半刚性悬挂结构体系减振避震机理及参数优化  

Earthquake avoidance mechanism and parameter optimization for semi-rigid suspended structures

作　　者：张伟[1] 张继文[1] 涂永明[1,2] 赵洁[2] 

机构地区：[1]东南大学混凝土及预应力混凝土结构教育部重点实验室,江苏南京210096 [2]华南理工大学亚热带建筑科学国家重点实验室,广东广州510640

出　　处：《建筑结构学报》2010年第12期40-47,共8页Journal of Building Structures

基　　金：国家自然科学基金项目(50808039);江苏省自然科学基金项目(BK2008148;BK2009138);教育部博士点基金新教师项目(20070286095);华南理工大学亚热带建筑科学国家重点实验室开放研究项目(2008KB24)

摘　　要：提出了一种新型悬挂结构体系——半刚性悬挂结构体系。该结构体系在悬挂楼段与转换层之间设置半刚性层,其间设置减振阻尼装置。通过时域内输入El Centro波、Taft波以及人工波,验证了该体系具有良好的动力响应特性。根据随机振动理论,在复数域内推导了体系的随机振动响应表达式;以主体核筒结构顶点位移和半刚性层的层间位移为目标函数,编制了MATLAB计算程序,对体系中影响结构动力响应的阻尼器的刚度和阻尼、悬挂质量比及半刚性连接的转动刚度等进行参数分析。计算结果表明:该体系能够有效减小地震动力响应,半刚性层的层间位移较大,主体结构顶点位移和悬挂楼层的层间位移较小;对于文中给出的结构算例存在最优参数组合:阻尼器刚度和阻尼分别为1×107N/m和1×107N.s/m,悬挂质量比取3.0,半刚性连接转动刚度为3.14×104N.m/rad;当半刚性悬挂结构的参数取得最优组合时,主体结构动力响应和半刚性层层间位移均可得到较好的控制,结构的减振避震性能明显提高。A novel suspended structure system,namely semi-rigid suspended structure,was presented in this paper.The semi-rigid stories were set between suspended segments and transfer stories,and vibration absorption dampers were installed.The El Centro,Taft and artificial seismic waves were used to calculate the dynamic characteristics of the system in the time domain,of which dynamic responses were proved satisfactory.Based on the random vibration theory,random seismic responses of the structure system were derived in complex field.The structural parameter optimization analysis of the stiffness and damping coefficient of dampers,the suspended mass ratio and the rotational stiffness of semi-rigid connection were performed with MATLAB by taking the top floor displacement of the primary core-tube structure and the inter-story displacement of the semi-rigid story as objective function.The results show that the seismic responses of this novel structure can be reduced effectively,with relatively larger inter-storey displacement in the semi-rigid stories and relatively smaller inter-story displacements in the top floor displacement of primary structure and in the suspended stories.The optimal parameter combination of the calculation example in this paper is the stiffness and damp of dampers set as 1 × 107N/m and 1 × 107 N.s/m respectively;suspended mass ratio set as 3.0;the rotational stiffness of semi-rigid connections set as 3.14 × 104N.m/rad.When the structural parameters are optimal value,the seismic responses of the primary structure and inter-story displacement of semi-rigid story can be well controlled,and the earthquake avoidance performance of the structure is improve obviously.

关 键 词：悬挂结构 半刚性连接 半刚性层 减振避震机理 参数优化 

分 类 号：TU351.01[建筑科学—结构工程]