调谐质量阻尼器(TMD)能有效的控制高层建筑结构的风致振动,而TMD子结构往往会产生过大的冲程,且由于荷载不确定性决定其冲程也是不可准确确定的,故必须要进行限位设计。鉴于此,提出了大阻尼TMD系统、开关阻尼限位控制和离位阻尼限位控制三种不同的限位策略,拟对TMD的限位控制进行研究。以广州新中轴线电视塔结构为分析模型,结合TMD系统在运动过程中的8个工作状态,给出了在考虑开关阻尼限位控制和离位阻尼限位控制两种限位控制策略下系统的运动方程,考虑风荷载激励,进行了数值仿真。数值分析的结果表明:不同限位间距时,两种限位工况对系统位移、加速度响应的峰值和均方值控制效果规律不尽相同;对于开关限位控制,当限位距离为TMD最优行程的36%时,在损失约4%的控制效果的前提下,TMD行程的限制效果约为45%;当TMD行程相同时,与大阻尼TMD系统相比,其控制效果要高出8%;离位限位控制对结构加速度峰值有更好的控制效果。恰当的选择限位距离和限位阻尼系数,既能显著地降低风致振动下结构的舒适度,又能有效调节TMD的振动控制效果和减小TMD的行程。
It is effective for the Tuned Mass Damper(TMD) to reduce the vibration response of high buildings under the wind excitation, but the displacement of the TMD sub-structure is too much bigger. So it is necessary for us to design the parameter for limiting position of TMD in the applications. Firstly, the dynamical characteristic of analysis model, which is the Guangzhou new TV tower that will be the first highest tower among the world, is introduced. The system equilibrium equations of the two limiting cases, which include on-off damper limiting position and OE(off-equilibrium)- damper limiting position control strategies, are deduced. Under the fluctuating wind excitations the simulation analysis is done. And the results show that the limiting position distance is the key point to decide the OE and On-Off damper control method, which is more effective to control different objective. When the position distance is about 36% of the classical TMD displacement response, the TMD’s displacement response with limiting position can be reduced about 45% with only 4% control effect loss. And it is more effective for the OE-damper limiting postion strategy to control the main structure acceleration peak response. So it is significant to choose right limiting distance and damping parameter to design the limit position system according to the different object demand.