بررسی تأثیر ناکاملی های هندسی بر رفتار خرابی نبشی های تحت اثر نیروی فشاری در دکل های مشبک خطوط انتقال نیرو

نوع مقاله : مقاله کامل پژوهشی

نویسندگان

دانشکده مهندسی عمران، دانشگاه صنعتی سهند، تبریز

10.22034/ceej.2024.60562.2329

چکیده

نبشی­ های فولادی، به­ عنوان یکی از مقاطع پرکاربرد در دکل­ های مشبک خطوط انتقال نیرو استفاده می­ شود. به ­کارگیری این نوع مقاطع و همچنین نحوه اتصالات آن­ ها در دکل‌های مشبک، باعث ایجاد خروج از مرکزیت در انتقال بار بین محل اتصال و محور طولی اصلی عضو می­گردد که بر نیروهای داخلی تأثیرگذار است. ازطرفی وجود لغزش اتصالات و انحنای اولیه در اعضا دکل، منجربه یک رفتار پیچیده، به ­ویژه برای اعضای تحت نیروی فشاری می­ شود. این نوع ناکاملی­ ها باعث کاهش ظرفیت در مقایسه با یک عضو ایده ­آل ساده تحت بارگذاری مرکزی می‌شود. با توجه به موارد فوق، به ­منظور مدل‌سازی و پیش ­بینی بهتر حالات خرابی دکل، ارائه رویکردی مناسب در مدل­سازی نبشی­ها ضروری است. در این مطالعه، با به ­کارگیری یک روش ساده در مدل­سازی اعضای نبشی، اثر ناکاملی­ های هندسی (خروج از مرکزیت، لغزش اتصالات و انحنای اولیه) بر روی رفتار خرابی نبشی­ های تحت نیروی فشاری بررسی شده است. برای مطالعه، نبشی ­ها به ­طور مجزا با اتصالات تک­ پیچه و دوپیچه و طول­ های متنوع تحت اثر نیروی فشاری محوری مدل­سازی شده، تحلیل ­های خرابی غیرخطی استاتیکی با استفاده از نرم ­افزار OpenSees انجام شده و سپس رفتار خرابی آن­ها با نتایج مطالعات آزمایشگاهی انجام یافته و ملاحظات مرتبط با آیین ‎نامه‎ های طراحی در این زمینه مقایسه شده است. نتایج مطالعه، حساسیت رفتار خرابی نبشی ­ها به ناکاملی­ ها را نشان داده و از طرفی روش مدل­سازی بکار گرفته شده، پیش ­بینی مناسبی از رفتار و ظرفیت باربری این نوع مقاطع را ارائه می­ دهد.

کلیدواژه‌ها

موضوعات

عنوان مقاله [English]

Investigating Geometric Imperfection Effects on Failure of Steel Angles Under Compressive Force in Power Transmission Line Lattice Towers

نویسندگان [English]

  • Ali Asghar Zekavati
  • Karim Abedi
  • Mohammad Reza Chenaghlou
  • Mohammad Charkhtab Basim
Faculty of Civil Engineering, Sahand University of Technology, Tabriz, Iran
چکیده [English]

This paper presents a study of the behavior of single-angle compression members connected through one leg only with single and double-bolted connections. Non-linear finite element simulations with OpenSees software have been performed, and the results are compared with experimental tests conducted by other researchers. A comparison is also made with the strength predicted by major code provisions. The investigation aims to assess the effect of geometric imperfections, such as eccentricity, joint slippage, and initial crookedness, on the failure of steel angles under compressive force. This will be achieved by presenting a straightforward modeling method for the angle elements.

کلیدواژه‌ها [English]

  • Steel angle
  • Power transmission line lattice tower
  • Geometric imperfection
  • Eccentricity
  • Joint slippage
  • Initial crookedness

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