The Analysis Of Y Style Eccentrically Braced Steel Frames Under Cyclic Load Condering Links Web Changed The Height-thickness Ratio

Eccentrical brace frame (EBF) combine the strength and stiffness of concentrically braced frames (CBFs) with the inelastic behavior and energy dissipation of moment-resisting frames, especially inelastic deformation of link absorbs seismic energy. It is a kind of resistant-Lateralsystem. So, the analysis about response and collapse mechanism of EBFs under seismic loading are not only significant in theoretical aspect,but also important in practice.Based on the working principle of EBF,the numerial models of double storey Y style eccentrically braced steel frame are established and the mechanism of the models is analyzed under cyclic load. Three 1:3-scale steel frame specimens are tested(2 Y style eccentrically braced steel frame and 1 K style eccentrically braced steel frame) .The behavior of links with varying h0(the height of the web) and tw(the thickness of the web) are studied by Ansys10.0. 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 forward.