Experimental study on effect of link beam web depth-thickness ratio on energy-dissipation of Y-shaped eccentrically braced steel frames

Y-shaped eccentrically braced steel frames have high earthquakes resistance and energy-dissipation.In order to research the energy-dissipation of Y-shaped eccentrically braced steel frames in changing depth-thickness ratio of link beam,the one-bay two-story test specimen at one-third scale was made under low reversed cyclic loading.The process of test was introduced and failure mechanism,hysteretic behavior,ductility,rigidity degeneration and energy-dissipation of Y-shaped eccentrically braced steel frames were analyzed.Experimental studies show that Y-shaped eccentrically braced steel frames can provide well ductility and have remarkable energy-dissipation capacity and changing depth-thickness ratio of link beam has effect on strength,stiffness and energy-dissipation capacity of Y-shaped eccentrically braced steel frames.If depth-thickness ratio of link beam was designed reasonably,the Y-shaped eccentrically braced steel frames can not only provide certain stiffness under the moderate level of earthquake but also develop remarkable ability of deformation and energy dissipation under the rare level of earthquake.