开孔钢板装配式屈曲约束支撑钢框架抗震性能试验研究

为研究开孔钢板装配式屈曲约束支撑（buckling-restrained brace，BRB）钢框架的抗震性能及框架平面外变形对其抗震性能的影响，对两个相同设计的单层单跨单斜式开孔钢板装配式BRB钢框架分别就是否考虑框架平面外变形情况下进行了拟静力试验，并对相同设计的开孔钢板装配式BRB构件进行了拟静力试验。结果表明：不考虑框架平面外变形和考虑框架平面外变形10mm的开孔钢板装配式BRB钢框架均表现出良好的滞回耗能性能，滞回曲线饱满且基本对称，满足GB 50011—2010《建筑抗震设计规范》最大弹塑性层间位移角1/50的限值要求；框架平面外变形10mm对开孔钢板装配式BRB钢框架平面内抗震性能影响很小，其弹性水平刚度、层间屈服剪力和层间最大剪力受框架平面外变形的影响略为降低，变化范围均在5%以内；框架平面外变形10mm对BRB轴向变形的影响很小，框架中开孔钢板装配式BRB和开孔钢板装配式BRB构件均具有良好的滞回性能，约在1/720层间位移角时先于钢框架进入屈服状态，发挥耗能作用，其滞回曲线饱满，延性良好，累积塑性变形能力系数均大于600，完全满足ANSI /AISC 341-10中要求的大于200的要求。

Experimental study on seismic performance of perforated steel-plate assembled buckling-restrained braced steel frames

To study the seismic performance of perforated steel-plate assembled buckling restrained braced (BRB) steel frames and particularly to examine the influence of out-of-plane deformation on the seismic performance of the frame, two one-story one-bay steel frames with perforated steel-plate assembled BRBs were designed. Quasi-static tests were conducted on the BRB steel frames with and without out-of-plane deformation, and also on an individual perforated steel-plate assembled BRB member with the same design. The results show that the perforated steel-plate assembled BRB frames exhibit good hysteretic energy dissipation performance provided that the out-of-plane deformation is less than 10mm, and have good collapse resistance which meets the requirements of the maximum inelastic drift angle of 1/50 according to the code for seismic design of buildings (GB 50011—2010). The hysteresis loops are plump and symmetrical. A 10mm out-of-plane deformation of the frame has little effect on its in-plane seismic performance.The elastic horizontal stiffness, yield shear force and the maximum shear force of the frames are only reduced by within 5% due to the influence of the out-of-plane deformation of the frame.The out-of-plane deformation of frame also has little effect on the axial deformation of the BRB in the frame.The perforated steel-plate assembled BRB in the steel frames and the individual perforated steel-plate assembled BRB member also have good hysteretic energy dissipation performance. It yields and contributes to energy dissipation at about 1/720 drift angle prior to inelastic deformation of the main frame. Its hysteresis loops are full and its ductility is satisfactory. Its cumulative plastic deformation capacity coefficient is greater than 600, which meets well with the US specification ANSI /AISC 341-10 requirement of 200.