铁路曲线连续梁桥车桥耦合振动研究

以某铁路曲线连续梁桥方案为例,讨论了大跨度铁路曲线梁桥的车桥耦合振动。在对曲线梁桥车桥耦合振动的分析中,建立了具有35个自由度的铁路车辆曲线通过模型动力方程和曲线梁的动力模型及其动力方程;应用了一种基于激励非线性振动的数值方法算法,并在WINDOWS9X／2000／XP工作环境下利用POWERSTATION和 VISUAL C 完成了计算程序的编制,取得了较好的计算结果。分析中将车辆和曲线连续梁桥分为两个由非线性轮轨接触力所联系的振动子系统,通过迭代法进行求解,轨道不平顺采用在给定轨道条件下的人工模拟不平顺,在分析过程中计入了不同车速对曲线通过的车辆及曲线连续梁桥振动的影响。

VIBRATION ANALYSIS OF RAIL-WAY CONTINUOUS CURVED-GIRDER BRIDGE COUPLED WITH VEHICLES

The coupled vibration analysis of long-span rail-way curved-girder bridges and vehicles was discussed. The dynamical equations of plane curved beam were deduced. According to features of coupled vibration between bridge and vehicle, a new numerical algorithm, which is based on the nonlinear excitation, was proposed. Above all, the algorithm can decrease the iterative time without losing precision. And the software VCBID was developed based on Windows 9X/2000/XP operation system. During analyzing different speeds were taken into account. Then the rigidity and runability of the curved-bridge were evaluated, and all of these indices are agreeable with corresponding criterions.