新型开洞软钢板阻尼器的理论及试验研究

Theoretical and experimental study of new type of mild steel plate damper with opening

设计、制造了一种用于结构振动控制的新型高性能开洞软钢板阻尼器.该阻尼器主要通过开洞核心耗能板的弯曲塑性变形来耗散振动能量.首先,利用有限元方法研究了核心耗能板的应力分布,并通过理论推导得到了核心性能参数的计算公式;然后,采用单调加载和往复加载试验,验证了阻尼器的滞回耗能性能.研究结果表明:开设合理的鼓形洞口能够优化耗能板上的应力分布,并且不对其屈服力产生影响;推导出的核心性能参数理论公式能够较为准确地反映新型开洞软钢板阻尼器的工作性能;该阻尼器具有饱满的滞回曲线,并且在大位移加载时,等效黏滞阻尼比均可达到30%以上,表现出良好的滞回耗能和低周疲劳性能.

A new type of high performance mild steel plate damper with opening was designed and manufactured for structure vibration control.The damper dissipated vibration energy through plastic bending deformation of the core plates.First,stress distribution on the core plate was studied by finite element analysis.Then,formulas of the main performance parameters were derived by theoretical methods.Finally,monotonic and cyclic loading tests were carried out to evaluate the hysteretic performance of the damper.The results show that the drum-shaped opening contributes to the uniformity of stress distribution on the core plate without reducing the yield force.The formulas of the main performance parameters can effectively reflect the working performance of the damper.The damper has full hysteresis loops and the equivalent damping ratio can be in excess of 30% at large displacement range.Therefore,the damper exhibits good energy dissipation capacity and low-cycle fatigue performance.