Investigating the behavior of the prequalified ConXL connection strengthened with T-stub

Ghamari, Ali and Tavakoli, Sajad and Putra Jaya, Ramadhansyah and Thongchom, Chanachai (2025) Investigating the behavior of the prequalified ConXL connection strengthened with T-stub. Structures, 78 (109391). pp. 1-13. ISSN 2352-0124. (In Press / Online First) (In Press / Online First)

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Abstract

While the box-columns section provides significant advantages, including a low slenderness ratio that enhances buckling strength, high post-buckling strength, and excellent ductility, the implementation of continuous plates for moment-resisting frames presents a range of challenges. As a result, numerous solutions have been proposed to tackle these issues effectively. Among these, the ConXL connection has emerged as a particularly promising option, demonstrating superior performance and gaining widespread acceptance in the engineering community. This paper focuses on the ConXL connection, conducting a thorough examination of its properties and exploring innovative methods to enhance its performance through both numerical and parametric studies. Specifically, five distinct model types were analyzed: ConXL with Reduced Beam Section (RBS), ConXL without RBS, ConXL with T-stub, ConXL with T-stub and Concrete-Filled Tubular (CFT) columns, and web-connected models. The findings revealed that all variations of the ConXL configurations exhibited satisfactory performance, achieving a rotation capacity that exceeded 0.04 radians. In these instances, the capacity of the connections was shown to surpass 80 % of the plastic moment of the beam. Moreover, the integration of a T-stub significantly improved energy dissipation and ultimate strength within the connection. It was observed that substituting a conventional beam for an RBS increased stress levels in the panel zone and connections. However, optimal performance was attained by incorporating T-stubs into the designed columns, and it was noted that an unfilled column could be effectively utilized, provided that the thickness of the column is appropriately increased.

Item Type:	Article
Uncontrolled Keywords:	ConXL; Connections; Steel; Strength; MRF
Subjects:	T Technology > TA Engineering (General). Civil engineering (General)
Faculty/Division:	Faculty of Civil Engineering Technology
Depositing User:	PM Dr. Ramdhansyah Putra Jaya
Date Deposited:	10 Jun 2025 03:20
Last Modified:	10 Jun 2025 03:20
URI:	http://umpir.ump.edu.my/id/eprint/44750
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