关键词: 桥梁工程, 跨座式单轨交通, 车辆-轨道梁耦合振动, 侧偏特性

Abstract: In order to study the interaction between vehicle and straddle type monorail beam, a simply-supported PC track beam of straddle type monorail line in Chongqing was taken as the research object to establish the coupled vibration model. Each car in the monorail train was idealized as a dynamic system of 15-degrees-of-freedom. The cornering characteristics of the tires were taken into consideration. Vehicle’s differential equations were derived by using Lagrange formulation. The track beam was idealized as Euler beam and its differential equations were derived by using modal synthesis method. The dynamic responses of the coupled system were studied at different running velocities, which were compared with the field-test data and the results of the model which has no cornering characteristics. The results show that a proper correlation is found and the model which considers cornering characteristics gives a more actual result. The cornering characteristics can be ignored when studying the vertical coupled vibration problem and should be taken into consideration when studying the lateral problem.

Key words: bridge engineering, straddle type monorail, coupled vibration system of vehicle and beam, cornering characteristic