Journal of Structural and Construction Engineering

Journal of Structural and Construction Engineering

Experimental Study of the Effect of Using Stiffener in T-stub Steel Connections Under Cyclic Loading

Document Type : Original Article

Authors
Mehrdad RasouliTabar 1
Mehrzad TahamouliRoudsari 2
Parham Memarzadeh 3
Farshid Fathi 4
1 Ph. D. Student, Department of Civil Engineering, Najafabad Branch, Islamic Azad University, Najafabad, Iran
2 Associate Professor, Department of Civil Engineering, Kermanshah Branch, Islamic Azad University, Kermanshah, Iran
3 Associate Professor, Department of Civil Engineering, Najafabad Branch, Islamic Azad University, Najafabad, Iran.
4 Assistant Professor, Department of Civil Engineering, Najafabad Branch, Islamic Azad University, Najafabad, Iran.
10.22065/jsce.2024.451453.3386
Abstract
Connections in steel structures are one of the most important parts of the load-carrying system in buildings. T-stub connections are particularly important due to the absence of welding in connection components. To improve the seismic parameters in this type of connection, the use of a stiffener in the T-stub connection Tee section is proposed in this research. Three full-scale experimental specimens were constructed and tested in the laboratory to evaluate the proposed design performance. In this research, cyclic and quasi-static loading was applied to experimental specimens. The hysteresis diagram was obtained for the laboratory samples and based on that, the backbone diagram and the equivalent bilinear diagram were drawn. Based on the equivalent bilinear diagram, seismic parameters for the samples were calculated and compared. The first sample was designed and constructed based on the design method provided in the ANSI/AISC 358-16 regulations. In the subsequent samples, the desired stiffener with two different thicknesses of 8 and 10 mm was added to the connection. The results of the tests were analysed and the ultimate moment, effective stiffness, ductility, and energy dissipation capacity parameters were calculated and evaluated. The results demonstrated that adding the stiffener to the T-stub connection enhanced the seismic performance of the connection. The results indicated that in samples with 8 and 10 mm stiffener thickness, the ultimate moment increased by 9% and 14%, respectively; The effective stiffness has been improved by 44% and 92%, and the energy dissipation capacity by 54% and 67%, respectively. Also, the plasticity for samples with stiffeners has grown by 12% and 58%, respectively. The results also demonstrated that the thickness of the stiffener has a significant effect on the behavior of the proposed connection.
Keywords
Steel connection
T-stub
Ultimate moment
Ductility
Energy dissipation capacity
Steel stiffener
Experimental test

Subjects

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  • Receive Date 07 June 2024
  • Revise Date 19 August 2024
  • Accept Date 06 November 2024