| The concept of eccentric bracing in seismic design of steel building frames has gained substantial acceptance in recent years. In many countries, Eccentrically Braced Frames (EBF) have been used in a number of major buildings. In comparison with conventional framing systems, EBFs meet two basic criteria of seismic design: high stiffness at working load levels and large ductility at rare overloads. The eccentrically braced steel frames (EBF) is a good seismic system which has developed in recent twenty years. Y style eccentrically braced steel frame studied is one of EBF which has some special characters and will be applied widely in the future.Based on the working principle of EBF, the numerial models of single storey Y style eccentrically braced steel frame are established and the mechanism of the models is analyzed under cyclic load. The behavior of H-shaped section links with varying e (the length of the link), h0 (the height of the web) and tw (the thickness of the web) are studied. Then the numerial model of three storeys Y style eccentrically braced steel frame is analyzed. In conclusion, the proposal for designing Y type eccentrically braced steel frames is put up.
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