新型金属-摩擦阻尼器试验研究及数值分析

Experimental study and numerical analysis of mixed friction buckling restrained braces

传统的屈曲约束支撑通常被设计为在大震作用中消耗能量,小震作用下为该结构提供了抗侧刚度。为了克服这一缺点,结合屈曲约束支撑和长圆孔摩擦阻尼器的工作原理,提出了一种基于屈曲约束支撑和长圆孔摩擦阻尼器串联的新型阻尼器,对该阻尼器进行了低周反复荷载试验,分析了其滞回性能、刚度退化等。试验结果表明:新型金属-摩擦阻尼器滞回曲线饱满,通过设置不同的螺栓预紧力可以使阻尼器达到分阶段能耗的目标。利用ABAQUS数值仿真软件对新型金属-摩擦阻尼器进行了数值分析准确性验证。并通过改变模拟试件屈服比例值,了解屈服比例变化对新型金属-摩擦阻尼器抗震性能的影响。结果表明:数值模拟滞回曲线与试验曲线基本一致;屈服比例的增加对阻尼器刚度退化、滑动承载力有明显影响。

Traditional buckling constraint supports are often designed to consume energy during rare earthquakes,which provide lateral stiffness to the structure under frequent earthquake.In order to overcome this shortcoming,Combined with the working principle of buckling constraint support and long hole friction damper,mixed friction buckling restrained braces based on buckling constraint support and long hole friction damper in series is proposed.The damper was subjected to low-cycle repeated load tests,and hysteresis performance and stiffness degradation were analyzed.The experiment results show that mixed friction buckling restrained damping hysteresis curve is full.By setting different bolt preloads,the damper can reach the goal of phased energy consumption.The numerical analysis of mixed friction buckling restrained damper was verified by ABAQUS numerical simulation software.By changing the yield ratio value of the simulated specimen,the influence of the yield ratio change on the seismic performance of the new metal-friction damper is confirmed.The results show that the numerical simulation hysteresis curve is basically consistent with the experimental data.The increase of yield ratio has a significant impact on the stiffness degradation of the damper and the sliding bearing capacity.