附设粘滞阻尼器的传统风格建筑钢结构双梁-柱节点动力试验研究

A dynamic loading test for steel double-beam column joints in traditional style buildings with viscous damper

将减震技术应用到传统风格建筑钢结构中,在梁-柱节点位置以粘滞阻尼器替代“雀替”。设计了三个传统风格建筑钢结构双梁-柱节点,包括两个附设粘滞阻尼器的节点试件和一个无阻尼器的对比节点试件,模型比例均为1∶2.6。通过周期性动力加载试验研究了滞回曲线、骨架曲线、延性、耗能能力以及刚度退化等抗震性能指标。试验结果表明:附设粘滞阻尼器的传统风格建筑钢结构节点试件的滞回曲线更加饱满,耗能能力优于无阻尼器的对比节点试件,峰值荷载相比提高了34%~46%;各节点试件的位移延性系数介于1.79~1.96,表明附设粘滞阻尼器对节点试件位移延性系数的影响较小;有控节点的等效粘滞阻尼系数是无控节点的1.1~1.5倍,说明设置于梁-柱节点处的粘滞阻尼器发挥了良好的抗震性能。

The technology of seismic energy dissipation was applied to steel traditional style buildings,and the carved angle brace was replaced by viscous damper.Three steel double-beam column joints in traditional style buildings were designed,which include two specimens with viscous dampers and one specimen without viscous damper,the scale model was 1∶2.6.Mechanical behaviors such as the load-displacement hysteretic loops,skeleton curve,ductility,energy dissipation capacity and rigidity degeneration of joints were analyzed by a dynamic cyclic loading test.The results indicate that the steel beam-column joints in antique buildings with installed viscous dampers have more plump hysteresis curves,and its energy dissipation capacity is obviously better than that of the comparing specimen.The ultimate load increase value is between 34%and 46%.The displacement ductility factor is between 1.79 and 1.96,showing that the viscous dampers have less effect on the ductility of specimens.The equivalent viscous damping coefficient of specimens with viscous damper is 1.1—1.5 times specimens without viscous damper,indicating that the viscous damper installed at the beam column joints has a good seismic performance.