Abstract
During a strong earthquake, links in eccentrically braced frames (EBF) would suffer inelastic performance while other members remain essentially elastic. Previous researches on the overstrength factor of links are mainly based on cyclic tests of links of EBF. And there is seldom research studying the overstrength factor of links under seismic records. To evaluate seismic demand on members of EBF more accurately, a multi-scale numerical model is used to simulate EBF for dynamic analysis. Five EBF models are designed for incremental dynamic analysis and 48 EBF models are used for nonlinear time history analysis at design level. The results show that seismic demands on beams and braces are highly related to overstrength of links at corresponding story. The overstrength factor of links is close to 1.5 at design ground motion level, and it is larger than 1.25 recommended in AISC 341. In the meanwhile, higher modes of EBF play an important role in the seismic response of high-rise EBF, and seismic axial force demand on columns is less than that recommended in AISC 341.
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