大跨度叠层连廊步行振动响应及减振控制研究

Vibration Response and Vibration Control of Long Span Laminated Corridors

为研究西安站东配楼大跨度叠层连廊振动舒适度问题,文中通过建立叠层桁架的空间有限元模型,利用Ritz向量法对大跨度叠层结构进行了模态分析和人行荷载振动响应分析,采用调谐质量阻尼器进行了竖向舒适度控制,分析了对连廊振动响应的影响因素。研究结果表明:通过对比不同调谐质量阻尼器布置方案的结构加速度响应,获取了叠层连廊采用多频率被动调谐质量阻尼器的合理方案,布置多频率TMD后连廊结构步频为1.4 Hz和1.5Hz的峰值加速度,相比于原结构的减振率分别为58%和35%,相比于单频率TMD的峰值加速度的减震率提高了9%和25%,布置多个不同频率的TMD对连廊的减振效果减振效果更为明显,舒适度满足设计要求。

The study is intended to deal with the vibration serviceability of the long span laminated corridor of the eastern building in the Xi’an station.The spatial finite element model of the laminated truss was established.The structural modal analysis and pedestrian load vibration response analysis of the long span laminated corridor were made by the Ritz vector method.A tuned mass damper(TMD)was used to control the vertical comfort,and the factors for the vibration response of the corridor were explored.The results show that by comparing the structural acceleration response of different layouts of the tuned mass damper,a reasonable arrangement of the multi frequency passively tuned mass damper adopted for the laminated corridor is obtained.After the multi frequency TMD is used,the peak accelerations of the corridor structure with step frequency of 1.4 Hz and 1.5 Hz are 58%and 35%respectively compared with the original structure,and the damping rate is increased by 9%and 25%compared with the peak acceleration of single frequency TMD,arranging multiple TMDs with different frequencies has more obvious damping effect on the corridor,and the comfort meets the design requirements.