A novel dual self-centering variable friction damper (DSC-VFD) brace was introduced to achieve greater post-yield stiffness and a better energy dissipation capability. To evaluate its hysteretic response with a novel flag shape, a new uniaxial material with different loading and unloading stiffnesses was developed based on the OpenSees platform in this study. The actual initial stiffness of the DSC-VFD brace was significantly lower than the theoretical value because of the tube length and pin diameter tolerances. The initial stiffness modification coefficients of the DSC-VFD brace were defined, and their calculation equations were established. Because of the uneven gap openings along the friction plates, the matrix displacement method was applied to determine the different gap openings under the tension and compression stages. Then, the hysteretic response of the DSC-VFD brace was calculated with the user-defined model; the model results were in good agreement with the experimental result, verifying the reliability of the proposed model. Simulation models were used to study the crucial parameters for the hysteretic response of the DSC-VFD brace. Finally, nonlinear dynamic analyses of a four-story braced frame were conducted to study the seismic performance of the DSC-VFD brace with a novel flag shape. The results showed that the DSC-VFD brace with a larger post-yield stiffness provided stable self-centering behavior and an effective energy dissipation capability. The high loading stiffness and energy dissipation ability effectively decreased the deformations of the braced structures and improved their seismic responses.

引入了新型双自定心可变摩擦阻尼器（DSC-VFD）支撑，以实现更高的屈服后刚度和更好的能量耗散能力。为了评估其带有新型旗形的滞后响应，基于OpenSees平台开发了一种具有不同加载和卸载刚度的新型单轴材料。DSC-VFD支架的实际初始刚度由于管长度和销直径公差而大大低于理论值。定义了DSC-VFD支撑的初始刚度修正系数，并建立了计算公式。由于沿着摩擦片的间隙开口不均匀，因此采用矩阵位移法来确定在拉伸和压缩阶段下不同的间隙开口。然后，用用户定义的模型计算DSC-VFD支架的滞后响应；模型结果与实验结果吻合良好，验证了所提模型的可靠性。仿真模型用于研究DSC-VFD支架滞后响应的关键参数。最后，对四层支撑框架进行了非线性动力分析，以研究新型旗形DSC-VFD支撑的抗震性能。结果表明，屈服后刚度较大的DSC-VFD支架具有稳定的自定心性能和有效的耗能能力。高加载刚度和能量耗散能力有效地减少了支撑结构的变形并改善了其地震响应。