基于高周疲劳损伤本构模型的无砟轨道自密实混凝土的性能演化规律
Performance evolution of self-compacting concrete for ballastless track based on high-cycle fatigue damage constitutive model
任娟娟 1章恺尧 1许雪山 1肖源杰 2叶文龙 1邓世杰 1田晋丞3
作者信息
- 1. School of Civil Engineering,Southwest Jiaotong University,Chengdu 610031,China
- 2. School of Civil Engineering,Central South University,Changsha 410083,China
- 3. Airport Planning&Design Institute,PowerChina Kunming Engineering Co.,Ltd.,Kunming 650051,China
- 折叠
摘要
CRTS Ⅲ型板式无砟轨道自密实混凝土(SCC)填充层在列车荷载和复杂环境反复作用下易产生高周疲劳损伤.本文基于损伤-有限元全耦合技术,建立了CRTS Ⅲ型板式无砟轨道自密实混凝土疲劳损伤分析方法,探讨了列车荷载、初始劣化、板端脱粘等因素对填充层性能演化的影响.计算结果表明:全耦合方法可以揭示疲劳损伤与结构应力场的相互影响机制,弥补了传统解耦法结构应力不随损伤累积而变的局限性;列车荷载变化下,填充层在服役期内的损伤累积近似服从Miner线性准则,在初始应力水平达到0.33附近时,填充层疲劳损伤随荷载作用次数的增加出现非线性累积现象,采用全耦合法更能体现出结构的时变性;相较于自密实混凝土填充层初始劣化和列车荷载变化,板端脱粘对损伤累积的影响更为突出.
Abstract
The self-compacting concrete(SCC)filling layer of CRTS Ⅲ ballastless track is prone to high-cycle fatigue damage under repeated train loads and complex environments.Based on the technology that fully couples damage and finite elements,a fatigue damage analytical method of SCC for the CRTS Ⅲ ballastless track was established,which discussed how train load change,initial deterioration,and slab end debonding would affect the performance evolution of the filling layer.It is found that the fully-coupled method can reveal the interaction between fatigue damage and the structure's stress field.As the train load changes,the damage of the filling layer during the service period accumulates pretty much following Miner's rule in the first place.However,when the initial stress level reaches around 0.33,the fatigue damage of the filling layer presents nonlinear accumulation with the increase of loading times.Therefore,the fully-coupled method at this time can better reflect the time-varying features of the structure.Compared with initial deterioration of the SCC filling layer and the change of train loads,slab end debonding has a more prominent effect on damage accumulation.
关键词
全耦合方法/无砟轨道/自密实混凝土/疲劳损伤/材料子程序Key words
fully-coupled method/ballastless track/self-compacting concrete/fatigue damage/material subroutine引用本文复制引用
基金项目
National Key R&D Program of China(2021YFB2600900)
National Key R&D Program of China(2021YFF0502100)
National Natural Science Foundation of China(52022085)
National Natural Science Foundation of China(52278461)
Sichuan Youth Science and Technology Innovation Team,China(2022JDTD0015)
出版年
2023
NETL
NSTL
维普
万方数据