装配式转动摩擦阻尼器耗能性能研究

Research on dissipation capacity of an assembled rotational friction damper

为提供可靠的耗能性能且便于震后更换,设计并制作了一种构造形式简单、传力机制明确的装配式转动摩擦阻尼器。在建立其恢复力模型基础上,通过压剪试验机测试阻尼器在不同预紧扭力矩和加载频率下滞回性能,获取滞回曲线、骨架曲线、单位滞回能量曲线及等效阻尼比。结合试验数据验证理论模型的准确性。研究结果表明:阻尼器设计采用的恢复力模型与试验吻合度较高,实测滞回曲线饱满,证明阻尼器的耗能性能良好;摩擦系数、滞回耗能能力与加载频率相关性较小,单位滞回能量随位移幅值增大而增大,同时等效阻尼比变大。

In order to provide reliable energy dissipation performance and easy post-earthquake replacement,an assembled rotational friction damper was designed and fabricated with a simple configuration and clear force-transmission mechanism.Based on the establishment of the resilience model,the damper was tested using a load-shear test machine under the different pre-tightening torque forces and loading frequencies.The hysteresis curves,skeleton curves,unit hysteresis energy curves,and the equivalent damping ratios were obtained and compared with the theoretical predictions to verify the accuracy of the theoretical model.The analysis results demonstrate that the developed resilience model for the damper design has high consistency with the experimental observations.The measured hysteresis curves show plump loops indicating the satisfactory energy dissipation performance of the damper.The frictional coefficient,as well as the hysteresis performance,has little correlation with the loading frequencies.The unit hysteresis energy increases with the increase of the loading displacements.At this moment,the equivalent damping ratio becomes larger.