您目前所在的位置:首页 - 期刊简介 - 详细页面

铁道科学与工程学报

JOURNAL OF RAILWAY SCIENCE AND ENGINEERING

第12卷    第5期    总第68期    2015年10月

[PDF全文下载]    [Flash在线阅读]

    

文章编号:1672-7029(2015)05-0982-08
温度荷载作用下桥上CRTSII型板式轨道纵向力学特性研究
张志超1,曾志平1,2,元强1,曾大鹏1,刘付山1

(1.中南大学土木工程学院,湖南长沙 410075;
2.高速铁路建造技术国家工程实验室,湖南长沙 410075
)

摘 要: 利用有限元软件ANSYS建立温度荷载作用下桥上CRTS II型板式无砟轨道结构体系各部件纵向相互作用分析模型。模型中钢轨、轨道板、底座板、梁体、桥墩均采用梁单元模拟,各结构层之间的连接采用弹簧单元模拟。以一座高速铁路混凝土连续梁桥为例,分析桥梁温度荷载作用下,轨道及桥梁结构的力学特性,并针对相关因素对各结构层受力与变形的影响进行了研究。研究结果表明:当梁体温升幅度达到一定值以后,轨道结构纵向力不再明显增大;“分离板模型”能更好反映CA砂浆黏结状态对轨道和桥梁受力特性的影响;滑动层摩擦大数增大,将大幅度增加轨道与桥梁结构的受力;轨道板宽接缝开裂导致钢轨、底座板纵向受力以及轨道板位移的增大。

 

关键字: CRTS II型板式无砟轨道;桥梁;温度力;位移;有限元

Study on longitudinal mechanical characteristics of CRTS II slab trackon bridge under the temperature load
ZHANG Zhichao1, ZENG Zhiping1,2, YUAN Qiang1, ZENG Dapeng1, LIU Fushan1

1. School of Civil Engineering, Central South University, Changsha 410075, China;
2. National Engineering Laboratory for High Speed Railway Construction, Changsha 410075, China

Abstract:A model to study the longitudinal mechanical characteristics of CRTS II slab track on bridge under the temperature load was established by ANSYS in this paper. The rail, slab, foundation plate, box bridge and bridge pier were simulated by beam element, while the connection between layers were simulated by spring element in the model. Taking a continuous beam bridge on high speed railway as an example, the longitudinal mechanical characteristics of track structure and bridge structure, as well as the influences of several factors on the force and displacement of each component were analyzed by virtue of the model. The results show that: (1) The longitudinal forces of track structure will no longer increase obviously when the temperature on bridge reaches a certain value. (2) “Separate Slab Model” can simulate the influence of longitudinal mechanical characteristics of track structure and bridge structure by cement emulsified asphalt mortar. (3) The force of track structure and bridge structure will increase greatly, as the friction coefficient of sliding layer increases. (4) The cracking at wide juncture will increase the force of rail and foundation plate and the displacement of slab.

 

Key words: CRTS II slab track; bridge; temperature load; displacement; finite element method

ISSN 1672-7029
CN 43-1423/U

主管:中华人民共和国教育部 主办:中南大学 中国铁道学会 承办:中南大学
湘ICP备09001153号 版权所有:《铁道科学与工程学报》编辑部
------------------------------------------------------------------------------------------
地 址:湖南省长沙市韶山南路22号 邮编:410075
电 话:0731-82655133,82656174   传真:0731-82655133   电子邮箱:jrse@mail.csu.edu.cn