بررسی تاثیر تقویت اتصال تیر فولادی به ستون‌های فولادی پر شده با بتن از نوع بولت‌های عبوری با استفاده از ورق ماهیچه‌ای

نوع مقاله : مقاله پژوهشی

نویسندگان

گروه مهندسی عمران، واحد زنجان، دانشگاه آزاد اسلامی، زنجان، ایران.

چکیده

تاکنون در مورد ستون‌های فولادی پر شده با بتن (CFT) و اتصالات آن‌ها تحقیقات فراوانی در کشور‌های مختلف انجام شده است و گزینه‌های متعددی برای اتصالات آن‌ها مطرح شده است، با این وجود اکثر اتصالات گیردار مطرح شده علاوه بر مشکلات اجرایی قابلیت ایجاد شرایط اتصال صلب را نداشته‌اند. برای قاب‌های خمشی فولادی که ستون‌های آن‌ها از نوع CFT است روش‌های نوین و مناسب دیگری جهت بهبود رفتار اتصالات گیردار آن‌ها پیشنهاد شده است. از جمله آن‌ها استفاده از بولت‌های عبوری می‌باشد، که در این پژوهش به تاثیر تقویت این نوع اتصال با استفاده از ورق ماهیچه‌ای پرداخته شده است. در این پژوهش متغیر اصلی افزایش ضخامت ورق ماهیچه‌ای و ضخامت ورق ستون در نظر گرفته شده است. نتایج بدست آمده نشان دادند که با بررسی تشکیل موقعیت مفصل پلاستیک می‌توان گفت که در نمونه بدون ورق ماهیچه‌ای تقریبا در محل اتصال و بر ستون مفصل پلاستیک و کرنش‌های ماکزیمم تشکیل شده است. این در حالی است که در اغلب نمونه‌های دارای ورق ماهیچه‌ای، محل تشکیل مفصل پلاستیک در ناحیه خارج از اتصال و تقریبا در فاصله 20 سانتی­متری از بر ستون تشکیل شده است. همچنین در مقایسه اتصالات دارای ورق ماهیچه‌ای با نمونه بدون ورق، به طور متوسط مقدار انرژی جذب شده 62/22 درصد افزایش یافته و از نظر ظرفیت باربری لنگرخمشی نیز به طور متوسط افزایش 3 درصدی مشاهده می ­شود. در ضمن افزایش ضخامت ورق ستون در اتصال تقویت شده تاثیر بیشتری در افزایش ظرفیت باربری و جذب انرژی نسبت به افزایش ضخامت ورق ماهیچه‌ای  دارد.

کلیدواژه‌ها

موضوعات

عنوان مقاله [English]

Investigation of the effects of Retrofitting the Connection of Steel Beam to Concrete-Filled Steel Tube Column with Bidirectional Bolts by Haunch plates

نویسندگان [English]

  • Khadijeh Ghanbari Soumeh
  • Hossein Parvini Sani
M.Sc. Structural Engineering, Department of Civil Engineering, College of Engineering, Zanjan Branch, Islamic Azad University, Zanjan, Iran.
چکیده [English]

So far, a lot of research has been done on concrete-filled tubes (CFT) columns and their connections in different countries and several alternatives have been proposed for their connections. However, most of the proposed connections are associated with executive problems and have not been able to create rigid connection conditions. On the other hand, in these connections, the load enters the concrete indirectly and the concrete core does not mobilize well against the applied loads. For steel moment frames that columns are of CFT type, new and suitable methods have been proposed to improve the behavior of their fixed connections. Among them are bidirectional bolted connections in this study; the effect of strengthening this type of connection using haunch plated is surveyed. In these models, the main variables are haunch plates and column plate thickness. The results showed that by examining the formation of the position of the plastic hinge, it could be said that in the model without the haunch plate, plastic hinges and maximum strains are formed almost at the connection and on the face of columns. In most models retrofitted by haunch plates, however, the location of the plastic hinge is in the off-connection area, approximately 20 cm side of the column. It has been seen that the CFT connections retrofitted by haunch plates, energy absorption has increased by 22.62% and the moment capacity bearing has increased by 3%.

کلیدواژه‌ها [English]

  • Connection in CFT columns
  • Local buckling
  • Haunch plate
  • Plastic strain
  • Plastic hinge

مراجع

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نشریه مهندسی عمران امیرکبیر
دوره 54، شماره 3
خرداد 1401
صفحه 885-906

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