长悬挑结构楼盖人致振动舒适度分析  

Analysis on vibration comfort of long cantilevered structure floor

作　　者：章少华 张锡治[1,3] 丁永君 闫翔宇[1] 朱黎蓬 李星乾 ZHANG Shaohua;ZHANG Xizhi;DING Yongjun;YAN Xiangyu;ZHU Lipeng;LI Xingqian(Tianjin University Architectural Design&Urban Planning Research Institute Co.,Ltd.,Tianjin 300072,China;School of Civil Engineering,Tianjin University,Tianjin 300072,China;Key Laboratory of Coast Civil Structure Safety of Ministry of Education(Tianjin University),Tianjin 300072,China)

机构地区：[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

出　　处：《建筑结构》2022年第24期39-43,81,共6页Building Structure

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。Taking a long cantilever structure floor in Tianjin as the object, the natural vibration characteristics of the long cantilever structure floor and its vibration response under different pedestrian loads are deeply analyzed by establishing its whole finite element analysis model.The analysis results show that the cantilever length of the long cantilever structure floor is large, the vertical stiffness is small, and the vertical natural vibration frequencies of the first two orders are both less than 3 Hz. The low-frequency vertical vibration is within the frequency range of the crowd load excitation, and the vibration peak acceleration of the floor can not meet the specification limit requirements, and vibration damping design is required. After arranging the tuned mass dampers, the vertical acceleration response of the long cantilevered structure floor under the crowd load excitation is significantly reduced, and the vibration reduction rate reaches 72.8%, and the comfort of the floor can meet the requirements of the specification after reducing vibration.

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 

分 类 号：TU393.3[建筑科学—结构工程]