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

با توجه به تجربیات گذشته‌ی مهندسان، معمولاً اتصال‌های جوشی در هنگام زلزله، عملکرد مناسبی از خود نشان نمی‌دهند. با وجود این، در همه‌ی اتصال‌های گیردار از پیش تایید صلاحیت شده‌ی موجود در مبحث دهم مقررات ملی ساختمان به نحوی از جوش استفاده شده است. به همین دلیل در نوشتار حاضر، به بررسی یک نوع اتصال گیردار کاملاً پیچی با استفاده از مقاطع سپری‌شکل و نبشی جان پرداخته شده است. ابتدا به کمک مدل‌سازی اجزاء محدود و روش اجزاء تشکیل‌دهنده،شیوه‌یی برای محاسبه‌ی سختی و مقاومت اتصال ارائه شده و پس از طراحی تعداد زیادی اتصال و محاسبه‌ی سختی آنها، با استفاده از الگوریتم یادگیری رگرسیون خطی چندگانه، یک مدل ساده برای محاسبه‌ی سختی اتصال ارائه شده است، که نتایج نشان‌دهنده‌ی خطای ناچیز مدل مذکور در محاسبه‌ی سختی اتصال است. همچنین اتصال مورد نظر از نظر صلبیت نیز بررسی شده است، که نتایج نشان‌دهنده‌ی عملکرد صلب آن است.

numerical study of a novel bolted moment connection for the beam to column connection using tshapes and web angle sections

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 fullybolted prequalified moment connection for use in intermediate moment frames (imf) and special moment frames (smf). thus, in this paper, a novel type of fullybolted connection was investigated using tshaped 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 18, 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 tshape 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 studied connection acted as a fullyrestrained connection and can be used in imf and smf systems.