CRTSI型板式无砟轨道CA砂浆疲劳寿命分析

摘要

According to the structural and mechanical characteristics of CRTS-I slab ballastless track, the rail was assumed to be a beam discretely supported at points, the fastener and foundation's elasticity was assumed as springs, the track slab, CA mortar and base slab were respectively assumed as solid object. Then the finite element model of CRTS-I track slab was established. On the basis of Palmgren-Miner linear cumulative fatigue damage criterion, the life-cycle analysis method was utilized to analyze the fatigue lives of CA mortar under different train loads. Eventually, the CA mortar layer's fatigue life distribution and fatigue life values at dangerous points were acquired.%根据CRTSI型板式无砟轨道的结构特征与受力特征，将钢轨假设为点支撑梁，扣件和基础的弹性假设为弹簧，轨道板、CA砂浆和底座板分别假设为实体，建立CRTSI型板式无砟轨道的有限元模型，以Palmgren-Miner线性疲劳累计损伤准则为基础，采用全寿命分析方法对CA砂浆在不同列车荷载作用下的疲劳寿命进行分析，得到CA砂浆层的疲劳寿命分布和危险点的寿命值。