PTMD Control on a Benchmark TV Tower under Earthquake and Wind Load Excitations
PTMD Control on a Benchmark TV Tower under Earthquake and Wind Load Excitations
复制标题
地震和风荷载激励下基准电视塔的 PTMD 控制
DOI：
10.3390/app7040425
复制
发表时间：
2017
影响因子：
2.7
通讯作者：
Chen Shanghong
中科院分区：
文献类型：
--
作者：
Lin Wei;Song Gangbing;Chen Shanghong
介绍了一种利用碰撞过程耗散能量的调谐质量阻尼器（PTMD）。在提出的PTMD中，粘弹性层附着在冲击限制环上，以便能量可以进一步消耗并转化为热能。提出了一种改进的冲击力模拟模型，并通过实验进行了验证。通过传统的赫兹冲击模型验证了该模型的准确性。结果表明，改进后的模型能较好地预测冲击力峰值。然后以超高层结构广州塔为主体结构进行模拟。模拟了非受控、tmd控制和PTMD控制系统在风和地震作用下的动力响应。与传统的tmd对输入激励和质量比敏感不同，PTMD在不同地震记录和不同烈度的激励下仍能保持稳定的控制效率。特别是，当考虑到极端地震时，可以观察到更多的改进。所提出的PTMD能够以更低的质量比实现类似甚至更好的控制效果。这些结果表明，PTMD具有良好的适应性和对建筑物抗震保护的适用性。然后进行了参数化研究，考察了质量比和间隙值对控制效率的影响。结果表明，优化间隙值可以保证较好的控制效果。
A pounding tuned mass damper (PTMD) is introduced by making use of the energy dissipated during impact. In the proposed PTMD, a viscoelastic layer is attached to an impact limitation collar so that energy can be further consumed and transferred to heat energy. An improved numerical model to simulate pounding force is proposed and verified through experimentation. The accuracy of the proposed model was validated against a traditional Hertz-based pounding model. A comparison showed that the improved model tends to have a better prediction of the peak pounding force. A simulation was then carried out by taking the benchmark Canton Tower, which is a super-tall structure, as the host structure. The dynamic responses of uncontrolled, TMD-controlled and PTMD controlled system were simulated under wind and earthquake excitations. Unlike traditional TMDs, which are sensitive to input excitations and the mass ratio, the proposed PTMD maintains a stable level of control efficiency when the structure is excited by different earthquake records and different intensities. Particularly, more improvement can be observed when an extreme earthquake is considered. The proposed PTMD was able to achieve similar, or even better, control effectiveness with a lower mass ratio. These results demonstrate the superior adaptability of the PTMD and its applicability for protection of a building against seismic activity. A parametric study was then performed to investigate the influence of the mass ratio and the gap value on the control efficiency. A comparison of results show that better control results will be guaranteed by optimization of the gap value.