Abstract：In order to study the influences of different tracks on the medium- and high-frequency vibrations of bridge, the vehicle-track coupling model in frequency domain and the FEM model of bridge are built considering the influences of multiple wheels. The coupling model is verified based on the dynamic test of one 30m simply-supported box girder in an urban rail transit. Furthermore, based on the numerical method, the influencing rules of three tracks structures (embedded sleeper, trapezoidal sleeper and steel spring floating slab) on the medium- and high-frequency vibrations of box girder and the corresponding causes are discussed. Results show that: the natural frequency of wheel-rail system influences the peak frequency band of wheel-rail force. When the vibration frequency is lower than the natural frequency of rail-fastening system, the type of track structure affects the dynamic compliance of rail. The nature frequency of track structure determines the attenuation trend of the force transmission ratio, and the force transmission ratio can be enlarged near the nature frequency of track structure. Wheel-rail force (external reason) and the force transmission ratio (internal reason) jointly determine the forces transmitted to the box girder, thus affecting the medium- and high-frequency vibrations of the box girder. As for the vibration reduction performances of three track structures, the best is the steel spring floating slab, the second is the trapezoidal sleeper and the worst is the embedded sleeper.
王党雄 李小珍 张迅 陈桂媛 杨得旺. 轨道结构形式对箱梁中高频振动的影响研究[J]. 土木工程学报, 2017, 50(8): 68-77.
Wang Dangxiong Li Xiaozhen Zhang Xun Chen Guiyuan Yang Dewang. Study on the influences of different tracks on the medium- and high-frequency vibrations of a box girder. 土木工程学报, 2017, 50(8): 68-77.
