Coupling Vibration Of Vehicle-Line-Bridge And Its Impact On Adjacent Buildings

Along with the constant development of science and technology, Our country’s transportation system has been greatly improved in scale and technology. Among all kinds of rail transit system, the running speed of the vehicle is accelerating, traffic density is increasing and capacity of vehicle weight is also constantly adding. The dynamic interaction of vehicles and structures (bridges, housing construction, etc.) gets more and more attention.Especially as our country special passenger line high-speed trains have successively been put into operation, the vehicle-line-bridge coupled vibration and its impact on surrounding environment has become a very important research subject. This paper wored on the basis of previous studies, carried out the following research work by the surport of the National Natural Science Fund "Dynamic interaction theory and the experimental research of pier-pile-soft soil foundation system under High-speed train load "(No.:50808177):1. Established a3d finite element analysis model of vehicle-line-bridge-site soil-adjacent building coupling vibration system.Through the secondary development of ANSYS software, considering the ups and downs,yaw, nodding, head shaking, rolling the five degrees of freedom for each body and bogie, and yaw, head shaking two degrees of freedom for each wheelset, building the secondary suspension system vehicle model including23degrees of freedom. Established the bridge model in considering the rail tracks and cushion layer, and through the ANSYS providing dynamic contact element, established wheel-rail dynamic contact model. On the truncate of the computational domain in the soil, using viscoelastic artificial boundary to simulate a semi-infinite soil, and establishing a five-story frame structure in the calculated soil.2.The influence of dynamic soil-structure interaction on the vehicle-line-bridge coupling vibrationSelecting high-speed railway32m simple-supported box girder bridge, considering the infulence of different parameters, like the impact of the bridge bearings, vehicle type, speed of train traffic, site soil type, and track irregularity levels of different parameters, on the vehicle-line-bridge dynamic responseimpact.3.The influence of vehicle-line-bridge coupling vibration on free field vibration propagation characteristicsEstablished a vehicle-line-bridge-site soil coupling vibration system3d finite element analysis model, and analyzed the influence of different parameters, like vehicle speed, site soil type, vehicle type and track irregularity levels, on the vibration propagation characteristics of the free field.4. The influence of vehicle-line-bridge coupling vibration on adjacent buildingsEnvironmental vibration caused by the transport system will stimulate the vibration of the adjacent buildings, which further induces the secondary vibration and noise of the interior structure and furniture. This paper analyzes the impact of the vibration source distance, site soil characteristics and track irregularity on the vibration of the building.