耦合框架平面外变形钢板装配式屈曲约束支撑#br# 钢筋混凝土框架抗震性能试验研究

为了研究双向地震作用下屈曲约束支撑（Buckling-restrained brace，BRB）钢筋混凝土框架平面内抗震性能以及BRB与钢筋混凝土框架在平面外方向的相互作用，考虑框架平面外变形、节点板平面外刚度和屈曲约束支撑外伸段平面外刚度的影响，对4个钢板装配式屈曲约束支撑钢筋混凝土框架及1个钢筋混凝土空框架进行了平面内拟静力试验研究。研究结果表明：①耦合框架平面外变形的BRB钢筋混凝土框架和无框架平面外变形的BRB钢筋混凝土框架平面内层间剪力与层间位移滞回曲线饱满稳定，具有良好的抗震性能；②框架平面外变形在一定程度上减小了钢板装配式BRB钢筋混凝土框架平面内初始水平刚度和承载力，增大了钢板装配式BRB和节点板平面外变形量；③节点板面外刚度的提高增加了框架节点平面外作用力；④钢板装配式BRB面外刚度的增加能减小自身平面外变形，减小其对钢筋混凝土框架平面外作用力。

Experimental study on seismic performance of steel-plate assembled buckling-restrained braced RC frame with out-of-plane deformation

To study the in-plane seismic performance of reinforced concrete(RC) frame with steel-plate assembled buckling-restrained brace(BRB) and the interaction between BRB and RC frame in out-of-plane direction under bi-directional earthquake, quasi-static tests were conducted on four RC frames with steel-plate assembled BRB and one RC frames without steel-plate assembled BRB. The influence of the out-of-plane deformation of frames, the out-of-plane bending stiffness of gusset plates, and the out-of-plane stiffness of the BRB extension section were considered. It is found that the storey shear force and storey drift hysteresis curves of the RC frames with steel-plate assembled BRB are plump and stable with or without the influence of bi-directional seismic action, implying a good seismic performance. The out-of-plane deformation of frames reduced the in-plane initial horizontal stiffness and load-bearing capacity of the RC frames with steel-plate assembled BRB, but increased the out-of-plane deformation of the steel-plate assembled BRB. The increase of the out-of-plane bending stiffness of gusset plates increased the out-of-plane force on the frame; The increase of out-of-plane bending stiffness of the BRB extension section reduced its out-of-plane deformation, but decreased the out-of-plane force of the BRB to the RC frame.