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应用动态时程分析理论和有限元方法,分别选取美国EI-Centro地震波(适用于二类场地)和LomaPrieta地震波(适用于三类场地),研究水平地震作用下不同半径曲线轨道和直线轨道横向变形的特点,研究不同地震烈度地震波对有砟轨道横向弯曲变形的影响规律,初步建立地震烈度和轨道横向变形程度之间的对应关系。研究结果表明,地震烈度在6度以下时,轨道无损坏或横向变形<4 mm,无需维修可使用;地震烈度达到7、8度时,轨道横向变形可能达到数厘米,需要对轨道进行检测,必要时应进行维修后运营;地震烈度>8度时,轨道变形明显增大,需对轨道进行维修或更换轨道。研究结果可为有砟轨道震后快速评估提供参考。
Using the dynamic time-history analysis theory and the finite element method, EI-Centro seismic waves (for the second type of site) and LomaPrieta seismic waves (for the three types of sites) of the United States are selected respectively to study the lateral deformation of curved orbitals and linear orbits with different radius under horizontal earthquake , The influence law of seismic waves with different seismic intensity on the transverse bending deformation of ballastless orbit is studied, and the corresponding relationship between the seismic intensity and the degree of transverse deformation of the track is preliminarily established. The results show that when the seismic intensity is below 6 degrees, the orbit will not damage or the transverse deformation will be less than 4 mm, which can be used without maintenance. When the seismic intensity reaches 7 and 8 degrees, the horizontal deformation of the track may reach several centimeters, When necessary, maintenance should be carried out after operation; earthquake intensity> 8 degrees, the rail deformation significantly increased, the need for track maintenance or replacement of orbit. The results can provide a reference for the rapid assessment of the orbit after earthquakes.