摘要
针对非预应力轨道板在CRTSⅢ型板式无砟轨道上的适应性开展研究,将组成复合道床板的普通钢筋混凝土轨道板与自密实混凝土层考虑为等寿命的结构层,基于极限状态法对复合道床板进行配筋设计。考虑列车荷载、温度荷载和基础变形的共同作用,确定自密实混凝土层配筋,轨道板配筋时还需考虑其在制造、运输和施工时的受力状态。计算结果表明:自密实混凝土层纵向钢筋由耐久性要求确定,横向钢筋按照最小配筋率进行配筋即可满足要求;理论计算得到的轨道板下层纵、横向钢筋还需根据构造要求进行相应调整;与现有普通钢筋混凝土轨道板对比,优化后的轨道板配筋节约18.4%,复合道床板整体配筋节约4.4%。研究结果可为普通钢筋混凝土CRTSⅢ型板式无砟轨道技术在温暖地区推广使用提供理论支撑。
The ordinary reinforced concrete track slab and the self-compacting concrete layer,which constitute composite ballastless slab,are regarded as a equal-life structural layer to study the adaptability of non-prestressed slab on CRTSⅢslab ballastless track,and the reinforcement design of the composite ballastless slab is based on the limit state method.The reinforcement of self-compacting concrete layer is determined based on the effect of train load,temperature load and foundation deformation,while designing the reinforcement of track slab,and the stress state in manufacturing,transportation and construction should also be considered in track slab reinforcement.The results show that the longitudinal reinforcement of self-compacting concrete layer is determined by the durability requirement,and the transverse reinforcement can meet the requirement according to the minimum reinforcement ratio;the longitudinal and transverse reinforcement lower layer of the track slab calculated by theory need to be adjusted correspondingly according to the structural requirements;compared with the existing ordinary reinforced concrete track slab,the optimized track slab reinforcement can save the reinforcement by 18.4%,and the composite ballastless slab reinforcement can save 4.4%.The research results can provide theoretical support for the promotion and application of ordinary reinforced concrete CRTSⅢslab ballastless track technology in warm areas.
作者
梁爽
杨荣山
张光明
黄永辉
常逢文
胡猛
LIANG Shuang;YANG Rongshan;ZHANG Guangming;HUANG Yonghui;CHANG Fengwen;HU Meng(MOE key Laboratory of High-speed Railway Engineering,Southwest Jiaotong University,Chengdu 610031,China)
出处
《铁道标准设计》
北大核心
2020年第9期10-14,共5页
Railway Standard Design
基金
国家自然科学基金项目(51778543)
中国铁路总公司科技研究开发计划课题(2017G005-E)
企事业单位委托科技项目(2018H010414)
中央高校基本科研业务费专项(2682019CX01)。
关键词
CRTSⅢ型板式无砟轨道
高速铁路
等寿命设计理念
复合道床板
极限状态法
配筋设计
CRTSⅢslab ballastless track
high-speed railway
equal life design concept
composite ballastless slab
limit state method
reinforcement design
