(1 天津大学建筑设计规划研究总院有限公司, 天津 300072; 2 天津大学建筑工程学院, 天津 300072;3 滨海土木工程结构与安全教育部重点实验室 (天津大学), 天津 300072)

摘要: 以天津某项目长悬挑结构楼盖为对象,通过建立其整体有限元分析模型,对长悬挑结构楼盖的自振特性以及在不同人行荷载激励下的振动响应进行了深入分析。 分析结果表明,长悬挑结构楼盖的悬挑长度大,竖向刚度较小,前两阶竖向自振频率均小于 3Hz;低频竖向振动处于人群荷载激励频率范围内,楼盖振动峰值加速度不满足规范限值要求,需要进行减振设计;布置调谐质量阻尼器后,长悬挑结构楼盖在人群荷载激励下的竖向加速度响应显著减小,减振率达到 72. 8%,减振后楼盖舒适度可以满足规范要求。

关键词: 长悬挑结构; 振动舒适度; 人致激励; 时程分析; 振动控制

中图分类号:TU393. 3 文献标志码:A 文章编号:1002-848X(2022)24-0039-05

DOI:10. 19701 / j. jzjg. LS210315

Analysis on vibration comfort of long cantilevered structure floor

ZHANG Shaohua1,2, ZHANG Xizhi1,3, DING Yongjun1, YAN Xiangyu1, ZHU Lipeng1, LI Xingqian2

(1 Tianjin University Architectural Design & Urban Planning Research Institute Co. , Ltd. , Tianjin 300072, China;2 School of Civil Engineering, Tianjin University, Tianjin 300072, China; 3 Key Laboratory of Coast CivilStructure Safety of Ministry of Education (Tianjin University), Tianjin 300072, China)

Abstract:Taking a long cantilever structure floor in Tianjin as the object, the natural vibration characteristics of the longcantilever structure floor and its vibration response under different pedestrian loads are deeply analyzed by establishing itswhole finite element analysis model. The analysis results show that the cantilever length of the long cantilever structure flooris large, the vertical stiffness is small, and the vertical natural vibration frequencies of the first two orders are both less than3Hz. The low-frequency vertical vibration is within the frequency range of the crowd load excitation, and the vibration peakacceleration of the floor can not meet the specification limit requirements, and vibration damping design is required. Afterarranging the tuned mass dampers, the vertical acceleration response of the long cantilevered structure floor under the crowdload excitation is significantly reduced, and the vibration reduction rate reaches 72. 8%, and the comfort of the floor canmeet the requirements of the specification after reducing vibration.

Keywords: long cantilevered structure; vibration comfort; human-induced excitation; time-history analysis;vibration control

第一作者:章少华,博士,教授级高级工程师,一级注册结构工程师,主要从事预制混凝土结构及高层建筑抗震研究,Email:zshyz99@ 126. com。

[引用本文] 章少华,张锡治,丁永君,等. 长悬挑结构楼盖人致振动舒适度分析[J]. 建筑结构,2022,52(24):39-43,81. ZHANG Shaohua,ZHANG Xizhi,DING Yongjun,et al. Analysis on vibration comfort of long cantilevered structurefloor[J]. Building Structure,2022,52(24):39-43,81.