CRTS Ⅲ型板式无砟轨道自密实混凝土疲劳损伤初探  

Elementary exploring on fatigue damage of self-compacted concrete for CRTS Ⅲ slab-type ballastless track

作　　者：柳恒[1] 何林[2] 杨荣山[1] 

机构地区：[1]西南交通大学高速铁路线路工程教育部重点实验室,四川成都610031 [2]西南交通大学交通运输与物流学院,四川成都610031

出　　处：《铁道建筑》2013年第10期102-105,共4页Railway Engineering

摘　　要：主要讨论CRTSⅢ型板式无砟轨道自密实混凝土调整层在反复荷载作用下的疲劳损伤特性,根据自密实混凝土损伤本构关系,分析了自密实混凝土疲劳损伤演变过程和几种疲劳寿命S-N曲线。在反复荷载作用下,由于自密实混凝土某些区域存在交变应力或复杂应力区域而容易发生疲劳损伤,最后计算并验证了其疲劳损伤主要集中在自密实混凝土自身微缺陷处和调整层端部边缘处。The paper studies the fatigue damage of the self-compacting concrete filled in CRTS Ⅲ slab- type ballastless track under repetitive loading, and analyzes the fatigue process and few S-N fatigue lifespan curves based on the constitutive relation of the damage caused. Under repetitive loading, certain part of the self-compacting concrete is easily damaged due to the alternating stress or the complex stress in existence. Ultimately, careful calculation led to the root of the occurrence of the fatigue damage, namely the minor default and the edge of the adjusting layer of the self-compacting concrete itself.

关 键 词：无砟轨道 自密实混凝土 本构关系 疲劳 非线性累积损伤 

分 类 号：U213.244[交通运输工程—道路与铁道工程]