Analysis and control of vibration and secondary radiation noise in a star rated hotel building along subway line
To address the issue of vibration and secondary radiation noise disturbance within a proposed hotel building caused by existing shallow-buried subway operations,while also considering how to achieve optimal vibration reduction and noise control within construction cost constraints.A method based on structural and acoustic finite element analysis was employed.Coupled numerical simulations were conducted based on measured data,utilizing a'trial-and-error correction'approach.The validity of the numerical simulations was confirmed through the comparison of K prediction and B prediction.The results show that that secondary radiation noise in certain hotel rooms exceeded acceptable levels,ranging from 0.9 to 6.2 dB(A)above the threshold,which needs to be dealt with.Considering construction costs,a combination of methods including XPS underground continuous isolation trenches,floating floors and indoor sound absorption was proposed,offering a comprehensive improvement of 7 dB(A).With on-site adjustments,vibration and noise control measures were implemented to meet the indoor secondary radiation noise limits for Category 2 sound-sensitive area buildings stipulated in the Standard for limit and measuring method of building vibration and secondary noise caused by urban rail transit(JGJ/T 170-2009).Following completion of interior decoration works,the project passed final inspection and acceptance.
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