Performance improvement of earthquake-resistant steel structure system EBF (Eccentrically Braced Frame) by using modified long links

Abstract

This paper presents the results of a numerical study of the behavior of paired Long links in a modified EBF portal. The aim of the research is to examine the behavior of Long links and their EBF portals numerically against the parameters that influence the behavior of Long links and obtain behavior that approaches the performance of short links according to AISC-341 loading standards. The analysis uses a finite element approach MSC/NASTRAN 2023. The portal is modeled as a shell element supported at the base of the column, lateral loading is carried out at the left end of the beam-column junction (x-axis). While the link element is modeled as a shell element supported at both ends, several nodes in the loading position are allowed to translate in the y-axis direction. The analysis results show the parameters of web thickness, and flange thickness, along with the thickness and geometric stiffeners. Several modeled link types can improve Long-link performance in terms of strength, stiffness, and energy dissipation. However, significant results have not yet been obtained regarding the performance of long links which are close to the performance of sliding links.