Study on Links Length Effect on Y-Eccentrically Braced Frames Seismic Performance

In order to research stiffs,strength and energy-dissipation of Y-eccentrically braced frames in changing length of links,the one-bay two-story test specimen was carried out under low reversed cyclic loading.Process and method of test was introduced.Load capacity,displacement ductility,hysteretic behavior,ductility,energy-dissipation and plastic mechanism of Y-eccentrically braced frames were analyzed.Experimental studies and analysis show that changing lengths of links have effect on strength,stiffness and energy-dissipation capacity of Y-eccentrically braced frames.The length of links is shorter,the Y-eccentrically braced frames strength and stiffness are bigger.The links entering the plasticity to form the plastic mechanism dissipate structure seismic energy.Failure of connection between links and braces causes the structure expiration.Specimens have good displacement capacity and the displacement ductility ratios is between 3.62~4.44.The length of links was designed reasonably,and then Y-eccentrically braced steel frames provide high stiffness and well resistant-seismic.