收缩徐变效应对铁路预应力混凝土轨枕关键尺寸影响研究  

Research on the Influence of Shrinkage and Creep Effect on Critical Dimensions of Railway Prestressed Concrete Sleepers

作　　者：尤瑞林 范佳 谭振宇 陈扬 You Ruilin;Fan Jia;Tan Zhenyu;Chen Yang(Railway Engineering Research Institution,China Academy of Railway Sciences Corporation Ltd.,Beijing 100081,China;Hebei Shouke Railway Equipment Co.,Ltd.Xingtai 054200,China)

机构地区：[1]中国铁道科学研究院集团有限公司铁道建筑研究所,北京100081 [2]河北首科铁路器材有限公司,河北邢台054200

出　　处：《石家庄铁道大学学报（自然科学版）》2020年第4期24-29,共6页Journal of Shijiazhuang Tiedao University(Natural Science Edition)

基　　金：中国铁道科学研究院科研项目(2018YJ043)。

摘　　要：结合欧洲混凝土结构设计规范,介绍了收缩徐变效应的计算方法,并以常见的预应力混凝土轨枕为例,开展了理论计算和长期跟踪测试,研究分析了收缩徐变效应对预应力混凝土轨枕关键尺寸的影响。结果表明:收缩和徐变效应2种因素对轨枕尺寸的影响较大,且影响主要在轨枕生产完成后的早期时间段,轨枕生产完成后的2个月内变形量可达到总变形量的60%以上、3 a内变形量约达到总变形量的95%,此后逐渐趋于稳定;对于我国常用预应力混凝土轨枕,按使用40 a考虑,新Ⅱ型轨枕的两承轨槽外侧底角间距最大收缩量为1.55 mm,Ⅲ型轨枕两承轨槽外侧底角间距最大收缩量为1.48 mm。室内试验的实测结果与理论计算结果变化规律基本吻合。This paper introduced the calculation method of shrinkage and creep effect based on the European concrete structure design code.Taking the commonly used prestressed concrete sleepers in China for example,theoretical calculation and long-term tracking tests were carried out.The influence of shrinkage and creep effects on the key dimensions of prestressed concrete sleepers was studied and analyzed.The research results show that shrinkage and creep effect have great influence on sleeper dimension,and the influence is mainly on the early period after completion of sleeper production.The deformation amount can reach 60%of the total deformation within two months after completion of sleeper production,and the deformation amount can reach 95%of total deformation in the early three years,and then tends to stability.For the commonly used prestressed concrete sleepers in China,the maximum shrinkage of the outer bottom angle of the new two sleeper track for the type-Ⅱsleeper is 1.55 mm,and the maximum shrinkage of the outer bottom angle of the two rail socket of the type-Ⅲsleeper is 1.48 mm.The laboratory test results are basically consistent with the theoretical results.

关 键 词：预应力混凝土 铁路轨枕 收缩效应 徐变效应 欧洲规范 试验研究 

分 类 号：U213.3[交通运输工程—道路与铁道工程]