Numerical investigation of earthquake response reduction effects by negative stiffness connection for adjacent building structures.
Numerical investigation of earthquake response reduction effects by negative stiffness connection for adjacent building structures.
复制标题
通过相邻建筑结构负刚度连接减少地震反应效果的数值研究。
DOI：
10.1016/j.istruc.2022.01.078
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发表时间：
2022
期刊：
影响因子：
4.1
通讯作者：
Kazutaka Shirai
中科院分区：
文献类型：
--
作者：
Sonia Longjam;Kazutaka Shirai
相邻建筑的耦合振动控制可以通过合理地设置结构参数，包括连接构件，来降低体系的地震反应。然而，当在连接弹簧处仅使用正刚度或零刚度时，CVC结构的控制效果的优化可能受到限制。本文研究了被动负刚度作为CVC结构主副车架之间的连接元件的控制效果。一个两自由度（2DOF）的模型表示耦合的建筑物，其中包括主框架和副框架连接的弹簧和粘性阻尼元件，被使用。计算了不同结构参数下主、副车架的位移和加速度传递函数。结果表明，通过在连接部分设置最佳负刚度和最佳阻尼，与没有负刚度的参考控制情况相比，主机的TF的峰值幅度显著降低（即，仅具有阻尼元件）。此外，在CVC结构中采用负刚度可以扩大最优调谐条件的范围。此外，进行了时程地震反应模拟使用2DOF模型与不同的自振周期和结构参数进行各种输入运动，包括模拟波和观测记录。结果表明，采用负刚度连接可以有效地降低CVC结构主框架的地震反应。
Coupled vibration control (CVC) for adjacent buildings can mitigate the seismic response of the system by properly setting the structural parameters, including the connecting elements. However, optimization of the control effect for CVC structures may be limited when using only positive or zero stiffness at the connecting spring. The present study explores the control effectiveness by passive negative stiffness as a connecting element installed between the mainframe and subframe of CVC structures. A two-degrees-of-freedom (2DOF) model representing a coupled building, which consisted of the mainframe and subframe linked by a spring and a viscous damping element, was used. The transfer function (TF) for displacement and acceleration of the mainframe and subframe was evaluated under various structural parameters. The results showed that by setting an optimal negative stiffness and an optimal damping at the connecting portion, the peak amplitude of the TF of the mainframe was significantly reduced compared to that of reference-controlled case without negative stiffness (i.e., with only a damping element). In addition, adopting negative stiffness in CVC structures can extend the range of optimal tuning conditions. Moreover, a time history earthquake response simulation was conducted using 2DOF models with different natural periods and structural parameters subjected to various input motions, including simulated waves and observed records. The results indicate that use of the negative stiffness connection can effectively reduce the seismic response of the mainframe for passive CVC structures.