ارزیابی عملکرد میراگر لوله‌ای بیضوی قائم بر بهبود رفتار قاب‌های فولادی مهاربندی شورون

خطیبی نیا, محسن; حسنی, صفرخان; بیجاری, شیما; رستمی, سبحان

doi:10.48301/kssa.2024.460247.2922

ارزیابی عملکرد میراگر لوله‌ای بیضوی قائم بر بهبود رفتار قاب‌های فولادی مهاربندی شورون

نوع مقاله : مقاله پژوهشی (نظری)

نویسندگان

محسن خطیبی نیا ¹

صفرخان حسنی ²

شیما بیجاری ³

سبحان رستمی ⁴

¹ دانشیار، گروه مهندسی عمران، دانشکده مهندسی، دانشگاه بیرجند، بیرجند، ایران.

² دانشجوی کارشناسی ارشد، گروه مهندسی عمران، دانشکده مهندسی، دانشگاه بیرجند، بیرجند، ایران.

³ استادیار، گروه مهندسی عمران، دانشکده مهندسی، دانشگاه بیرجند، بیرجند، ایران.

⁴ استادیار، گروه مهندسی عمران، دانشگاه ملی مهارت، تهران، ایران.

10.48301/kssa.2024.460247.2922

چکیده

کمانش بادبندها در سیستم مهاربندی همگرا ضعفی‌ عمده در هنگام وقوع زلزله‌ها می‌باشد. یکی از راهکارهای پیشنهادی برای غلبه بر این ضعف، استفاده از میراگرهای فلزی تسلیم‌شونده در محل اتصال بادبند به تیر طبقه است به‌طوری‌که انرژی ورودی ناشی از تحریک‌های لرزه‌ای توسط میراگرهای تسلیم‌شونده مستهلک می‌شود و اعضای اصلی این سیستم (تیر، ستون و مهاربند) در حالت کشسان باقی می‌ماند. علاوه بر این، ساخت، نصب و تعمیر میراگرهای لوله‌ای شکل پس از زلزله بسیار آسان و کم‌هزینه است. در این تحقیق، عملکرد میراگر لوله‌ای بیضوی قائم در قاب ‌مهاربندی‌شده شورون به‌منظور استهلاک انرژی ورودی تحت بارگذاری چرخه‌ای و جلوگیری از کمانش بادبندها بررسی شده است و عملکرد آن با میراگر لوله‌ای با سطح مقطع دایره‌ای مقایسه شده است. ابتدا، اعتبار‌سنجی مدل‌سازی نمونه میراگر لوله‌ای در قاب مهاربندی‌شده شورون در نرم‌افزار اجزای محدود آباکوس انجام شده است. در ادامه، 5 نمونه میراگر لوله‌ای بیضوی با وزن برابر با نمونه‌های میراگر لوله‌ای دایره‌ای انتخاب شده است و مقایسه عملکرد این نمونه میراگرها در قاب مهاربندی شورون تحت پروتکل بارگذاری چرخه‌ای ‌مطالعه شده است. نتایج نشان می‌دهد که میراگرهای لوله‌ای بیضوی شکل‌پذیری و استهلاک انرژی بیشتری نسبت به میراگرهای لوله‌ای دایره‌ای دارند. نتایج حاکی از افزایش شکل‌پذیری قاب‌های مجهزشده به میراگرهای لوله‌ای بیضوی نسبت به میراگر لوله‌ای بین 6 تا 69 درصد است. همچنین، از مقایسه انرژی مستهلک‌شده مشاهده می‌شود که میراگرهای لوله‌ای بیضوی نسبت به میراگرهای لوله‌ای دایره‌ای، باعث افزایش 6 تا 22 درصدی می‌شود.

کلیدواژه‌ها

قاب‌های فولادی

مهاربند شورون

میراگرهای تسلیمشونده

میراگر لوله‌ای بیضوی قائم

شکل‌پذیری

استهلاک انرژی

موضوعات

مهندسی عمران(سازه و زلزله )

عنوان مقاله English

Performance Evaluation of Vertical Elliptical Tubular Damper on Improving the Behaviour of Chevron-braced Steel Frames

نویسندگان English

Mohsen Khatibinia ¹

Safarkhan Hassani ²

Shima Bijari ³

Sobhan Rostami ⁴

¹ Associate Professor, Department of Civil Engineering, Engineering Faculty, University of Birjand, Birjand, Iran.

² MSc Student, Department of Civil Engineering, Engineering Faculty, University of Birjand, Birjand, Iran.

³ Assistant Professor, Department of Civil Engineering, Engineering Faculty, University of Birjand, Birjand, Iran.

⁴ Assistant Professor, Department of Civil Engineering, National University of Skills (NUS), Tehran, Iran.

چکیده English

The buckling of braces in an eccentrically braced system is a major weakness during earthquakes. To overcome this weakness, one of the proposed solutions is the use of metallic yielding dampers at the connection of the brace to the flange beam of the story so that the input energy caused by seismic excitations is dissipated by dampers and the main members of this system (beams, columns, and braces) remain in an elastic state. In addition, construction, installation, and repair of tubular dampers after an earthquake excitation is very easy and low-cost. In this study, the performance of the vertical elliptical tubular damper (VETD) in the chevron braced frame was investigated to dissipate the input energy under cyclic loading and prevent the buckling of braces, and its performance was compared with a vertical tubular damper (VTD) with a circular cross-section. First, the validation of modeling VTD in the chevron-braced frame was implemented in Abaqus finite element software. Then, five VETD samples with the same weight as the VTD samples were selected, and the performance comparison of the sample dampers in the chevron-braced frame under the cyclic loading protocol was studied. The results showed that VETDs have more ductility and energy dissipation than VTDs. The results indicated a 6 to 69% increment in the ductility of frames equipped with VETDs compared to that of VTDs. Furthermore, the comparison of the depreciated energy of dampers indicated that VETDs increased by 6 to 22% in comparison with VTDs.

کلیدواژه‌ها English

Steel Frames

Chevron Bracing

Metallic Yielding Dampers

Vertical Elliptical Tubular Damper

Ductility

Depreciated Energy

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