(1 四川省建筑设计研究院有限公司， 成都 610017；2 四川省建筑设计研究院有限公司复杂结构设计研究中心， 成都 610017) 

［摘要］某景观挑台采用大跨度柔性悬挑钢结构，挑出长度约27m，在人行荷载及山区复杂风场下易发生结构竖向振动。人行荷载作用下的舒适度分析结果表明，结构竖向振动加速度大于规范限值，不满足舒适度要求；采取TMD减振措施后，结构的加速度响应得到了有效控制。根据数值风洞模拟得到的体型系数及Python编程模拟的风荷载时程，采用时域分析法进行风振分析，结果表明，结构振动加速度满足舒适度要求，风荷载单独作用下无需额外采取结构减振措施。人群荷载及风荷载共同作用时结构的竖向振动加速度稳定值小于0.5m/s2，但加速度峰值大于两种荷载分别作用时的加速度峰值之和，因此人行荷载及风荷载对结构的影响不能简单叠加，必要时应进行两种荷载共同作用下的振动分析及减振控制。 

［关键词］大跨度悬挑钢结构；人行荷载；风振分析；舒适度分析；TMD振动控制 

中图分类号：TU393-3 文献标识码：A文章编号：1002-848X(2021)22-0084-06

Comfort analysis and vibration control of a large-span platform 

YANG  Shuheng1,2,  ZHAO  Shixing1,2,  ZHOU  Lei1 

(1 Sichuan Provincial Architectural Design and Research Institute Co., Ltd., Chengdu 610017，China；2 Complex Structure Design and Research Center, Sichuan Provincial Architectural Design and Research Institute Co., Ltd., Chengdu 610017，China) 

Abstract: A landscape platform adopts a large-span cantilever steel structure form with a overhanging length of about 27m, which is prone to vertically vibrate under walking loads and complex wind loads in mountainous area. The comfort analysis results under walking loads show that the vertical vibration acceleration of the structure is greater than the specification limits. After taking TMD vibration absorption measures, the acceleration response is effectively controlled. According to the shape coefficient obtained by numerical wind tunnel simulation and the wind load time history simulated by Python programming, the wind vibration analysis was carried out by time domain analysis. The results show that the vibration acceleration of the structure satisfy the requirements of comfort, and no extra structural vibration reduction measure is needed. When walking loads and wind loads exist simultaneously, the steady acceleration value is less than 0.5m/s2, but the peak acceleration is greater than the sum of accelerations when the two loads act separately. Therefore, the influence of walking loads and wind loads on the structure can not be simply superimposed. If necessary, vibration analysis and vibration reduction control under the two loads should be carried out. 

Keywords:large-span cantilever steel structure； walking load； wind-induced vibration analysis； comfort analysis； TMD vibration control

作者简介：杨姝姮，硕士，工程师，Email：yangshuheng_92@163.com。