螺旋式钢阻尼器耗能性能研究

Energy dissipation performance study of a spiral steel damper

针对地震作用多向性和随机性的特点,提出了一种具有水平双向耗能功能的螺旋式钢阻尼器。该阻尼器由圆钢弯制成螺旋形状,水平安装在墩顶与梁底之间。基于刚臂法和力法方程,推导了该种阻尼器的承载力计算公式,并采用拟静力循环加载试验研究了阻尼器的滞回性能和低周疲劳寿命。将有限元计算结果分别与理论和试验结果进行了对比。最后研究了螺旋距离、圆钢半径和螺旋半径3个主要形状参数对阻尼器耗能能力的影响。结果表明:螺旋阻尼器的滞回曲线稳定且饱满,具有良好的耗能能力和双向力学行为。

A spiral steel damper with horizontal bi-directional energy dissipation was proposed for the multidirectional and random nature of seismic action.The damper was made of round steel bent into a spiral shape which is installed horizontally between the top of the pier and the bottom of the beam.Bearing capacity equations were derived for the dampers based on the rigid arm method and the force method equations.The quasi-static cyclic loading scheme was carried out to investigate the hysteresis performance and low-cycle fatigue life of the damper.Finite element results were compared with theoretical and experimental results,respectively.Finally,the influence of the three main shape parameters,namely,spiral distance,round steel radius,and spiral radius,on the energy dissipation capacity of the damper was investigated.The results show that the dampers have a stable and saturated hysteretic curve,good energy dissipation,and bi-directional mechanical behavior.