摘要
为研究地下室结构在地铁运行下的振动特征,对位于地铁上方的某工程地下室结构进行了现场实测。对实测加速度响应信号开展了时域和频域分析,获得了地下室结构的振动加速度幅值在各层的分布特征,表明地铁运行激励下地下室结构竖向振动显著占优。分析了地下室结构不同位置的振动能量分布特征和相位关系,表明地下室结构以单一频率整体振动。根据加速度信号的时域和频域特征,依据相关规范对地铁运行下地下室结构的人居舒适度进行了评价。基于实测加速度响应信号开展了振级分析,研究了地下室振动的振级分布特征,表明结构加速度振级在峰值频率取得最大。相关研究结果可为该工程上部结构的设计和同类结构评价提供参考。
In order to study vibration characteristics of basement structures excited by subway trains,field measurement was conducted on a basement structure over the subway line.The measured acceleration records were evaluated by using time-domain analysis and frequency-domain analysis.Based on the results,the distributions of acceleration amplitude on different floors were obtained.It is shown that the structure vibration is dominated by its vertical response.The distribution of vibration energy and the phase angle among different locations in the building were analyzed,which indicates the basement structure as a whole vibrates at one single frequency.The evaluation on human comfort of the basement structure was provided according to available Chinese code.Based on the vibration level analysis of measured records,its distribution was discussed.The result shows the vibration level peaks at its dominating frequency.The results can provide important information for design of superstructure upon the basement structure,as well as for evaluation of similar structures.
出处
《振动与冲击》
EI
CSCD
北大核心
2015年第12期115-120,139,共7页
Journal of Vibration and Shock
基金
国家自然科学基金资助项目(51278191)
关键词
地铁激励
地下室结构
现场实测
结构振动
subway excitation
basement structures
field measurement
structure vibration
