位移放大型摩擦阻尼器减震结构的抗震性能研究

Study on seismic behavior of displacement amplified friction damper structure

为了确保在输入位移较小时,阻尼器仍能发挥良好的耗能能力,设计了一种基于齿轮传动的位移放大型摩擦阻尼器。对该阻尼器进行拉压循环力学试验,研究位移幅值对其滞回性能的影响,指出位移放大型摩擦阻尼器的滞回曲线饱满,其输出力是普通摩擦阻尼器的η倍(η是大齿轮与小齿轮直径之比),故耗能能力更强。以一六层规则钢框架结构为算例,计算无控结构、普通摩擦阻尼器减震结构和位移放大型摩擦阻尼器减震结构的地震响应,结果表明:与普通摩擦阻尼器相比,位移放大型摩擦阻尼器可更好地控制结构的层间位移角和顶点位移,但二者对结构基底剪力的控制效果接近。

In order to ensure that the damper can still exert good energy dissipation capacity when the input displacement is small,a displacement amplified friction damper based on gear transmission was designed.The influence of displacement amplitude on the hysteretic performance of the damper was studied through tension compression cyclic mechanical tests.It pointed out that the hysteretic curve of displacement amplified friction damper was full,and its output force was that of ordinary friction damperηtimes(ηis the ratio of the diameter of the big gear and the small gear),so the energy consumption is stronger.Taking a six story regular steel frame structure as an example,the seismic responses of uncontrolled structure,ordinary friction damper damping structure and displacement amplified friction damper damping structure were calculated.The results show that compared with ordinary friction damper,displacement amplified friction damper can better control the inter story displacement angle and vertex displacement of the structure,but their control effects on the base shear force of the structure are similar.