ABSTRACT
Cable-stayed bridges have become a common structural form providing both highway and railway with a large span over rivers and highways. So the dynamic responses of cable-stayed bridges induced by moving train loads, particularly in the high-speed range, have received increasing attention in recent years. While most previous studies have focused mainly on the impact effects on the cable-stayed bridge, there were few researches considered the running performance of the train. Based on this, this paper taking the single-tower double-cable-plane cable-stayed bridge (112 + 80 + 30) m which located on the new Chinese high-speed line between Shanghai and Kunming as the research object (show in Figure 1), the dynamic interaction between high-speed trains and cable-stayed bridge were investigated. A refined nonlinear dynamic interaction model of the train-track-bridge system is developed, in which a three-dimensional multibody train with 31 Degree of freedoms (DOFs) is considered within a finite element (FE) track-bridge system. For evaluating the stability and safety of trains, a realistic nonlinear rolling contact model considering the contact loss between wheel and rail is included. In this study, track irregularities simulated in the FE model are considered as system excitation. The system motion equation is established through global mass, stiffness, and damping matrices derived by the direct stiffness method from the FE model. In numerical analysis, the dynamic responses of the bridge and the running safety indices of the train at different speeds are discussed. The results identify that the cable-stayed bridge and the ICE3 high-speed train showed satisfactory dynamic characteristics when subjected to the vibrations induced by high-speed trains. Train speed has relatively little effect on the vertical and lateral displacements of the bridge, while the acceleration responses are obviously affected by the train speed. The train riding comfort indices and running safety indices increase with the train speed and the offload factor was most sensitive to train speed. At the design speed, the high-speed train showed good running property on the bridge. Axial view of cable-stayed bridge FE model. https://s3-euw1-ap-pe-df-pch-content-public-p.s3.eu-west-1.amazonaws.com/9781315207681/cd556cd4-4dcf-4efe-8e29-56fc67b8bfbd/content/fig342_1.tif"/>
