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进行了现场实测。对实测信号开展了时频分析,获得了加速度幅值在结构各层的分布,以及结构不同位置的振动能量分布和相位关系,表明地铁运行激励下地下室结构竖向振动显著占优,且结构以单一频率整体振动。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。开展了振级分析,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。
Abstract
In order to study vibration characteristics of basement structures excited by subway trains, field measurement was conducted in a structure over the subway line. The measured acceleration records were evaluated by using time-domain and frequency-domain analysis. The distribution of acceleration amplitude, vibration energy and phase angle among different structure locations was obtained. It is shown that the structure vibration is dominated by its vertical response, and the basement structure as a whole vibrates at one single frequency. Evaluation on human comfort of the structure is provided according to available Chinese code. Vibration level analysis of the measured records was discussed. The result shows the vibration level peaks at its dominating frequency. The results can provide important information for design of superstructure upon this basement structure, as well as for evaluation of similar structures.
关键词
地铁激励 /
地下室结构 /
现场实测 /
结构振动
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Key words
subway excitation /
basement structures /
field measurement /
structure vibration
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参考文献
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