K形和Y形偏心支撑钢框架滞回性能试验研究

Experimental study on hysteretic behavior of K and Y-eccentrically braced steel frames

进行了1/3缩尺的K形和Y形偏心支撑钢框架的低周反复荷载试验,分析了K形和Y形偏心支撑钢框架在循环荷载作用下的破坏机理、滞回性能、延性、刚度退化规律以及耗能能力。试验结果表明,K形和Y形偏心支撑钢框架均具有较好的延性及耗能能力;K形偏心支撑钢框架横梁的竖向变形较大,Y形偏心支撑钢框架横梁的竖向变形较小;虽然Y形偏心支撑钢框架侧向刚度低于K形偏心支撑钢框架,但也能提供较大的初始抗侧刚度,可满足小震或中震作用下的结构变形要求,同时在大震作用下可以提供良好的变形能力和耗散地震能量的双重功能。

Experiments of K and Y-eccentrically braced steel frames at 1∶3 scale were carried out under low reversed cyclic loading.Failure mechanism,hysteretic behavior,ductility,rigidity degeneration and energy-dissipation were analyzed.Experimental study shows that K and Y-eccentrically braced steel frames could provide well ductility and excellent energy-dissipation capacity.Vertical deformation of beams of K-eccentrically braced steel frames is larger and that of Y-eccentrically braced steel frames is smaller.Later stiffness of K-eccentrically braced steel frames is lager than that of Y-eccentrically braced steel frames,but Y-eccentrically braced steel frames could not only provide certain stiffness under the moderate level of earthquake but also supply enough ability of deformation and energy dissipation under the rare level of earthquake.