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Steel and Composite Structures
  Volume 18, Number 6, June 2015 , pages 1517-1539

Seismic performance of eccentrically braced frames with high strength steel combination
Ming Lian, Mingzhou Su and Yan Guo

    Eccentrically braced frames (EBFs) often use conventional steel with medium yield strength. This system requires structural members with large cross-sections for well seismic behavior, which leads to increased material costs. In eccentrically braced frames with high strength steel combination (HSS-EBFs), links use Q345 steel (specified nominal yield strength 345 MPa), braces use Q345 steel or high strength steel while other structural members use high strength steel (e.g., steel Q460 with the nominal yield strength of 460 MPa or steel Q690 with the nominal yield strength of 690 MPa). For this approach can result in reduced steel consumption and increased economic efficiency. Several finite element models of both HSS-EBFs and EBFs are established in this paper. Nonlinear hysteretic analyses and nonlinear time history analyses are conducted to compare seismic performance and economy of HSS-EBFs versus EBFs. Results indicate that the seismic performance of HSS-EBFs is slightly poorer than that of EBFs under the same design conditions, and HSS-EBFs satisfy seismic design codes and reduce material costs.
Key Words
    high strength steel; eccentrically braced frames; seismic performance; finite element; nonlinear analysis
College of Civil Engineering, Xi'an University of Architecture and Technology, Xi'an 710055, P.R. China.

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