Coupling Vibration Analysis Of Vehicle-Track-Bridge In High-speed Railway

As the speed increasing of trains and bridge structure are employed in the high-speedrailway, more and more attentions are paid in the study of the dynamic interaction betweentrains and bridges. Paritcularly, great efforts have been devoted to analysising thevehicle-bridge coupling theory and phenomena when the vehicle crosses bridges forevaluating the built bridge’s function and optimizing the design of the newly built bridge.In this thesis, a dynamic model for the vibration analysis of the high speedvehicle-ballastless track-bridge coupled system, which is about slab track, is established basedon the principle of unchanged value of the total dynamic potential energy of elastic systemand the “right position” rule. A corresponding program was developed on the platform ofFortran PowerStation4.0by FORTRAN. With the excitation of irregularities of rail, thesimulation computation of vibration response was carried out. The main works in this thesisare listed as follow:1. Establishment of a more completed dynamic analysis model for vehicle.The four-axlerolling stock with two stage suspension is used for the study and a space vibration analysismodel constituting of such rigid bodies as carbody, bogie frame and wheelset is built.Thereare totally21degree of freedom i.e,5for the carbody, that is horizontal movement, bounce,roll and yaw.4for the bogie frame is horizontal movement, bounce, and yaw.2for thewheelset is horizontal movement and bounce.2. The bridge structure’s equation of motion is established by finite-element method.Based on the principle of unchanged value of the total dynamic potential energy of elasticsystem, the vehicle-bridge spatial coupling vibration analysis model was developed.3. With the Xijiang Bridge of Guangzhu railway project as the engineering background,the dynamic reponses of a long-span continuous beam bridge under6vehicles transverse atdifferent speeds and different rail irregularities were computed.4. With the Kuafokai Bridge of Guangzhu railway project as the engineering background,the dynamic reponses of a long-span basket handle arch bridge under6vehicles transverse atdifferent speeds and different rail irregularities were computed.I hope these conclusions have significance and reference value in use for bridge design,dynamic performance assessment of the bridge, bridge reinforcement and the trainspeed-increasing.