摘要
为分析巨型框架半柔性悬挂减振结构体系风振响应控制效果,根据体系的多自由度运动方程,采用复模态叠加法推导随机动力响应表达式;在频域内以控制巨型框架和悬挂楼段风振动力响应为目标,对阻尼器刚度、阻尼系数及悬挂楼段的位置进行分析;在时域内将半柔性悬挂减振结构设定为优化参数,分析其在风和地震作用下的减振效果。结果表明:这种体系能够较好地控制结构风振响应;存在最优的阻尼器刚度和阻尼系数,能够明显减小巨型框架和悬挂楼段的风振动力响应;风振响应的优化参数也可以抑制地震作用下结构动力响应。
The control effects of wind-induced responses of megaframe with semi-flexible suspension systems are analyzed. Formulation of multi-degree of freedom equations of motion and random seismic responses based on a complex mode-superposition method are provided. Parametric studies on the locations of suspended segments, the damping coefficient and stiffness of the dampers, etc., are performed to control the wind-induced dynamic responses of the megaframe and the suspended segments in the frequency domain. Vibration-absorption effects of the megaframe with semi-flexible suspension systems adjusted to the optimal parameters under the excitation of earthquake and wind are studied in the time domain. The results show that this type of structure can effectively reduce wind-induced responses, that there exist optimal damping coefficient and damper stiffness that may lead to minimum wind-induced responses of the megaframe and the suspended segments, and that the optimal parameters obtained from the analysis of wind-induced responses are suitable for seismic vibration control.
出处
《土木工程学报》
EI
CSCD
北大核心
2009年第3期1-7,共7页
China Civil Engineering Journal
基金
国家重点基础研究发展计划(2007CB714200)
国家自然科学基金(50178018)
东南大学优秀博士学位论文基金(0706)
关键词
高层建筑
悬挂结构
风振响应
参数优化
阻尼
tall building
suspension structure
wind-induced response
parameter optimization
damping
