بررسی رفتار اتصال تیر فولادی با بال کاهش یافته به وسیله دریل به ستون‌ بتن‌آرمه

نوع مقاله : مقاله پژوهشی

نویسندگان

دانشکده فنی مهندسی، واحد خمین، دانشگاه آزاد اسلامی،خمین، ایران

چکیده

قاب‌های خمشی مختلط ویژه نوع جدیدی از قاب‌های خمشی ویژه هستند که در آن‌ها از ترکیب ستون‌های بتنی و تیرهای فولادی استفاده می‌شود. در این پژوهش، نحوه مدل‌سازی این قاب‌ها و همچنین تأثیر رفتار اتصال بین تیر فولادی و ستون بتنی بررسی شده است. علاوه بر این چون هدف مطالعه بیشتر بر روی تشکیل مفصل است؛ سعی شده است با سوراخ کاری روی بال تیر رفتار این نوع اتصالات بررسی شود. برای مدل‌سازی از نرم‌افزار آباکوس استفاده شده است. برای اتصال یک، دو، سه تا پنج ردیف سوراخ در نظر گرفته شده است. با بررسی نتایج مشاهده شد که سه ردیف سوراخ در اتصال تیر به ستون از لحاظ تشکیل مفصل، توزیع تنش و نیروها از بقیه سوراخ‌ها مناسب‌تر است. در پنج ردیف سوراخ، کرنش پلاستیک تا ردیف چهار مشاهده شده است و در سوراخ پنجم کرنش پلاستیک تشکیل نشده است و این نشان از آن دارد که فاصله سوراخ کاری زیاد شده است و این سوراخ تاثیری در پخش یکنواخت‌تر تنش نداشته است. با بررسی نتایج کمی و عددی مدل‌ها مشاهده می‌شود که محدوده تغییرات لنگر خمشی از حدود 8 درصد تا 46 درصد بوده است و در مدل با سه ردیف سوراخ کاری کمترین مقدار و در مدل با یک ردیف سوراخ بیشترین لنگر رخ داده است. جذب انرژی نیز در محدود 4 تا 20 درصد متغیر بوده است.

کلیدواژه‌ها

موضوعات


عنوان مقاله [English]

Connection Behavior Analysis of Drilled Reduced Beam Flange and Reinforced Concrete Column

نویسندگان [English]

  • Ali Parvari
  • hamed baratali
  • fatemeh shahrokhi
Assistant Professor, Department of Civil Engineering, Khomein Branch, Islamic Azad University, Khomein, Iran
چکیده [English]

Composite special moment frames represent a novel type of special moment frames (SMFs) where a combination of concrete columns and steel beams is used. This paper evaluates the modeling of composite special moment frames and the behavior of the steel beam-concrete column connection. Due to the focus on hinge formation, the behavior of the connection with a hole drilled on the beam flange was analyzed. Numerical simulations were carried out in ABAQUS. The beam-column connection was subjected to one-five rows of holes. It was observed that the beam-column connection with three rows of holes had the optimal hinge formation behavior, stress distribution, and load. The connection with five rows of holes showed plastic strains in the first four rows, while the fifth row had no plastic strain. This suggests an increased drilling space since the fifth hole row did not contribute to the improvement of stress distribution uniformity. It was numerically found that the bending moment change varied from 8% to 46%; the model with three rows of holes had the lowest bending moment change, whereas the model with a single hole row showed the highest change in the bending moment. Moreover, energy absorption changed by 4-20%.

کلیدواژه‌ها [English]

  • Steel connection
  • ABAQUS
  • Circular hole
  • Nonlinear static time-history analysis
  • Shear capacity
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