Akademik Veri Yönetim Sistemi
Journal of Constructional Steel Research, cilt.231, 2025 (SCI-Expanded)
This paper presents findings from an experimental program aimed at investigating the behavior of full-scale overlapped core steel-encased buckling-restrained braces (OCSE-BRBs) with different end connections. The primary variables considered include the type of encasing (welded or bolted), end connection detail (pin- or gusset-connection), number of overlapping plates, and local stiffness/detailing of the encasing. Twelve specimens underwent sub-assemblage testing following the loading protocol recommended in the AISC 341–22 specification. The results indicate that the local stiffness of the encasing member has a significant influence on the response. Properly detailed OCSE-BRBs demonstrated an axial resistance exceeding 1000 kN and sustained axial strains ranging between 2.0 % and 3.5 %, with cumulative axial strains exceeding 500 times the yield strain. OCSE-BRBs with gusset-connections outperformed their pin-connected counterparts, despite the former experiencing greater rotational demands. Additionally, cores with three overlapping flat bars were experimented for the first time in this research program. The test results revealed that the axial strains of these OCSE-BRBs were limited to 1.5 %, suggesting the need for further studies to enhance their performance. Finite element analysis was used to examine the behavior of the encasing member under transverse forces generated by high-mode buckling of the core segment. The results highlighted the effectiveness of this technique in determining the local stiffness of the encasing member during the design phase.