基于位移和等价刚度的建筑结构减震控制设计

发布时间：2018-05-26 14:36

本文选题：基于位移设计 + 弹塑性设计方法　；参考：《建筑结构学报》2016年S1期

【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。
[Abstract]:Based on the metal yield damper and the lateral deformation skeleton curve of the main structure represented by a bilinear hysteretic model, a direct displacement-based elastoplastic design method is proposed for structural vibration control. The equivalent damping ratio and equivalent stiffness of a single-degree-of-freedom damping system under steady state response are established. The explicit expression of the average damping ratio is derived, and the average damping ratio is taken as the equivalent damping ratio of the hysteretic energy dissipation of the structure subjected to earthquake. Considering that the dampers provide not only additional damping but also additional stiffness to the structure system, the distribution condition of equivalent stiffness and shear force of the structure under the target displacement is proposed to optimize the distribution of the stiffness of the structure under the target displacement. In order to consider the influence of high order modes, a modified method is proposed for the design results based on the first order modes. In this paper, 28 kinds of structures with different elastic stiffness / second stiffness ratio and yield displacement angle distribution are designed by means of story shear model, and the elastoplastic time history analysis of uncontrolled structure and control structure is carried out in 336 cases. The results show that the interstory displacement angle of the control structure is well controlled within the target displacement angle, and the displacement angle of each floor is uniformly distributed, which basically achieves the expected deformation target. At the same time, the residual deformation angle of the control structure is smaller and the degree of dispersion is smaller. The proposed method can be effectively applied to the vibration control design of structures.
【作者单位】：武汉理工大学土木工程与建筑学院;东京工业大学建筑物理研究中心;
【基金】：国家自然科学基金项目(51208405)
【分类号】：TU352.1

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