摘要
双阶屈服屈曲约束支撑(DYB)是近年来基于传统屈曲约束支撑(BRB)提出的新型减震概念与装置,根据构造特点可将其分为串联型DYB和并联型DYB两种。分析了两种DYB的简化力学模型,并对其在有限元软件SAP2000中进行模拟,证明了有限元分析方法的准确性。以阻尼+耗能为抗震性能目标进行设计,通过非线性时程分析,对比纯框架结构、BRB框架结构与DYB框架结构在不同地震等级下的抗震性能及构件受力,系统研究了平面框架中DYB框架结构在全过程地震水准下的耗能机理及受力性态,并在三维框架中对并联型DYB的抗震性能进行验证。结果表明:在以阻尼+耗能为抗震性能目标的设计中,不应采用串联型DYB,建议采用并联型DYB进行设计。并联型DYB在多遇地震下即开始耗能,相比传统BRB,其对框架结构在不同地震等级尤其是多遇地震下的抗震性能改善作用最为突出,但在设计时仍需注意并联型DYB带来的“构件内力放大效应”所造成的不利影响。
Based on traditional buckling restrained brace(BRB),double-stage yield buckling restrained brace(DYB)is a new type of concept and device for energy dissipation in recent years.It can be divided into two types according to the structural characteristics:DYB in series and DYB in parallel.Two simplified mechanical models of DYB were briefly analyzed and simulated in finite element software SAP2000,which proves the accuracy of finite element analysis method.The design was carried out with damping and energy-dissipation as the seismic performance goal.By nonlinear time history analysis,seismic performance and member stress of pure frame structure,BRB frame structure and DYB frame structure under different seismic levels were compared.The energy dissipation mechanism and stress behavior of DYB frame structure under different earthquakes levels were systematically studied in plane frame and the seismic performance of DYB in parallel was verified in three-dimensional frame.The results show that DYB in series should not be used in the design of damping and energy-dissipation as the seismic performance goal,and the DYB in parallel is recommended for the design.Compared with traditional BRB,DYB in parallel starts to dissipate energy under frequent earthquakes.It can improve the seismic performance of frame structure under different seismic levels,especially under frequent earthquakes.However,the negative effect of"internal force amplification effect of member"caused by DYB in parallel should be paid attention to in design.
作者
丁洁民
邵聪
刘沛
吴宏磊
王世玉
DING Jiemin;SHAO Cong;LIU Pei;WU Honglei;WANG Shiyu(Tongji Architectural Design(Group)Co.,Ltd.,Shanghai 200092,China;College of Civil Engineering,Tongji University,Shanghai 200092,China)
出处
《建筑结构》
北大核心
2023年第10期1-9,25,共10页
Building Structure
基金
上海市青年科技英才扬帆计划(19YF1451900)
上海人才发展基金(2020057)。
关键词
双阶屈服屈曲约束支撑
框架结构
非线性时程分析
抗震性能
double-stage yield buckling restrained brace
frame structure
nonlinear time history analysis,seismic performance
