بررسی پاسخ مهاربندهای هم محور مجهز شده با فیوز موضعی مقید شده جانبی تحت بارگذاری سیکلی

نوع مقاله : علمی - پژوهشی

نویسنده

عضو هیات علمی (استادیار)، گروه علوم پایه و مهندسی، دانشکده علوم و فنون و منابع سازمانی، دانشگاه علوم انتظامی امین، تهران، ایران

چکیده

مهاربندهای هم محور یکی از متدوال ترین سیستم های مقاوم باربر جانبی در سازه های فولادی می باشند. این مهاربندها از سختی و مقاومت جانبی قابل ملاحظه ای برخوردار هستند اما کمانش فشاری در آنها مانع از شکل پذیری و جذب انرژی مطلوبشان شده است. از همین رو در دهه های اخیر محقیقین مطالعات گسترده ای به منظور اصلاح رفتار مهاربندهای هم محور انجام داده اند که نتایج این مطالعات منجر به ابداع روش های مختلف طراحی و اجرا برای مهاربندهای هم محور شده است. در این مقاله با استفاده از مطالعات آزمایشگاهی و عددی به معرفی روشی جدید به منظور بهبود رفتار مهاربندهای هم محور پرداخته شده است. در این روش از یک فیوز موضعی در طول مهاربند استفاده شده است. این فیوز بوسیله المان های کمکی محصور شده تا بدین وسیله از کمانش موضعی آن تحت بارفشاری جلوگیری شود. این موضوع سبب می شود مهاربند تحت بارگذاری سیکلی در فشار و کشش به صورت مشابه عمل کرده و درنتیجه رفتاری شکل پذیر با جذب انرژی بالا از خود ارائه دهد. همچنین در این مطالعه با استفاده از نتایج کارهای عددی به بررسی موقعیت مناسب فیوز درطول مهاربند و تعیین شکل ظاهری بهینه و اندازه طول مناسب برای آن پرداخته شده است. در انتها نیز در قالب یک مطالعه تحلیلی پاسخ قاب مهاربندی شده هم محور مجهز شده به این سیستم با قاب مهاربندی شده هم محور سنتی مقایسه شده، که نتایج حاصله عملکرد به مراتب بهتر مهاربندهای هم محور جدید نسبت به مهاربندهای هم محور سنتی را به لحاظ شکل پذیری و جذب انرژی نشان داده است.

کلیدواژه‌ها

موضوعات

عنوان مقاله [English]

Investigation of the Concentric Bracings Response Equipped with Lateral Restricted Local Fuse under Cyclic Loading

نویسنده [English]

  • Ali Kachooee
Faculty member, Department of Basic Sciences and Engineering, Faculty of Science and Technology and Organizational Resources, Amin University, Tehran, Iran
چکیده [English]

Concentric bracings (CB) are one of the most prevalent lateral load bearing systems in steel structures. These bracings have a remarkable lateral stiffness and strength, but their compressive buckling prevents them from being ductile and absorbing optimal energy. Consequently, in recent decades, researchers have conducted extensive studies to improve the concentric bracing behavior, which resulted in the development of different design and execution methods for concentric bracings. In this paper, by using numerical and experimental studies, a new method is proposed to improve the behavior of concentric bracings. In this method, a local fuse (LF) is used along the brace. This fuse is restrained by auxiliary elements (AE) to prevent its local buckling under compressive load. This makes the brace behaves in a similar manner in both tensile and compressive cyclic loads, resulting in ductile behavior and high-energy absorption. In this study, by using numerical results, an investigation is done for proper position of the fuse along the braces and its optimal shape and length. In addition, an analytical study has been performed comparing the structural behavior of concentric braces with LF-AE braces. The results have been demonstrated that LF-AE braces have better performance than concentric braces.

کلیدواژه‌ها [English]

  • Steel structures
  • Concentric brace
  • Local fuse
  • Ductility
  • Energy dissipation capacity
  • Loading capacity

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  • تاریخ دریافت: 24 خرداد 1398
  • تاریخ بازنگری: 11 مرداد 1398
  • تاریخ پذیرش: 16 مرداد 1398

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