Seismic Response of 2-D Plane Framed Buildings Eccentrically Braced with Vertical Shear Links

Abstract

There exist a variety of techniques which can be utilized in seismic-resistant structures in order to protect it from earthquake ground motions. One of these techniques is the employment of vertical eccentrically braced frames (V-EBFs) which dissipate energy during seismic hazard by means of yielding of certain elements, commonly referred to as vertical shear links (VSLs), whereas the whole structures is kept safe in the elastic stage. This paper presents a numerical study on 2-D framed buildings equipped with V-EBFs using two finite element software ANSYS Workbench and ETABS. Each of modal analyses, nonlinear static pushover analyses and nonlinear time history analyses have been conducted on 6 different 2-D framed steel buildings configurations equipped with VSLs made of different metallic alloys, particularly magnesium and steel. Also, how the number of V-EBFs in the building and its placement position influence both the global and local behavior of the buildings have been investigated. Finally, general remarks regarding the optimum conditions of equipping V-EBFs in 2-D framed steel buildings have been pointed out (e.g., VSL material of fabrication, V-EBFs number and placement position).

Strengthening of seismically deficient moment-resisting frames with yielding metallic damper

“…Nevertheless, the configuration B5-6 was the only one that failed to improve the seismic performance of the building B5 despite its capability to decrease the number of the plastic hinges lying in the IO stage. This remarks an important point since the configuration B5-6 was installed with the vertical shear links specimen 12 which had the highest yield force among all other specimens, and it also had the maximum amount of dissipated energy when subjected to cyclic loading; Refer to (El-Gammal et al, 2021;Seleemah et al, 2022) for more information. The pushover curves, shown in Fig.…”

“…In addition, (Ghadami et al, 2021;Zhu et al, 2023) investigated links made of low-yield-point steel, whereas (Mirzai & Attarnejad, 2020) studied shear links made of shape memory alloys. (El-Gammal et al, 2021;Seleemah et al, 2022) showed that vertical shear links made of different metallic alloys rather than steel can be adopted in different configurations to upgrade the performance of eccentrically braced frames. In the same manner, (Mohsenian, et al, 2020) illustrated that equipping low to medium rise moment-resisting frames with vertical links can improve their overall response.…”

“…Nevertheless, there exists a gap of knowledge in seismic response of multi-story buildings with vertical shear links made of different metallic alloys rather than steel. Hence, this research is considered as an extended study of the work conducted in (El-Gammal et al, 2021;Seleemah et al, 2022) in which magnesium and steel vertical shear links were used in the first few stories of a 10-story building. On this basis, 5, 10, and 15-story 2-D steel moment-resisting frames strengthened using vertical shear links made of magnesium and steel are considered in this research.…”