方形转动摩擦阻尼器滞回性能研究

Study on hysteresis performance of square rotational friction dampers

提出了方形转动摩擦阻尼器的理论滞回模型,推导了滞回曲线理论计算公式并对公式的适用条件加以限制,通过低周往复试验和数值模拟,对该阻尼器的理论模型及计算公式进行了系统性的验证。结果表明:方形转动摩擦阻尼器的理论滞回曲线与试验结果、数值模拟结果在加载位移区间为(-30mm,30mm)内吻合性较好;滞回曲线近似呈喇叭形,曲线饱满,表明该阻尼器具有较强的耗能能力;当方形转动摩擦阻尼器耗能端预紧力较小或摩擦片材料摩擦系数较小时应考虑加载端的摩擦力影响,并对理论计算公式进行进一步修正,为类似工程提供借鉴。

The theoretical hysteretic model of the square rotational friction damper is proposed,the theoretical formula of the hysteretic curve is derived,and the applicable range of the formula is limited.The theoretical model and formula of the damper are systematically verified through low-cycle reciprocating tests and numerical simulation.The results show that the theoretical hysteresis curve of the square rotating friction damper is in good agreement with the test results and numerical simulation results in the loading displacement interval(-30mm,30mm);the hysteresis curve is approximately trumpet-shaped and the curve is full area,indicating that the damper has a strong energy dissipation capacity.When the bolt preload of the square rotating friction damper is small or the friction coefficient of the friction plate material is small,the influence of the loading end should be considered,and the theoretical calculation formula should be further revised to provide reference for similar projects.