Study of Metro Train-induced Vibrations on Historic Buildings in Chengdu

摘要

To protect historic buildings, there is some concern about long -term vibration influence caused by subway trains. Compared r with structural damage ,architectural damage is especially important for those which are sensitive to vibrations but with r unique artistic value. As an example ,the vibration influence to a monument caused by Chengdu Subway line 2 is analyzed. r Firstly,the allowable r. m. s velocity at the foundation of monument is derived and a site measurement was performed to get r the background vibrations induced by road traffic. In addition, a train-track coupled model and 3D tunnel-soil-structure r coupled FE models are built to predict the dynamic response of the monu -ment. Different kinds of fasteners and train speeds r are compared and discussed as well. Results show that: (1) under the train speed of 72km/h, all the traffic vibrations r exceed the low limit no matter what kind of fastener is used , which is mainly due to the contribution of road traffic. r Slowing down train speeds can cause effective vibration attenuation ; (2) vibrations go down sharply with the train speed r from 65km/h to 58km/h. When the train speed is lower than 58km/h, vibrations are lower than allowable value even if the r contribution of road traffic is considered.