温度荷载作用下高速铁路无砟轨道伤损反演分析
Inversion analysis of damage of ballastless track in high-speed railway under temperature loads

基于混凝土塑性损伤模型，采用Abaqus软件，以CRTS-I型板式无砟轨道为例，对温度荷载长期作用下结构伤损产生的全过程进行计算机反演模拟，以重现伤损产生的过程及变化规律。计算结果表明：在温度荷载重复作用下，CRTS-I型板式无砟轨道首先会在钢筋卯穴、承轨台及限位孔等处所及其周边出现伤损；随着温度荷载循环次数的累积，钢筋卯穴处伤损将向内部扩展并加深，承轨台处伤损将向周围和下方扩展并加深，限位孔处伤损将向其周围扩展并加深；上述计算机反演结果与现场实际情况基本一致。本文方法与结果对施工及养护维修具有一定理论指导作用。
Based on concrete damaged plasticity model in Abaqus, this paper simulates the process of long-term temperature load damage of CRTS-I type slab ballastless track. Simulation result shows that under the cycling temperature load, damage first appears around rebar anchors, convexes and under the fasteners. With the cycles are accumulated, the damage is expanded and deepened. The computer inversion phenomenon fits the result in-site. The method and results could be the guidance for construction and maintenance