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地铁振动作用下高层建筑的振动响应与减振降噪分析

Analysis on Vibration Response and Vibration/noise Reduction of High-rise Buildings Under Subway-induced Vibrations

  • 摘要: 城市轨道交通网加密后,地铁列车诱发的环境振动对沿线建筑室内舒适度影响日益突出,亟需可落地的预测与治理方法。本文以广州某邻近地铁的科技大楼高层建筑为研究对象,首先采用振动传感器收集地铁隧道内部的振动源强数据,同时对现场地表进行振动响应监测,通过得到的隧道源强数据和现场地表的监测数据,利用MIDAS GTS NX建立隧道-地基土-高层建筑的三维有限元数值模型,分析地铁运行振动作用下建筑物各楼层的竖向振动和二次辐射噪声特性,并提出一种减振降噪思路,后期通过现场实测验证了该减振降噪方案的可行性。分析结果表明,无论是否采取建筑减振措施,对建筑各楼层振动响应规律未产生显著差异,均呈现“两侧大,中间小”的趋势,采用建筑减振降噪设计方案后,在控制工程建设成本的基础上,有效减小地铁振动引起的建筑振动响应。通过上述研究方法的闭环思路,最终为城市轨道交通沿线建筑的减振降噪设计与建设提供了有力的理论支撑和实践指导。

     

    Abstract: After the urban rail transit network is encrypted, the influence of environmental vibration induced by subway trains on the indoor comfort of buildings along the line is increasingly prominent, and the prediction and treatment methods that can be landed are urgently needed. This paper focuses on a high-rise technological building adjacent to a subway line in Guangzhou. First, vibration sensors were utilized to collect data on the strength of vibration sources within the subway tunnel, while simultaneous monitoring of the ground surface vibrations was conducted. A three-dimensional finite element numerical model of the tunnel-soils-building interaction was established using MIDAS GTS NX based on the obtained tunnel source strength data and the surface monitoring results. This model analyzed the vertical vibrations and secondary radiation noise characteristics of the building under the influence of subway vibrations. A vibration reduction and noise control strategy were subsequently proposed, which was validated through field measurements, confirming the feasibility of the proposed solution. The analysis results show that no matter whether the building vibration reduction measures are taken, there is no significant difference in the vibration response law of each floor of the building, showing the trend of 'large on both sides and small in the middle'. After adopting the design scheme of building vibration and noise reduction, the building vibration response caused by subway vibration is effectively reduced on the basis of controlling the construction cost of the project. Through the closed-loop idea of the above research methods, it finally provides a strong theoretical support and practical guidance for the vibration and noise reduction design and construction of buildings along the urban rail transit.

     

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