Considering the performance of the ConXL connection using added T-stubs

Abstract

Among the existing ideas to provide a column section, the box section accounted as a suitable idea for both gravity and lateral loading. Although the box-columns section pertains to a considerable advantage such as low slenderness ratio (increase the bucking strength) and post-buckling strength, and high ductility, providing continued plate for moment resisting frame is complicated. Accordingly, several ideas have been proposed to solve this problem, among them, the use of ConXL connection has better performance and more acceptance. In this paper, the ConXL connection and an idea to improve its performance were studied numerically and parametrically. Results indicated that all types of ConXL pertain to a suitable performance that has a capacity of more than 80% plastic moment of the beam and greater than the rotation of 0.04 rad. Moreover, adding a T-stub increases the energy dissipation and ultimate strength of the connection. This was noted that an unfilled column could be effectively utilized, provided that the thickness of the column is appropriately increased.