常摩擦TMD地震控制效果的理论和实验研究

Theoretical and experimental studies on seismic control effectiveness of TMD with invariable friction damping

在TMD中采用摩擦阻尼代替传统的粘滞阻尼,可有效降低TMD的造价,从而促进其推广应用。但摩擦元件是非线性的,给摩擦TMD分析和设计造成了一定的困难。为了研究常摩擦TMD地震控制的特点和规律,文中采用时程分析法进行了简谐激励和地震激励下摩擦TMD对单自由度结构响应控制的理论分析;在理论分析结果的指导下,进行了单自由度主结构和摩擦TMD系统在简谐激励和地震激励下的振动台试验。理论分析和试验结果表明:除了频率比和质量比的影响,摩擦TMD的控制效果和摩擦力大小、激励幅值有关,只要参数设置合适,其控制效果是令人满意的;在设计摩擦TMD时要针对激励大小、目标控制效率进行具体分析。

Replacing traditional viscous damping with friction damping TMD can reduce self cost and improve its application to real projects. However, friction element is non-linear, which makes the analysis and design of friction TMD difficult. The seismic control effectiveness of friction TMD is analyzed theoretically and experimentally. The theoretical and experimental results demonstrate that the control effectiveness of friction TMD is influenced by the magnitude of friction force and amplitude of excitation except for the affection of frequency ratio and mass ratio. With only adopting proper parameters, friction TMD can achieve satisfying control effectiveness. When designing friction TMD, the parameters should be determined according to magnitude of excitation and desired control effectiveness.