Cyclic Behavior Evaluation of Multi-Stage Yielding Buckling-Restrained Braces

سال انتشار: 1403
محل انتشار: چهاردهمین کنگره ملی مهندسی عمران
کد COI اختصاصی: NCCE14_426
زبان مقاله: انگلیسی
تعداد مشاهده: 169

نویسندگان

Structural Engineering Division, Department of Civil Engineering, Faculty ofEngineering, University of Zanjan, Zanjan, Iran.

Jamal Ahmadi

Structural Engineering Division, Department of Civil Engineering, Faculty ofEngineering, University of Zanjan, Zanjan, Iran.

چکیده

Buckling-restrained braces (BRBs) are energy-dissipating members increasingly used to achieve minimum seismic design requirements. However, BRBs experience large permanent deformations under severe earthquake due to the high plasticity of their core and low post-yield stiffness. This paper presents a practical and cost-effective alternative, where a conventional BRB is modified to achieve staged yielding in its core. The proposed multi-stage BRB (MSBRB) consists of isolated parallel cores with differing yield strengths. A low-yield-point (LYP) core utilizes a material with a lower yield strength, while a high-strength steel (HSS) core employs a material with a higher yield strength. This research investigated the effect of different steel combinations on the re-centering behavior and energy dissipation of MSBRB using ABAQUS finite element software. The results demonstrated that the strain hardening and yield point of the steels significantly impact achieving a system with superior seismic performance.

کلیدواژه ها

High-strength steel, Low yield-point steel, Multi-stage buckling-restrained braces, Strain hardening

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