摘要
路基动应力的概率分布特征是路基极限状态法设计的基础。本文利用列车-板式轨道-路基耦合三维动力有限元模型,研究了高速列车在德国低干扰谱下以3种典型速度运行时路基动应力的概率分布特征,给出了路基动应力的均值及变异系数沿深度方向的分布,讨论了列车运行速度对均值及变异系数的影响。最后根据柯尔莫哥洛夫检验方法,对路基动应力进行了正态性验证,发现列车运行时各个路基深度处的动应力均服从正态分布。本文获得的动应力概率分布特征可为路基累积沉降的可靠度分析提供基础。
The probability distribution of dynamic stress is the main factor of the limit state design of the sub- grade. In this paper, a 3D finite element model for vehicle-slab track-subgrade was built, realizing the probability statistics of dynamic stress of subgrade with high speed trains running under German low interference spectrum with three typical speeds. Based on the probability statistics, the mean values and the distribution of vari- ation coefficients of dynamic stress amplitude along the depth of the subgrade were given. Additionally, the in- fluence of train speed on the mean values and variation coefficients was analyzed. Finally, the normal distribu- tion of dynamic tress amplitude was verified by the Kolmogorov rule. The dynamic stress at each subgrade depth during train operation was found to follow the normal distribution. The probability distribution character-istics of the dynamic stress obtained in this paper can serve as a basis for the reliability analysis of the accumu- lated settlement of the subgrade.
出处
《铁道学报》
EI
CAS
CSCD
北大核心
2016年第9期86-91,共6页
Journal of the China Railway Society
基金
国家自然科学基金(U1234204
51225804
41472244)
中国铁路总公司科技研究开发计划(2014G003-B)
关键词
三维动力有限元模型
概率统计
路基动应力
不平顺谱
3D finite element dynamic model
probability statistics
dynamic stress of subgrade
irregularity spectrum
