The Influence Of Creep-Shrinkage And Temperature Effect On Coupled Vibration Of Low-Medium Speed Maglev Long-Span Continuous Bridge Train-Bridge System

With the development of economy and the rapid development of China’s urbanization process, the available space within the city increasingly scarce. Maglev transport has been born with many advantages, including:low vibration, low noise, low radiation, low cost, good environmental adaptability, etc. Taking into account the characteristics of urban transport, the development prospects of the future market maglev train system is bound to very broad. China is actively involved in the research of maglev train technology, Beijing has began to build low-speed maglev transportation S1 Line in 2010, Changsha also has built the first low-speed maglev operational line which has independent intellectual property rights in 2015.This thesis is based on this background, actively pursued for low-speed maglev train-vertical vibration of coupled bridge system.In this thesis, the (85+110+85)m continuous beam of Changsha low-speed maglev transportation is taking for the example. Based on maglev train-bridge coupled vibration theory and model, comparing the result of coupled vibration response analysis and the result of field test. At the same time, calculating the deformation of Long-span continuous beams which causing by creep-shrinkage and temperature change. Study on the influence of creep and shrinkage temperature deformation cause on the large-span continuous beam maglev vehicle-bridge coupling vibration. The main conclusions are as follows:1. Based on vehicle dynamics, bridges structural dynamics, electromagnetic theory and modern control theory, a low-speed maglev train-bridge coupling vibration theory and analysis model is established, simulation software IMVB is compiled. The model and software reliability is verified through the actual vehicle test site for the trial operation of a low-speed maglev line 20m simply supported beam.2. The (85+110+85)m span continuous beam structure of Changsha low-speed maglev, fundamental frequency and dynamic response of bridge structures, vehicles, suspension clearance and electromagnetic force all meet the "Maglev Transportation Engineering Changsha Interim Provisions" requirement.3. The bridge deformation gradually increase over time under the influence of shrinkage and creep; By considering Shrinkage and creep deformation, the bridge dynamic response, vehicle dynamic response, suspension frame dynamic response, the electromagnetic force, levitation gap increased with the vehicle speed increases, the trend is consistent without considering Shrinkage and creep deformation.The bridge deck deformation incause by Shrinkage and creep have less affected on the vertical dynamic response, but have greater impact on the vehicle vertical dynamic displacement and suspension frame vertical dynamic response.4. By considering temperature deformation, the bridge dynamic response, vehicle dynamic response, the electromagnetic force, levitation gap increased with the vehicle speed increases, the trend is consistent without considering temperature deformation. At the same time, the influence of domestic and international norms temperature deformation are different, but the trend is similar.