简支斜板的车—桥耦合振动分析

Vibrating frequencies and vehicle-bridge vibration of simply-supported skewed slab

利用Ansys计算了简支斜板桥不同斜度时的自振频率,分析了基频系数和前5阶频率随斜度的变化.用薄板单元模拟简支斜板桥,用移动质量模型模拟车辆,建立了车—桥耦合振动分析方法,分别考察了斜度、车辆速度及车辆行驶方式对斜板桥挠度和弯矩冲击系数的影响,得出了斜板桥冲击系数随斜度、车辆速度及车辆行驶方式的变化规律,得到了基频随斜度的增大而增大、冲击系数与车辆速度没有单调递增或递减规律及不同截面位置的挠度和弯矩冲击系数不同等结论.

Using ANSYS software, the vibrating frequencies of simply supported skewed slab were calculated, fundamental frequency parameters and the first 5-order frequencies with different skew angles were analyzed. The skewed slab was meshed by thin plate el- ement, the vehicle was modeled as moving mass, the vehicle-bridge coupling vibrating system was introduced to establish the analytical method. The influences of skew angle, vehicle velocity, and vehicle running manners on the impacting factors of deflection and moment were investigated. The changing rules of impact factors with different skew angles, vehicle velocities, and vehicle running manners were summarized. Some conclusions are obtained that the fundamental frequency augments with skew angle augmenting, there are no monotonous rules between impacting factor and vehicle velocity, the impacting factors of deflection and moment are not identical for different cross sections.