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根据建立的LT-TMD-结构系统的动力放大系数解析式,讨论了LT-TMD的动力特性(包括冲程).数值结果表明,LT-TMD和传统的TMD具有相同的控制有效性和冲程;然而,LT-TMD比传统的TMD具有更大的最优调谐频率比和更小的最优阻尼比.LT-TMD的关键优点是可通过移动支撑的位置来限制LT-TMD弹簧的静力和动力伸长而保持其控制有效性和冲程不变.鉴于此,LT-TMD可能是控制大跨桥梁振动的一种较好的策略.
The dynamic characteristics (including strokes) of LT-TMD are discussed based on the analytic formula of dynamic amplification factor of LT-TMD-structural system.Numerical results show that LT-TMD has the same control effectiveness and stroke as traditional TMD. However, , LT-TMD has a larger optimal tuning frequency ratio and smaller optimal damping ratio than traditional TMDs.The key advantage of LT-TMD is that the static and dynamic of the LT-TMD spring can be limited by moving the position of the support In order to maintain its control effectiveness and stroke unchanged, LT-TMD may be a good strategy to control the vibration of long-span bridges.