رفتار چرخه ای میراگرهای تسلیم شونده فلزی ترکیبی لانه زنبوری و خمشی در اتصالات مهاربندهای شورن

نوع مقاله : مقاله کامل پژوهشی

نویسندگان

گروه مهندسی عمران، دانشکده مهندسی محیط زیست، دانشگاه صنعتی ارومیه

چکیده

در این مطالعه، یک میراگر اتلاف انرژی غیرفعال ترکیبی متشکل از ورق ­های لانه ­زنبوری و خمشی، به ­صورت عددی تحت بارگذاری چرخه ای مورد بررسی قرار گرفته است. ورق ­های انتهایی مثلثی شکل (موسوم به میراگرهای ADAS) می­ توانند تحت اثر خمش دچار تسلیم شوند؛ در حالی که ورق جان لانه ­زنبوری (موسوم به میراگر HSF)، انرژی را از طریق تسلیم برشی اتلاف می ­نماید. برای صحت­ سنجی مدل ­سازی عناصر محدود، نتایج تحلیل­ های عددی میراگرهای لانه ­زنبوری با نتایج آزمایشگاهی مقایسه شده ­اند که انطباق بسیار خوبی بین نتایج عددی و آزمایشگاهی وجود دارد. مجموعاً با انجام تحلیل چرخه ­ای تا دریفت 8% بر روی پانزده مدل میراگر به ­ازای پارامترهای مختلف نظیر تعداد ورق ­های لانه ­زنبوری، تعداد ستون سلول ­های لانه­ زنبوری و ضخامت ورق­ های خمشی ADAS، مشخصه ­های عملکرد لرزه ­ای شامل سختی اولیه، ظرفیت برشی، شکل ­پذیری و اتلاف انرژی مقایسه شده است. نتایج نشان می‌دهند که این میراگر ترکیبی جدید در مقایسه با میراگرهای فقط HSF، دارای افزایش مقاومت 105% و افزایش اتلاف انرژی به ­اندازۀ 23% بوده و بنابراین، با دارا بودن مقاومت و اتلاف انرژی مناسب می‌تواند به­ عنوان یک میراگر فلزی کارآمد برای کاربردهای لرزه‌ای مورد استفاده قرار گیرد. با کاهش تعداد ستون سلول­ های لانه ­زنبوری از چهار به دو، مقاومت و اتلاف انرژی به ترتیب به ­اندازۀ 27% و 55% کاهش می ­یابد. همچنین با کاهش ضخامت ورق ADAS به ­میزان 25% و افزایش ضخامت ورق HSF به­ اندازۀ 33%، کاهش متناظر در مقاومت و اتلاف انرژی میراگر ترکیبی به­ ترتیب برابر 35% و 72% است.

کلیدواژه‌ها

موضوعات

عنوان مقاله [English]

Cyclic Behavior of Hybrid Honeycomb-and-Flexural Yielding Dampers in Chevron CBFs

نویسندگان [English]

  • Bahman Jafari
  • Behzad Shekastehband
Faculty of Civil Engineering, Urmia University of Technology
چکیده [English]

Concentrically braced frames (CBFs) enables high lateral strength and elastic stiffness in comparison with other common systems such as eccentrically braced frames (EBFs) and moment-resisting frames (MRFs). Despite the advantages of the CBF systems, they do not provide considerable seismic energy dissipation capacity due to buckling of the braces under compressive loads. Various types of control systems, such as, friction dampers, viscoelastic dampers, metallic yielding dampers, and etc. have been proposed to mitigate the destructive action of earthquakes on buildings. Among these dampers, metallic yielding dampers are the simplest, cost-effective and easy to fabricate. Among the different metallic yielding dampers, steel plate yielding fuses are the most efficient devices which have been extensively studied by researchers. ADAS is a type of flexural dampers in which the hysteretic energy is achieved through the flexural yielding of steel plates. However, this type of damper suffers from the relatively low initial stiffness (Xia and Hanson 1992). Another type of metallic dampers is the shear link which relies on the inelastic shear deformation of metallic plates under the in-plane loading and offers high initial stiffness and stable energy dissipation (Bakhshayesh et al. 2021). A new shear damper, known as honeycomb structural fuse (HSF), was proposed and developed. The energy dissipation potential of such devices can be improved if the metallic plates are so oriented that they can undergo combined flexure and shear deformation under the action of lateral loading. In this study, a combined honeycomb-and-flexural yielding dampers are proposed as passive energy dissipation systems.

کلیدواژه‌ها [English]

  • Combined yielding dampers
  • Honeycomb dampers
  • Hysteretic behavior
  • Energy dissipation
  • Flexural-Shear

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نشریه مهندسی عمران و محیط زیست دانشگاه تبریز
دوره 54.2، شماره 115 - شماره پیاپی 115
تابستان 1403
شهریور 1403
صفحه 13-24

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