屈曲约束支撑与黏滞阻尼器的减震效果对比研究

以某钢筋混凝土框架结构工程实例为研究对象，选取与场地条件相匹配的地震动作为激励，在SAP2000程序中计算了该结构在多遇和罕遇地震作用下的非线性动力反应，并在框架结构模型中分别设置屈曲约束支撑和黏滞阻尼器。通过试算确定消能减震装置的参数，使得两种消能减震结构在多遇地震作用下的位移减震率均为40%。在此条件下，对比分析了结构的层间位移角、楼层加速度、基底剪力、柱轴力、塑性铰分布和各层阻尼器的工作状态。分析表明：在多遇地震作用下，屈曲约束支撑增大了结构的加速度响应，而黏滞阻尼器能够减小结构的加速度响应；在罕遇地震作用下，二者均能有效控制楼层的加速度响应，而屈曲约束支撑的位移减震效果更好，但黏滞阻尼器对框架柱内力的减少效果更为显著。

Comparison on seismic response between structures using buckling restrained braces and viscous dampers

In this paper, a nine-story reinforced concrete frame structure was adopted as example, and modeled by using a program named SAP2000. A series of ground motions were selected, and further scaled to the levels corresponding to frequent and rare earthquakes so that the seismic response of the frame structure could be simulated reasonably. After that, buckling restrained braces and viscous dampers were added respectively to the frame. The parameter of dampers were trial calculated until displacement reduction ratios were controlled at around 40% for frequent earthquake. In this way, the seismic responses, including inter-story drift ratio, floor acceleration, base shear, axial compression force of frame columns, distribution of plastic hinges and damper performance were compared. It is concluded that under frequent earthquakes, buckling restrained braces amplify floor acceleration, whereas viscous dampers can effectively reduce floor acceleration. Both buckling restrained braces and viscous dampers can effectively reduce floor acceleration under rare earthquakes, while buckling restrained braces are more effective in reducing displacement, but less powerful in controlling column axial force.