考虑楼层刚度的新型消能伸臂结构动力特性研究  

Dynamic characteristics of novel energy-dissipation outriggerstructure considering floor stiffness

作　　者：陈林 谭平[2,3] 徐亚飞[1] 赵啸峰 周福霖[1,2,3] CHEN Lin;TAN Ping;XU Yafei;ZHAO Xiaofeng;ZHOU Fulin(College of Civil Engineering,Hunan University,Changsha 410082,China;Earthquake Engineering Research and Test Center,Guangzhou University,Guangzhou 510405,China;Key Laboratory of Earthquake Engineering and Applied Technology in Guangdong Province,Guangzhou 510405,China)

机构地区：[1]湖南大学土木工程学院,长沙410082 [2]广州大学工程抗震研究中心,广州510405 [3]广东省地震工程与应用技术重点实验室,广州510405

出　　处：《振动与冲击》2023年第15期55-64,共10页Journal of Vibration and Shock

基　　金：国家重点研发计划(2019YFE0112500);教育部创新团队项目(IRT13057);国家自然科学基金(51978185)。

摘　　要：新型消能伸臂结构将伸臂与外框架柱节点断开并垂直连接黏滞阻尼器后利用两者之间的相对变形能获得较大能量耗散,已应用于越来越多的超高层建筑中。基于考虑普通楼层刚度提出新型消能伸臂结构简化等效模型并与ETABS计算结果进行对比,在此基础上分析楼层刚度、楼层数量及楼层梁跨度比等对整体结构主振型阻尼比、频率、最优阻尼系数等影响规律。结果表明:简化等效模型与ETABS计算结果吻合较好,附加阻尼比最大误差为13%;考虑楼层刚度后消能伸臂结构主振型附加阻尼比减小、频率增大;随着楼层梁刚度减小,附加阻尼比增大,最优阻尼比伸臂位置上移,最优阻尼系数增大;利用能量法提出的等效公式能反映楼层刚度对消能伸臂结构的动力特性影响并能简化分析过程,为新型消能伸臂结构的进一步工程应用提供了理论依据。A novel energy dissipation outrigger structure disconnects the outrigger from outer frame column node and vertically connects a viscous damper,it utilizes relative deformation energy between the two to obtain larger energy dissipation,and it has been applied in more and more high-rise buildings.Here,considering stiffness of ordinary floors,a simplified equivalent model for novel energy dissipation outrigger structure was proposed and compared with ETABS calculation results.Then,effects of floor stiffness,floor number,and floor beam span ratio on main mode damping ratio,frequency,and optimal damping coefficient of the overall structure were analyzed.The results showed that the simplified equivalent model agrees better with ETABS calculation results,the maximum error of additional damping ratio is 13%;after considering floor stiffness,additional damping ratio of the structure’s main vibration mode decreases and frequency increases;with decrease in floor beam stiffness,additional damping ratio increases,optimal damping ratio outrigger position moves upward and optimal damping coefficient increases;the equivalent formula proposed using the energy method can reflect effects of floor stiffness on dynamic characteristics of energy dissipation outrigger structure,simplify analysis process,and provide a theoretical basis for further engineering application of novel energy dissipation outrigger structures.

关 键 词：消能伸臂 黏滞阻尼器 楼层刚度 阻尼比 动力特性 

分 类 号：TU318.1[建筑科学—结构工程]