中文摘要：

支座约束对大跨楼盖振动的影响不可忽略，研究支座对大跨楼盖振动的影响对楼盖采取合理有效的减振措施十分重要。通过采用SAP2000软件对高铁枢纽长沙南站站房建立整体有限元模型，采用Ritz向量法对结构进行模态分析，系统地研究了大跨楼盖的竖向振动响应。通过时程分析法和多点输入对两跨支座约束不同的大跨楼盖进行了振动舒适度分析。根据不同大跨楼盖的振动特性，分别提出了调谐质量阻尼器（TMD）的减振设计方法。分析及现场实测结果表明，跨度及结构形式相同而支座约束不同的大跨楼盖的振动响应有差距，分别采取减振措施后，减振效果非常明显。

英文摘要：

Constraint of support has obvious influence on the vibration of large-span floor, thus it is of great importance to analyze the support influence on large-span floor and take effective vibration reduction measures. Vertical vibration response of the large-span floor of Changsha South Railway Station as a high-speed railway hub was calculated according to an overall finite element model by SAP2000 software and the modal analysis of the structure by Ritz vector method. Analysis of comfort level of vibration was carried out on two large-span floors with different support constraints by time-history analysis method and multipoint input method. Tuned mass damper （TMD） was designed to reduce the vibration according to the vibration characteristics of different large-span floors. Numerical analysis and field measurement results show that the vibration responses of large-span floors with the same span, same structural form and different support constraints are different, and obvious vibration reduction effect is observed after applying vibration reduction measures.