基于位移和剪力降低率的减震设计方法研究

Research on damping design method based on displacement and shear reduction rate

附设黏滞阻尼器后的消能减震结构总阻尼比增加,结构各层位移和剪力明显降低。文中以位移降低率和剪力降低率为减震目标,推导附设黏滞阻尼器消能减震结构单自由度体系位移降低率和剪力降低率的计算公式,绘制减震目标与附加阻尼比的关系曲线,研究附设黏滞阻尼器减震结构中减震目标与附加阻尼比的合理匹配问题,提出基于位移和剪力降低率的黏滞阻尼器减震结构设计方法,并通过实际工程算例验证该设计方法在以一阶振型为主的多自由度框架结构体系中应用的可行性。该设计方法简单明确、操作方便,能够快速进行消能减震结构设计,为黏滞阻尼器在框架结构中的广泛应用提供理论指导。

After the viscous dampers are attached for structure,total damping ratio of the energy dissipation structure is increased,and the displacement and shear force of each layer of the structural system are significantly reduced.In this paper,the displacement reduction rate and the shear force reduction rate are used as the damping target.First,the calculation formulas for the displacement reduction rate and the shear force reduction rate of a single degree of freedom system with a viscous damper energy dissipation structure are derived,and the relationship curve between the damping target and the additional damping ratio is drawn.Then,the reasonable matching of the damping target and the additional damping ratio in the damping structure with viscous damper is studied.Finally,the design method of the damping structure with viscous damper based on the displacement reduction rate and the shear force reduction rate are proposed,and the feasibility of the design method in the multi-degree-of-freedom frame structure system based on the first-order mode shape is verified through a practical engineering example.The design method is simple and clear,easy to operate,which can quickly design the energy dissipation structure,and provides theoretical guidance for the wide application of viscous dampers in frame structure.