基于黏滞阻尼器的RC框架抗震性能提升设计  

Seismic performance improvement design for RC frame structures based on viscous dampers

作　　者：缪志伟 杨祎环 丛戎 Miao Zhiwei;Yang Yihuan;Cong Rong(Key Laboratory of Concrete and Prestressed Concrete Structures of Ministry of Education,Southeast University,Nanjing 211189,China)

机构地区：[1]东南大学混凝土及预应力混凝土结构教育部重点实验室,南京211189

出　　处：《东南大学学报（自然科学版）》2023年第2期210-217,共8页Journal of Southeast University：Natural Science Edition

基　　金：国家重点研发计划资助项目(2018YFD1100402)。

摘　　要：基于性能化设计理念,对既有RC框架结构提出了一种基于黏滞流体阻尼器的抗震性能提升设计方法.以大震作用下的结构弹塑性位移作为性能控制目标,利用等价高阻尼弹性位移反应谱,通过迭代进行原结构和减震结构的弹塑性位移响应计算.利用算例展示了不同黏滞阻尼器速度指数减震方案的设计结果,并与工程实践中常用的基于小震工况设计方法结果进行对比.结果表明,所提方法可以实现性能设计目标且避免直接对结构多次进行弹塑性时程分析,设计过程高效快捷.该方法更适合采用低速度指数的黏滞阻尼器,在阻尼器成本和结构大震位移响应相同的情况下,相比速度指数为0.6的减震方案,采用速度指数为0.2的阻尼器在中、小震作用下的结构位移响应可以分别减小16%和30%.Based on the concept of performance-based design,a design method of seismic performance improvement for existing reinforced concrete(RC)frame structures using viscous fluid dampers was proposed.The elastic-plastic displacements of structures under large earthquakes were taken as the target of performance control,and the elastic-plastic displacements of the original structure and the damping structure were calculated by iteration using the equivalent high damping elastic displacement spectrum.A practical example was given to show the design results of different viscous damper velocity index schemes,and the results were compared with those of the design method based on the structural responses under minor earthquakes which was commonly used in engineering practice.The results show that the proposed method can ensure the realization of the performance design objective reliably without conducting the elastic-plastic time history analysis on the structure for many times,indicating that the design process is efficient and fast.The proposed design method is more suitable for viscous dampers with low velocity index.In the case of the same cost of the damper and the displacement response of the structure to severe earthquakes,the structural displacement responses using dampers with the velocity index of 0.2 under medium and minor earthquakes can be reduced by 16%and 30%respectively compared with those of the scheme using dampers with the velocity index of 0.6.

关 键 词：RC框架结构 黏滞流体阻尼器 弹塑性位移 等价高阻尼弹性位移谱 抗震性能提升 

分 类 号：TU375.4[建筑科学—结构工程]