Study of the train-induced vibration impact on a historic Bell Tower above two spatially overlapping metro lines |
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| Institution: | 1. University of Porto, Faculty of Engineering, Porto, Portugal;2. Polytechnic Institute of Porto, Porto, Portugal;3. University of La Coruña, Campus de Elviña, La Coruña, Spain;1. Institute for Infrastructure and Environment, Heriot Watt University, Edinburgh, UK;2. Department of Theoretical Mechanics, Dynamics and Vibrations, University of Mons, Mons, Belgium |
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| Abstract: | There is concern regarding the long-term vibration effects caused by metro trains on historic buildings. In this paper, the impact of metro train-induced vibrations on the Bell Tower in Xi’an above two spatially overlapping tunnels was studied.Metro Line 2 has been operational since 2011, and Line 6 is still under construction. To study and control the effect of micro vibrations on the Bell Tower, a metro train–track–tunnel–soil 3D dynamic FE model was developed. The vibration response generated by Line 2 was then predicted, and the influences of train speed on ground vibration were analysed. In addition, a detailed in situ measurement, which helped calibrate the numerical model and determine the dynamic behaviour of timber structures, was performed. Finally, the calibrated models and measured results were used to predict vibrations caused by road traffic and trains from two spatially overlapping metro lines. This was performed under different route schemes and train operation conditions.The results showed that installing steel spring floating slab tracks (FST) and decreasing train speeds had obvious effects on controlling the ground peak particle velocity (PPV). Simulated results from both the input impulse and output response generated by metro Line 2 matched well with actual measurements. If correct designs are employed, it is possible to resolve the vibration problem on historic buildings caused by metro trains. |
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| Keywords: | Train vibration Metro Historic building Road traffic vibration Vibration measurement Vibration prediction |
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