作　　者： ; ; ; ; ; ; ; ; (刘康安）;

机构地区： 中南建筑设计院股份有限公司

出　　处： 《建筑结构》 2011年第7期40-44,49,共6页

摘　　要： 针对西安北站高架层大跨楼盖的振动舒适度问题,建立了整体有限元模型,采用Ritz向量法对结构进行了模态分析,对其振动特性进行了研究。以IABSE建议的单人步行激励为基础,考虑行人起步相位角随机分布,提出了楼盖随机人群荷载模拟方法,对该大跨楼盖进行了人行荷载模拟,并通过多点输入和时程分析法对该楼盖进行了振动舒适度分析。据此分析结果对楼盖进行了MTMD减振设计与分析。结果表明,利用该方法设计MTMD减振系统可以有效地控制大跨楼盖的竖向振动,最大减振率达到89.2%,各工况下平均减振率可达44%。 The vibration serviceability of long-span floors in Xi＇an North Railway Station was studied.A finite element model of a large station room was established,and the modal properties of the structure were analyzed by the Ritz vector method.Then the vibration properties of the long-span floors in this structure were studied.Based on the single person walking forces of IABSE,a new method to model stochastic crowd-induced loads was proposed considering the random distribution of the person＇s initial phase angle,and the human induced loads of the long-span floor were modeled by this method.Then the vibration serviceability of the floors was analyzed by a multi-support excitation and time history analysis method.According to the vibration characteristics of long-span floors,a design method for a long-span floor＇s multiple tuned mass dampers（MTMD） system was concluded from the existing researches,and a MTMD system in the floor was designed and analyzed by this method.The results show that the MTMD system designed by this method can control the vertical vibration of the long-span floor effectively.The maximum attenuation rate under various working conditions is up to 89.2%,and the average attenuation rate is about 44%.

关 键 词： 西安北站 大跨楼盖 随机人群荷载 振动控制 人体舒适度

领　　域： [建筑科学]