Research purposes: For the purpose of guiding structure optimization design and safety evaluation, the dynamic response of high-speed railway sound barrier is studied by field test. The dynamic behavior of the main components, such as the column and the unit plate, is identified by analyzing the transmission of dynamic action. Further, a nonlinear dynamic analysis model of high-speed railway sound barrier is proposed and the vibration mechanism is revealed. By discussing the stiffness of plate-column connection and frequency response characteristic of sound barrier, the suggestions are proposed for dynamic performance improvement.
Research conclusions: (1)The sound barrier presents nonlinear vibration characteristics under the aerodynamic load of the train. The column and the unit plates are dominated by bending vibration and rigid body motion respectively.(2)The proposed structural dynamic model can reveal the mechanism of nonlinear vibration. The theoretical analysis is basically consistent with the field measurement results.(3)The stiffness of plate-column connection is a key parameter to characterize the constraint state of the unit plate and affect the dynamic response of the structure. It is suggested to add the control requirements of plate-column connection stiffness.(4)The proposed dynamic analysis method is suitable for performance optimization and evaluation of sound barrier.
Key words
high speed railway /
dynamic characteristic /
field test and theoretical study /
sound barrier /
kinetics mechanism
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