基于楼层剪力的等效阻尼比计算方法研究

针对现有附加有效阻尼比计算方法存在的问题,本文从能量的角度揭示了阻尼比对结构影响的机理。从结构设计的角度,提出一种在时程分析下基于楼层剪力的消能减震结构等效阻尼比计算方法。对布置黏滞阻尼器和软钢阻尼器的消能减震模型,采用本文提出的等效阻尼比计算方法,建立等效结构进行结构响应对比。结果表明,由该计算方法得到的等效阻尼比能够准确地评估阻尼器在结构中的耗能效果,建立的等效结构能够准确反映消能减震结构实际情况。基于楼层剪力的等效阻尼比计算方法通过等效结构楼层剪力大于或等于消能减震结构楼层剪力判断迭代完成,该方法计算过程不涉及阻尼器参数及结构形式,适用于所有阻尼器类型与结构类型。计算得到的等效结构进行设计能够确保结构设计的安全。

Research on calculation method of equivalent damping ratio based on story shear force

Aiming at the problems in the existing calculation methods of additional effective damping ratios,this paper reveals the mechanism of the effects of damping ratios on the structure from the perspective of energy.From the perspective of structural design,propose a method based on the story shear force for calculating the equivalent damping ratio of an energy dissipation structure under time history analysis.For the energy dissipation model with viscous dampers and soft steel dampers,the equivalent damping ratio calculation method proposed in this paper is used to establish equivalent structures for structural response comparison.The results show that the equivalent damping ratio obtained by the calculation method can accurately evaluate the energy dissipation effect of the damper in the structure,and the equivalent structure established can accurately reflect the actual situation of the energy dissipation structure.The calculation method of the equivalent damping ratio based on the story shear force is completed iteratively by determining the story shear force of the equivalent structure story shear force is greater than or equal to the energy dissipation structure.The calculation process of the method does not involve damper parameters and structural forms,and is applicable to all damping device type and structure type.The calculated equivalent structure is designed to ensure the safety of structural design.