| 地铁车辆段咽喉区上盖建筑振动传播规律 |
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| 引用本文： | 汪益敏,陶子渝,邹超,陈颖.地铁车辆段咽喉区上盖建筑振动传播规律[J].交通运输工程学报,2022,22(1):112-121. |
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| 作者姓名： | 汪益敏 陶子渝 邹超 陈颖 |
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| 作者单位： | 1.华南理工大学 土木与交通学院, 广东 广州 5106412.广东工业大学 土木与交通工程学院, 广东 广州 510006 |
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| 基金项目： | 国家自然科学基金项目51908139广东省科技计划项目2017A050501005广东省基础与应用基础研究基金项目2021A1515012605 |
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| 摘 要： | 以深圳某带上盖建筑地铁车辆段为工程依托,现场实测了咽喉区列车走行不同线路时,地面层、平台转换层和上盖4层钢框架结构的振动加速度响应,分析了咽喉区列车运行引起的环境和结构振动传播规律.研究结果表明:由于土-结构的动力相互作用,车致振动在从地基土向基础结构的传播过程中存在能量损失,实测结构基底加速度幅值较邻近地面加速度幅值...
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| 关 键 词： | 地铁车辆段 现场试验 振动 传播规律 上盖建筑 |
| 收稿时间： | 2021-09-01 |
Vibration propagation law within over-track buildings above throat area of metro depot |
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| WANG Yi-min,TAO Zi-yu,ZOU Chao,CHEN Ying.Vibration propagation law within over-track buildings above throat area of metro depot[J].Journal of Traffic and Transportation Engineering,2022,22(1):112-121. |
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| Authors: | WANG Yi-min TAO Zi-yu ZOU Chao CHEN Ying |
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| Affiliation: | 1.School of Civil Engineering and Transportation, South China University of Technology, Guangzhou 510641, Guangdong, China2.School of Civil and Transportation Engineering, Guangdong University of Technology, Guangzhou 510006, Guangdong, China |
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| Abstract: | Relying on a metro depot with over-track buildings in Shenzhen, the vibration acceleration responses during trains passing on different tracks in the throat area were measured on-site at the ground floor, platform transfer floor, and the over-track 4-storey steel-framed structure. The propagation laws of environmental and structural vibrations caused by train operations in the throat area were analyzed. Research results show that there exists energy loss when the train-induced vibration propagates from the surrounding soil to the foundation through the soil-structure dynamic interaction. The measured acceleration amplitude at the foundation bottom of the structure is significantly smaller than that at the adjacent ground surface. In the process of train-induced vibration propagation from the surrounding soil to the structure, the high-frequency component above 50 Hz attenuates more rapidly. The soil-structure coupling loss can be up to 27-34 dB. Therefore, the influence of soil-structure coupling loss should be considered when using the foundation bottom inputs to predict the train-induced vibration responses within the over-track buildings at metro depots based on the substructure method. The vibrations at the foundation bottom of the platform columns should be used as the vibration input of the model. The structural designs of over-track platform and transfer floor can help to reduce the upward propagation of the train-induced vibration to some extent. The acceleration level attenuation amplitude is 3-6 dB. The train-induced vibration propagates upward through the platform columns in the form of axial wave and spreads horizontally through the transfer beams and floor slabs in the form of bending wave. The vibration energy has multiple paths to propagate toward the over-track building and superpose. The vibration difference among measuring points on the platform transfer floor is within 8 dB. The vibration propagation law between floors in the over-track building depends on the impedance ratios of beam to vertical load-bearing structure and floor slab to vertical load-bearing structure. Increasing the impedance of the beam or floor slab helps to reduce the upward propagation of vibration. The train-induced vibration frequency within the 4-storey steel-framed structure has three peaks at 6.3, 12.5, and 40.0 Hz, respectively. It is related to the natural frequency of the structure and the dynamic characteristics of the excitation. 3 tabs, 10 figs, 32 refs. |
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