基于位移和等价刚度的建筑结构减震控制设计  

Seismic control design of building structure based on displacement and equivalent stiffness

作　　者：蒲武川[1] 梁瑞军[1] 刘传奇 笠井和彦 

机构地区：[1]武汉理工大学土木工程与建筑学院,湖北武汉430070 [2]东京工业大学建筑物理研究中心,东京2268502

出　　处：《建筑结构学报》2016年第S1期71-78,共8页Journal of Building Structures

基　　金：国家自然科学基金项目(51208405)

摘　　要：基于金属屈服型阻尼器和以双线性滞回模型表示的主体结构侧向变形骨架曲线,提出了一种用于结构减震控制的直接基于位移的弹塑性设计方法。建立了单自由度减震系统稳态响应下的等价阻尼比和等价刚度的计算式,推导了平均阻尼比的显式表达式,并将平均阻尼比作为地震作用下减震结构滞回耗能的等价阻尼比。考虑阻尼器不仅向结构系统提供附加阻尼还提供附加刚度,提出了减震结构在目标位移下的等价刚度与层剪力成比例的分配条件,以实现目标位移下结构刚度的分布优化。为考虑高阶振型的影响,提出对基于1阶振型的设计结果的修正方法。采用层剪切模型,对28种具有不同弹性刚度、2次刚度比和屈服位移角分布形式的结构进行减震设计,对非控制结构和控制结构实施了共计336种工况的弹塑性时程分析。结果表明,控制结构的层间位移角较好地控制在目标位移角以内,且各层位移角均匀分布,基本达到预期的变形目标。同时,控制结构的残余变形角更小,离散程度也更小。所提方法可有效地应用于结构的减震控制设计。A new methodology for the direct displacement-based seismic control design of structures is presented. The main structure is simulated by bilinear hysteretic model,and the hysteretic damper is used for suppressing earthquake induced vibration. The equivalent damping ratio and stiffness are defined for inelastic structural system based on steady-state hysteresis,and the averaged damping ratio is derived and used in analysis to account for the randomness of response of structure. It is considered that the dampers provide both damping and stiffness to structure,and a procedure to distribute damper capacity optimally is also presented. The distribution of damper is based on the criteria that the equivalent stiffness of system is compensated by hysteretic damper so as to produce an equivalent stiffness distribution proportional to story shear. A modification method for design is presented to account for the higher mode effect. Passive control design are carried out on 28 example structures with assumed initial stiffness,post-yield stiffness ratio and yield story drift,and a total of 336 cases of time history analysis are performed. The analysis results show that the structures with dampers produce uniform story drift along the height,and the expected structural performance is achieved. Moreover,the residual inter-story drifts are smaller than those of uncontrolled structures. The design method is proved to be applicable for seismic control design of structures.

关 键 词：基于位移设计 弹塑性设计方法 耗能阻尼器 减震控制 

分 类 号：TU352.1[建筑科学—结构工程]