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Zou, Chao; Wang, Yimin; Moore, James A.; Sanayei, Masoud, E-mail: zouchao226@gmail.com, E-mail: ctymwang@scut.edu.cn, E-mail: jmoore@acentech.com, E-mail: masoud.sanayei@tufts.edu2017
AbstractAbstract
[en] Transit-oriented development, such as metro depot and over-track building complexes, has expanded rapidly over the last 5 years in China. Over-track building construction has the advantage of comprehensive utilization of land resources, ease of commuting to work, and provide funds for subway construction. But the high frequency of subway operations into and out of the depots can generate excessive vibrations that transmit into the over track buildings, radiate noise within the buildings, hamper the operation of vibration sensitive equipment, and adversely affect the living quality of the building occupants. Field measurements of vibration during subway operations were conducted at Shenzhen, China, a city of 10.62 million people in southern China. Considering the metro depot train testing line and throat area train lines were the main vibration sources, vibration data were captured in five measurement setups. The train-induced vibrations were obtained and compared with limitation of FTA criteria. The structure-radiated noise was calculated using measured vibration levels. The vertical vibration energy directly passed through the columns on both sides of track into the platform, amplifying vibration on the platform by up to 6 dB greater than ground levels at testing line area. Vibration amplification around the natural frequency in the vertical direction of over-track building made the peak values of indoor floor vibration about 16 dB greater than outdoor platform vibration. We recommend to carefully examining design of new over-track buildings within 40 m on the platform over the throat area to avoid excessive vertical vibrations and noise. For both buildings, the measured vertical vibrations were less than the FTA limit. However, it is demonstrated that the traffic-induced high-frequency noise has the potential to annoy occupants on the upper floors. - Highlights: • Train-induced vibrations in the metro depot and over-track buildings were measured and studied. • Building train-induced vibrations were amplified around the vertical natural frequency. • Building train-induced vibrations over throat area can potentially exceed the FTA limits within 40 m. • Traffic-induced high-frequency noise has the potential to annoy occupants on upper floors.
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S0048-9697(16)32146-5; Available from http://dx.doi.org/10.1016/j.scitotenv.2016.09.216; Copyright (c) 2016 Elsevier Science B.V., Amsterdam, The Netherlands, All rights reserved.; Country of input: International Atomic Energy Agency (IAEA)
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