黏滞阻尼减震框架结构基于预设阻尼分布模式的简化设计方法

Simplified Design Method of Viscous Damping Frame Structure Based on Preset Damping Distribution Mode

提出了一种适用于黏滞阻尼减震框架结构基于性能需求和概念优化的设计方法以简化此类减震结构的阻尼参数设计过程。为使得阻尼器能够更有效发挥其耗能作用,从概念角度假定阻尼参数沿楼层的分布与结构层间位移角成正相关的关系,并给出了阻尼参数的分布表达式。在此预设阻尼分布模式下,推导了多层减震结构等效附加阻尼比与各层附加阻尼参数的关系。结合基于性能的设计理念,提出以减震比作为减震设计目标,减震结构的需求附加阻尼比可根据减震比和抗震设计反应谱的阻尼衰减关系来确定,结合预设阻尼参数分布表达式即可快速计算出各层的需求阻尼参数。给出了所提出方法的具体实施流程,并对一个框架结构进行了增设黏滞阻尼器的减震设计和抗震性能验算,设计实例表明该方法具有设计目标明确、计算过程简单、参数配置合理等特点。

A design method based on performance requirements and conceptual optimization for viscous damping frame structures was proposed to simplify the design process of damping parameters of such damping structures.In order to make energy dissipation of the damper more effectively,it was assumed conceptually that the distribution of damping parameters along the floor is positively correlated with the story drift angle,and the distribution expression of damping parameters was given.Under this preset damping distribution model,the relationship between the equivalent additional damping ratio of multi-story damping structure and the additional damping parameters of each layer was derived.Combined with the performance-based design concept,it was proposed that the damping ratio is taken as the damping design goal,and the required additional damping ratio of the damping structure can be determined according to the relationship between the damping ratio and the damping attenuation of the seismic design response spectrum.Combined with the distribution expression of preset damping parameters,the required damping parameters of each layer can be calculated quickly.The damping design and seismic performance checking calculation of a frame structure with viscous dampers were carried out.It was shown by the design example that the method has clear design goal,simple calculation process and reasonable parameter configuration.