客货共线铁路弹性支承块式无砟轨道结构极限状态设计法研究  

Study on Limit State Design Method of Elastic Supported Block-type Ballastless for Mixed Passenger and Freight Railways

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作  者:陈潇[1] CHEN Xiao(China Railway Siyuan Survey and Design Group Co.,Ltd.,Wuhan 430063,China)

机构地区:[1]中铁第四勘察设计院集团有限公司,武汉430063

出  处:《铁道标准设计》2022年第12期6-11,共6页Railway Standard Design

基  金:中铁第四勘察设计院集团有限公司重点科研课题(2019K011,2020K022)。

摘  要:为研究客货共线弹性支承块式无砟轨道极限状态设计方法,系统分析计算模型和加载方式,开展随机变量概率模型及统计参数研究,提出弹性支承块式无砟轨道极限状态设计分项系数,并进行道床板极限状态法配筋设计。结果表明:(1)对于距洞口小于200 m地段隧道内弹性支承块式无砟轨道道床板,建议承载能力极限状态下,列车荷载和温度梯度作用分项系数分别取1.2、0.5,正常使用极限状态下分别取0.7、0.5;(2)采用极限状态法对道床板进行配筋计算,距离洞口小于200 m地段道床板纵向配筋结果与容许应力法计算配筋一致,横向上表面和下表面配筋分别减少2根和6根。In order to study the limit state design method of elastic supported block-type balastless track for mixed passenger and freight railway,the calculation model and loading mode of elastic supported block ballastless track structure of mixed passenger and freight railway are analyzed in this paper.The design partial coefficients of limit state method for elastic supported block ballastless track are put forward,and the reinforcement design of track bed slab is carried out by limit state method.The results show that:(1)For the elastic support block ballastless track bed slab in the tunnel less than 200 m away from the portal,it is recommended that the partial coefficients of train load and temperature gradient action under the limit state of bearing capacity shall be 1.2 and 0.5 respectively,and 0.7 and 0.5 under the limit state of normal use.(2)The limit state method is used to calculate the reinforcement of the track bed slab.The longitudinal reinforcement results of the track bed slab in the section less than 200 m away from the portal are consistent with those calculated by the allowable stress method.The number of reinforcement of transverse upper surface and lower surface is reduced by 2 and 6 respectively.

关 键 词:客货共线铁路 轨道 弹性支承块式无砟轨道结构 极限状态法 配筋设计 

分 类 号:U213.244[交通运输工程—道路与铁道工程] U213.4

 

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