مطالعه عددی اتصالی نوین به صورت کاملا پیچی به منظور اتصال گیردار تیر به ستون با استفاده از مقاطع سپری شکل و نبشی جان

نوع مقاله : پژوهشی

نویسندگان

1 دانشکده مهندسی عمران ، دانشکدگان فنی ، دانشگاه تهران

2 دانشکده مهندسی عمران، دانشکدگان فنی، دانشگاه تهران

چکیده

با توجه به تجربیات گذشته مهندسان، معمولا اتصالات جوشی در هنگام زلزله عملکرد مناسبی از خود نشان نمی‌دهند. با این وجود، در همه اتصالات گیردار از پیش تایید صلاحیت شده موجود در مبحث دهم مقررات ملی ساختمان به نحوی از جوش استفاده شده است. به همین دلیل در این مقاله به بررسی یک نوع اتصال گیردار کاملا پیچی با استفاده از مقاطع سپری شکل و نبشی جان پرداخته شده است. ابتدا به کمک مدل‌سازی اجزاء‌محدود و روش اجزای تشکیل دهنده شیوه‌ای برای محاسبه سختی و مقاومت اتصال ارائه شده و پس از طراحی تعداد زیادی اتصال و محاسبه سختی آن‌ها، با استفاده از الگوریتم یادگیری رگرسیون خطی چندگانه یک مدل ساده برای محاسبه سختی اتصال ارائه شده است که نتایج نشان دهنده خطای ناچیز این مدل در محاسبه سختی اتصال می‌باشد. همچنین اتصال مورد نظر از نظر صلبیت نیز بررسی شده است که نتایج نشان دهنده عملکرد صلب آن می‌باشد.

کلیدواژه‌ها


عنوان مقاله [English]

Numerical study of a novel bolted moment connection for beam to column connection using T-shapes and web angle sections

نویسندگان [English]

  • Amir Reza Ghiami Azad 1
  • Mehdi Ghassemieh 2
  • Mehdi Darrehzereshki 2
1 School of Civil Engineering - College of Engineering - University of Tehran
2 School of Civil Engineering - College of Engineering - University of Tehran
چکیده [English]

Based on the past experience of engineers, welded connections usually do not perform well during earthquakes. Nevertheless, welding is used in all prequalified moment connections in chapter 10 of the National Building Code of Iran and as a result, there is a need for a fully-bolted prequalified moment connection for use in intermediate moment frames (IMF) and special moment frames (SMF). Thus, in this paper, a novel type of fully-bolted connection was investigated using T-shaped sections and web angles. First, the finite element model of the connection was developed in Abaqus software and validated with respect to experimental results. Next, using the concepts of Eurocode 3, section 1-8, a method for calculating the stiffness and strength of the connection was presented and was validated with the help of several experimental tests and finite element modeling. The results confirmed the proper performance of this method in predicting the stiffness of the connection. Since finite element modeling and experimental tests require a lot of cost and time, the proposed method can be a good option for engineers. Next, with the aim of parametric study on the connection, a large number of connections were designed based on capacity. Based on the component method, the connections stiffness was calculated using supervised machine learning techniques and multiple linear regression learning algorithm. Next, using the data obtained from the design and component method, a parametric study was performed on the connection and a simple formula was presented to calculate the initial stiffness of the connection. The results of this study show excellent regression performance in predicting connection stiffness. In addition, according to the obtained formula, the depth of the beam and diameter of the bolts connecting the T-shape flanges to the column flange have the most impact on the connection stiffness. Finally, the studied connection was classified according to its rigidity. The results showed that the connection act as fully restrained and can be used in IMF and SMF systems.

کلیدواژه‌ها [English]

  • component method
  • Finite Element
  • Machine learning
  • Bolted connection
  • initial stiffness