高层建筑加强层粘滞阻尼系统的优化分析

提出了一种设加强层的框架-核心筒结构耗能减振系统,利用加强层与外围框架柱二者之间相对大的位移差,布设竖向粘滞阻尼器.基于结构简化计算简图,分别得到了采用假定振型法和有限单元法的数学模型.基于模态阻尼比,参数分析确定了阻尼器的最优阻尼系数.以一个安装了加强层阻尼系统的高层建筑为例,仿真分析了其在地震激励下的动力响应.研究表明,加强层阻尼系统可以大幅提高结构的模态阻尼比,有效减小结构的动力响应.

Optimization Analysis of the Outrigger Damping System for High-rise Building

A new energy-dissipation system for frame-core tube structure equipped with outriggers was presented, in which vertical viscous dampers were inserted between the outrigger and the perimeter columns to make full use of the relatively big displacement of these two components. The mathematical models of the structural system were obtained with both the assumed mode shape method and the finite element method according to the simplified calculation diagram. Based on the modal damping ratio, the optimal damping constants of linear viscous dampers were determined with parametric analysis. Finally, the seismic response of a frame-core tube structure equipped with outrigger damping system was simulated. It has been shown that the outrigger damping system can significantly increase the modal damping ratios of structures, and effectively decrease the dynamic response of structures.