高速铁路高架桥局部振动的有限元分析

针对高速铁路高架桥箱型梁局部振动问题,基于车辆-轨道耦合动力学原理,采用实体单元对梁体进行有限元分析。通过对选取的六个敏感点振动特性的研究,比较得出箱梁各部位局部振动情况。研究在不同列车速度作用下,梁体不同部位的时域与频域响应,得出随车速变化各点振动频率的分布规律。同时分析轨道状态对箱梁局部振动的影响,对比计算结果可知,轨道不平顺是引起局部振动的主要因素。此外,还分析了不同边界条件对箱梁的局部振动响应的影响,结果表明固支梁相比简支梁,顶板、腹板、底板的局部振动响应有所减弱,而对翼缘板则影响较小。

Analysis of Local Vibration for High-speed Railway Bridge by Means of Finite Element Method

Abstract：Based on the theory of vehicle track coupling dynamics, the local vibration of the high-speed railway box girder is analyzed by the Finite Element Method (FEM) and the model is simulated with the solid elements. Through the study of vibration characteristics of the selected 6 sensitive points, the local vibration out in different parts of the box girder is figured. It is compared the response of the time domain and frequency domain in different parts of the cross section on different train speeds. Furthermore, the influence of track irregularity on local vibration response is analyzed. The results show that the track irregularity is the main factor causing local vibration. At last, the effects of local vibration on the boundary conditions are discussed. The response of top panel, floor panel and web panel are different and the flange panel is similar between the simple supported beam and the fixed beam.