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Simulation of the Impact of Mechanical Property Variability on Railway Behaviour subject to Static Loading

机译:静载荷作用下机械性能变化对铁路行为影响的模拟

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The aim of this paper is to study the influence of the spatial variability of the mechanicalrnproperties of the railway track components on the equivalent track stiffness.rnThe track is modeled using a two and a half dimensional finite element model with arnmodified plane-strain approach. Linear elastic behavior and static load are consideredrnas a first approach. Dynamic cone penetrometer test results are used in order to obtainrnclassical statistical characteristics of each substructure layer, lognormal distribution isrnthe best fit. Young’s Modulus is obtained through empirical correlations establishedrnwith the cone resistance. Two different behaviours will be considered for the supportingrnsoil, as to demonstrate the influence of the correlation function on the results. Inrnthis first approach to consider spatial variability, a squared exponential autocorrelationrnfunction is considered. Monte Carlo simulations are performed and output resultsrnshow small coefficient of variation compared to field data. The correlation length isrna key parameter in spatial variability analysis which is not yet well characterized forrnrailway materials.
机译:本文的目的是研究铁路轨道部件机械性能的空间变异性对等效轨道刚度的影响。使用二维有限元模型和改进的平面应变方法对轨道进行建模。线性弹性行为和静载荷被认为是第一种方法。使用动态锥形渗透仪测试结果来获得每个子结构层的经典统计特征,对数正态分布是最佳拟合。杨氏模量是通过与锥体阻力建立的经验相关性获得的。对于支撑土,将考虑两种不同的行为,以证明相关函数对结果的影响。在考虑空间可变性的第一种方法中,考虑了平方指数自相关函数。进行了蒙特卡洛模拟,输出结果与现场数据相比显示出较小的变异系数。在空间变异性分析中,相关长度isrna关键参数尚未被铁路材料很好地表征。

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