摘要
地铁运行导致周边建筑物出现振动舒适度问题,而楼板振动沿楼层高度的衰减规律尚未明确。为此,对地铁线路附近某高层建筑进行现场实测,分析楼板振动响应特性以及振动沿楼层高度的衰减规律;将建筑结构简化为一维交错变截面杆,递推位移阻抗函数,求得各层楼板结构频响函数,并代入实测荷载和实际结构参数计算结构振动响应的半解析解,理论分析振动放大区现象的发生机理。研究结果表明:实测楼板振动沿楼层高度的衰减呈现出曲折变化趋势,振动最大的部位出现在中间楼层;出现放大现象的楼层在基频处的共振现象更加明显。理论计算表明,地铁振动沿楼层高度呈先增大、后减小的变化趋势,振动最大位置出现在中上部楼层,且楼板跨度越小、柱和墙等竖向构件越密集,放大效应越明显;由于中间楼层具有振动放大现象,因此,不能仅通过测试底层振动判断地铁沿线建筑振动舒适度。
The subway operations have caused vibration serviceability problems in surrounding buildings. However, the attenuation law of floor vibration along the floor height is not clear. Field measurements were conducted on a high-rise building near the subway lines to analyze the response characteristics of floor slab vibration and the attenuation law of vibration along the height of the floor. The building structure was simplified as one-dimensional staggered variable cross-section rods, and the displacement impedance function was calculated recursively. The frequency response functions of each floor structure were obtained and the semi-analytical solution of the vibration response of the structure was calculated by the measured load and actual structural parameters. The theoretical analysis of vibration amplification was conducted to study the occurrence mechanism of the amplification zone. The research results show that the attenuation of the measured floor vibration along the floor height presents a zigzag trend, and the largest vibration part appears on the middle floor. The resonance phenomenon at the fundamental frequency of the floors with the amplification phenomenon is more obvious. Theoretical calculations have calculated that the subway vibration first increases and then decreases along the floor height, and the maximum vibration position appears in the middle and upper floors. In addition, the smaller the floor span and the denser the vertical structural members such as columns and walls, the more obvious the amplification effect is. Due to the phenomenon of vibration amplification in the middle floor, it couldn’t evaluate the vibration serviceability of buildings along the subway line to judge whether the building vibration serviceability is up to standard only by testing the ground floor vibration.
作者
花雨萌
谢伟平
陈斌
HUA Yumeng;XIE Weiping;CHEN Bin(School of Civil Engineering and Architecture,Wuhan University of Technology,Wuhan 430070,China;School of Civil and Transportation Engineering,Ningbo University of Technology,Ningbo 315211,China)
出处
《建筑结构学报》
EI
CAS
CSCD
北大核心
2023年第3期122-129,共8页
Journal of Building Structures
基金
国家自然科学基金面上项目(52278458)。
关键词
高层建筑
地铁环境振动
现场实测
弹性波理论
振动舒适度
振动放大区
high-rise building
subway environmental vibration
field measurement
elastic wave theory
vibration serviceability
vibration amplification area
