双线铁路下承式连续梁拱组合桥列车—桥梁时变系统空间振动随机分析

Stochastic space vibration analysis of through continuous beam arch combination bridge time-varying system in double-track railroad

在列车-桥梁时变系统横向振动能量随机分析理论的基础上,采用26个自由度的列车空间振动模型,以空间梁单元模拟桥梁结构,以普通空间梁元即12自由度的空间梁元来模拟拱及吊杆结构,建立了双线铁路下承式连续梁拱组合式桥列车-桥梁时变系统空间振动分析模型,分别以构架人工蛇行波及前苏联规律性的竖向不平顺函数为横向及竖向激振源,进行双线铁路下承式连续梁拱组合式桥列车-桥梁时变系统空间振动响应分析。计算了列车以不同车速通过桥梁的空间振动响应,所得结果可供设计参考。

Based on the stochastic analysis theory of lateral vibration energy for train - bridge time - varying system, a finite element model for space vibration of the train and the through continuous beam arch combination bridge was proposed. Where the vehicle was considered as a twenty - six - freedomed multi - body system, the bridge was discretized as beam finite elements, the arch and the hangers were also discretized as beam finite elements with twelve - freedomed multi - body system. With the artificial bogie crawl wave as lateral vibration source and the irregularity function as vertical vibration source, the space vibration response were calculated when the train ran through the through continuous beam arch combination bridge at different speeds. The results provide a reference for design