科研之友
微信
新浪微博
Facebook
分享链接
摘要
A three-dimensional FEM analytical model for train-bridge-pier-pile-soil coupled vibration system considering soil-structure interactions is built using a high-speed train car simulated by 32m long simply supported beam as example. The car was modeled as a multiple degrees of freedom system with two layer suspensions. Soil foundation data were measured on-site at the Beijing-Shanghai high-speed railway, and as part of the soil modeling, visco-elastic artificial boundary elements were employed to simulate the soil in semi-infinite domain. Contacts between train-car wheels and the underlying rails were simulated using 3D dynamic contact elements which were based on a Coulomb's contact algorithm. The influences of the underlying structures, such as piers and piles, on vehicle-bridge coupled vibrations were analyzed, and the effects of the coupled vibrations on the vibrations of the surrounding soil were studied too. The results show that the coupled vehicle-bridge vibrations are significantly influenced by nearby piers and piles. Furthermore, vertical vibration levels are found to attenuate with increasing distance to foundation, whereas attenuation of horizontal vibrations is not so obvious. The high frequency components in field vibration attenuate more rapidly than low frequency ones, therefore remote field vibrations contain dominant low frequency components. Field vibration levels do not linearly correlate with vehicle speed, but they are largely affected by their superstructure vibrations.
- 单位
