بررسی تحلیلی عملکرد لرزه‌ای مهاربند کمانش تاب با طول کوتاه دارای هسته S شکل

نوع مقاله : مقاله پژوهشی

نویسندگان

1 دانشکده مهندسی عمران، دانشگاه صنعتی شاهرود

2 استادیار، دانشکده مهندسی عمران، دانشگاه صنعتی شاهرود، سمنان، شاهرود، ایران

چکیده

استفاده از مهاربندهای فولادی در ساختمان‌های با سیستم لرزه­بر قاب­خمشی می­تواند به طور قابل ملاحظه­ای تغییر مکان جانبی این سیستم را کنترل کند. یکی از ایرادهای سیستم مهاربندی متداول، کمانش آن‌ها در بارهای فشاری است که میزان استهلاک انرژی سازه را کاهش می­دهد. مهاربندهای کمانش­تاب (BRBs ) با حذف کمانش کلی مهاربند در فشار ایراد مهاربندهای متداول را برطرف کرده است اما مواردی از قبیل وزن بیش از حد، قیمت بالا و اجرای سخت آن‌ها منجر به معرفی نوع جدیدی از مهاربندهای کمانش­تاب با نام مهاربند کمانش­تاب طول کوتاه RLBRBگردیده است. با این وجود در مهاربندهای RLBRBبه دلیل حاکم شدن پدیده خستگی کم سیکلی نمی­توان طول مهاربند را بیش از حد کاهش داد تا بتوان به عنوان یک سیستم غیر فعال بعد از زلزله قابلیت تعویض داشته باشد. در این تحقیق یک ایده جدید و نوآورانه به نام مهاربند کمانش­تاب طول کوتاه با هسته Sشکل معرفی می گردد که علی رغم طول بسیار کوتاه می‌تواند عملکردی مشابه سیستم RLBRB و BRBداشته باشد و در عین حال به عنوان یک سیستم کنترل غیر فعال عمل کند. لذا ابتدا مدل‌های تحلیلی مهاربندهای RLBRBو BRBsرا در نرم افزار اجزا محدود ABAQUSبر اساس نتایج آزمایشگاهی محققین گذشته صحت سنجی می‌کنیم. سپس طبق نتایج حاصل از تحلیل، مشخصات مهاربند کمانش تاب طول کوتاه با هسته Sشکل با مهاربندهای RLBRBو BRBمقایسه می‌گردد. نتایج حاصل از مقایسه طرح پیشنهادی با مهاربندهای کمانش تاب متداول بیانگر این است که علی رغم کوچک‌تر و سبک‌تر بودن این مهاربندها رفتاری مشابه مهاربندهای BRBمتداول دارند.

کلیدواژه‌ها

موضوعات


عنوان مقاله [English]

An Analytical Study of Seismic Performance of a New Type of Reduced Length Buckling Restrained Brace (RLBRB) with S-shaped Core

نویسندگان [English]

  • Reza Tahmasebi 1
  • Jalil Shafaei 2
1 Faculty of Civil Engineering, Shahrood University of Technology
2 Faculty of Civil engineering, Shahrood University of Technology, Shahrood, Semnan, Iran
چکیده [English]

The use of steel braces in buildings with a system of seismicity in the moment frame can significantly control the lateral displacement of the structure. One of the problems with the conventional bracing system is their buckling in compressive loads, which reduces the amount of energy absorbed by the structure. The buckling restrained braces (BRBs) have been removed by the removal of buckling bracing at the pressure of common bracing, but such cases as overweight, high prices and rigorous implementations have led to the introduction of a new type of buckling brace called Reduced Length Buckling Restrained Brace (RLBRB). However, in RLBRB, due to the low cyclic fatigue phenomenon, the length of bracing can‍‍not be over-reduced so that it can be replaced as an inactive system after an earthquake. In this research, a new and innovative idea called Reduced Length Buckling Restrained Brace with S-shaped Core is introduced, which, despite its very short length, can overcome all the problems with the RLBRB and BRB system while also serving as a passive control system. Therefore, the analytical model in the ABAQUS finite element software was validated with the experimental results of RLBRB and BRBs of previous research work. Then, according to the results of the analysis, the profile of the longitudinal buckling curves with the S-shaped core is compared with the RLBRB and BRB braces. The results from the comparison of the proposed pattern with conventional buckling braces indicate that, despite the smaller and lighter ones, these braces have the same behavior as the BRB braces.

کلیدواژه‌ها [English]

  • Buckling brace
  • buckling brace with S-shaped core
  • Inactive control system
  • Low cycle Fatigue
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