核筒悬挂结构在耦合地震下的抗震分析

Vibration Characteristic of Core-Tube Suspended Structure Subjected to Multi-Dimension Seismic Coupling Excitation

研究抗震性能问题,对新型建筑核筒悬挂结构进行模态分析,并从水平和竖直方向同时输入地震波,研究了其在多维耦合地震激励下的响应。传统抗震计算采用的是层模型,计算精度则不够理想。采用更精确的串并联多质点系模型对结构进行简化,选取实际地震记录的水平和竖向地震波分量作为外部激励,推导其振动微分方程,应用直接积分法对方程进行求解,得到结构不同部位各节点在耦合地震激励下的响应变化规律。将结果与仅水平或竖向单维地震激励下的结构响应作比较,结构部分构件响应有明显差异。仿真计算表明,核筒悬挂结构在耦合地震作用下的抗震性能精度,对悬挂结构进一步的抗震研究和设计具有参考价值。

This paper analysed the mode of core-tube suspended structure and studied its response under multi- dimension seismic coupling excitation. The floor-model which is always used by the traditional seismic analysis has a good adaptability of calculating the horizontal vibration, but it is not very accurate when it comes to vertical vibration. This research used the series-parallel-connection model to simplify structure and chose actual earthquake record to establish the equation. Solved the equation by using direct-integration method, we can get the each node response. By comparison with single-dimension seismic excitation, the response of some components have a significant differ- ence. The conclusion helps the mastery of core-tube suspended structure vibration characteristic and can be refered for the further research and design.