد; مرادی گروسی, الله رضا; عقابی, محسن

doi:10.22060/ceej.2025.24762.8343

ارزیابی عددی و آزمایشگاهی عملکرد لرزه‌ای اتصال صلب تیر به ستون دایره‌ای با جعبه فولادی

نوع مقاله : مقاله پژوهشی

نویسندگان

عبدالرحمن کامل عاکول الهریشات ¹

مهرزاد تحملی رودسری ¹

الله رضا مرادی گروسی ²

محسن عقابی ¹

¹ دانشکده فنی و مهندسی، گروه مهندسی عمران، واحد کرمانشاه، دانشگاه آزاد اسلامی، کرمانشاه، ایران.

² دانشکده فنی و مهندسی، گروه مهندسی عمران، واحد سنندج، دانشگاه آزاد اسلامی، سنندج، ایران

10.22060/ceej.2025.24762.8343

چکیده

در این مطالعه، رفتار لرزه‌ای اتصال تیر I به ستون دایره‌ای توخالی با استفاده از جعبه فولادی بررسی شد. در گام نخست، سه نمونه آزمایشگاهی با پیکربندی‌های مختلف سخت‌کننده تحت بارگذاری چرخه‌ای شبه‌استاتیکی مورد بررسی قرار گرفتند. نمونه اول با چهار سخت‌کننده داخلی برای انتقال نیرو از جعبه به ستون (مدل مبنا) طراحی شد. نمونه دوم با افزودن دو سخت‌کننده داخلی هم‌راستا با بال‌های تیر و نمونه سوم با سخت‌کننده‌های خارجی در محل اتصال تیر به جعبه همراه با آرایش داخلی مشابه نمونه اول ساخته شدند. پس از اعمال بارگذاری چرخه‌ای، شاخص‌های سختی، لنگر نهایی، شکل‌پذیری و جذب انرژی تجمعی از منحنی‌های لنگر-دوران استخراج شدند. همچنین، دوران چشمه اتصال و حداکثر کرنش در اعضای اصلی هر نمونه اندازه‌گیری گردید. در ادامه، با اتکا به نتایج آزمایشگاهی، مدل المان محدود کالیبره شده برای نمونه‌ دوم (به‌دلیل عملکرد بهتر) توسعه یافت و اثر ضخامت جعبه فولادی در بازه‌ ۴ تا ۱۴ میلی‌متر بر پاسخ‌های مذکور و نیز بر صلبیت اتصال ارزیابی شد. هدف اصلی از مطالعات عددی، تعیین حداقل ضخامتی بود که پس از آن، پاسخ‌ها نسبت به افزایش ضخامت حساسیت ناچیزی داشته باشند. نتایج آزمایشگاهی نشان داد که استفاده از سخت‌کننده‌های داخلی هم‌راستا با بال‌های تیر، عملکرد اتصال را بهبود بخشید و موجب افزایش لنگر نهایی، سختی الاستیک و شکل‌پذیری شد. نتایج عددی حاکی از آن بود که با انتخاب ضخامت جعبه فولادی حداقل 2 میلی‌متر بیشتر از ضخامت بال تیر، پاسخ‌ها نسبت به افزایش ضخامت مستقل می‌شوند و اتصال در رده صلب قرار می‌گیرد.

کلیدواژه‌ها

اتصال صلب

ستون دایره‌ای

جعبه فولادی

سخت‌کننده

عملکرد لرزه‌ای

موضوعات

عنوان مقاله English

Numerical and Experimental Assessment of Seismic Behavior of Rigid I-Beam to Circular Steel-Box Column Connections

نویسندگان English

Abdulrahman Kamil Aakool AL-Hureshat ¹

Mehrzad tahamouliroudsari ¹

AllahReza Moradi Garoosi ²

Mohsen Oghabi ¹

¹ Department of Civil Engineering, Ker.C., Islamic Azad University, Kermanshah, Iran.

² Department of Civil Engineering, San.C., Islamic Azad University, Sanandaj, Iran.

چکیده English

In this study, the seismic behavior of an I-beam to hollow circular column connection with a steel box was investigated. In the first phase, three experimental samples with different stiffener configurations were subjected to quasi-static cyclic loading. The first sample, designed with four internal stiffeners to transfer forces from the box to the column (baseline model), was analyzed. The second sample added two internal stiffeners aligned with the beam flanges, while the third sample incorporated external stiffeners at the beam-to-box connection along with an internal arrangement similar to the first sample. After cyclic loading, stiffness, ultimate moment, ductility, and cumulative energy absorption were extracted from the moment-rotation curves. Additionally, the connection's rotation and maximum strain in the main members of each sample were measured. Based on the experimental results, a calibrated finite element model for the second sample (due to better performance) was developed, and the effect of steel box thickness in the range of 4 to 14 mm on these responses and connection stiffness was assessed. The main objective of the numerical studies was to determine the minimum thickness beyond which responses became insensitive to further increases in thickness. Experimental results showed that the use of internal stiffeners aligned with the beam flanges improved the connection's performance, increasing the ultimate moment, elastic stiffness, and ductility. Numerical results indicated that with a steel box thickness at least 2 mm greater than the beam flange thickness, the responses became independent of further thickness increases, and the connection was classified as rigid.

کلیدواژه‌ها English

Rigid Connection

Circular Column

Steel Box

Stiffener

Seismic Performance

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