非线性TMD应用对高层框筒结构减震效果的影响

Influence of nonlinear TMD application on antivibration tall framed-tube structure

当前减震技术中,基础隔震效果较好,使用较多,但对建筑本身要求较高,使用范围受限;在强震下,具有消能减震体系的结构减震效果较好,但需要提供较大阻尼,经济投入较多.在充分结合橡胶支座基础隔震和TMD研究成果的基础上,提出非线性TMD的减震技术方法.在一高层框筒结构中采用该减震技术,并用有限元软件分析结构的地震响应,包括主结构和TMD子结构的层间位移、层加速度和位移时程曲线等,各指标均反映出结构的明显减震效果.为高层建筑结构的减震控制提出一种新的技术思路.

The base isolation in current damping-isolation technology exhibits a good effect and is used more frequently. However, the demand to the building itself is higher and its usage limited. Under strong earthquake, the damping effect of damping-isolation structure is better, but need to provide larger damp ing and larger economic investment. A non-linear TMD damping-isolation technology was put forward on the basis of TMD research result of base isolation with rubber bearings for base isolation. By making a model of high frame-tube structure with this non-linear TMD damping technology and analyzing seismic response of the structure with finite element software, the layer-to-layer displacement, layer acceleration, and time-history curves of displacement and acceleration were obtained for the main structure and TMD substructure. These indicators reflected a good damping effect of the structure, providing a new technical idea of vibration damping for tall structures.