上海世博文化中心是2010上海世博会永久性场馆之一,其主体结构由沿环向的36榀悬臂长度不一的钢桁架和矩形钢管混凝土内框架组成.结构六层为悬挑钢结构楼盖,易引起人致振动问题.对采用调谐质量阻尼器(TMD)进行人致振动控制的上海世博文化中心进行了大量的计算分析和现场实测.结果表明结构各榀桁架的竖向共振频率处于2.5 Hz-3.0 Hz之间;当人以2.0 Hz的频率正常行走时,结构竖向振动较小,TMD基本无影响;而当人以结构竖向共振频率快速走动或奔跑时,TMD能有效减小结构的竖向振动响应,减振效率约为15％.这对长悬臂空间结构的舒适度问题和采用TMD进行人致振动控制问题的研究具有参考借鉴意义.%Shanghai Expo culture center is one of the permanent buildings for Expo 2010 Shanghai. Its main structure is composed of 36 hoop cantilever steel trusses with different lengths and inner frames made of rectangle CFST members. The 6-storey steel structure with cantilevered floors easily causes human-induced vibration. A large amount of analysis and field tests were performed for this culture center with tuned mass dampers ( TMDs) used to reduce human-induced vibration. The results showed that the resonance frequencies of each truss are between 2. Ohz and 3. 5Hz; the vertical vibration of the structure is very small and TMDs have no influence on the vibration when people walk normally with frequency 2. Ohz; when people rapidly walk or run with structural resonance frequency, TMDs can reduce the structural vertical vibration about 15% effectively. The results could be a reference for study on serviceability of space structures with long cantilever and human-induced vibration control with TMD.
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