基于极限状态法的板式无砟轨道结构检算与优化  

Structural Checking and Optimization of Slab Ballastless Track Based on Limit State Method

作　　者：岳朝阳 赵坪锐[1] 江万红[2] 李秋义 YUE Zhaoyang;ZHAO Pingrui;JIANG Wanhong;LI Qiuyi(School of Civil Engineering,Southwest Jiaotong University,Chengdu 610031,China;China Railway Eryuan Engineering Group Co.Ltd.,Chengdu 610031,China;Hubei Key Laboratory of Railway Track Safety Service,Wuhan 430063,China)

机构地区：[1]西南交通大学土木工程学院,成都610031 [2]中国中铁二院工程集团有限责任公司,成都610031 [3]铁路轨道安全服役湖北省重点实验室,武汉430063

出　　处：《铁道建筑》2022年第3期21-25,共5页Railway Engineering

基　　金：国家自然科学基金(51978584,51678506);中铁二院科学技术研究计划[KYY2019138(19-20)];中铁第四勘察设计院集团有限公司科研重点课题(2020K156)。

摘　　要：以CRTSⅠ型板式无砟轨道为对象,根据Q/CR 9130—2018《铁路轨道设计规范(极限状态法)》计算了路基上预应力混凝土轨道板在列车荷载、温度梯度和不均匀沉降作用下的荷载效应,进行了承载能力极限状态与正常使用极限状态的检算与优化。结果表明:承载能力极限状态下,纵向正、负弯矩受偶然组合控制,横向正、负弯矩受基本组合控制,既有结构的正截面承载力满足规范要求;根据正常使用极限状态下标准组合检算结果,既有结构混凝土边缘拉应力满足规范要求;根据检算结果对纵向、横向预应力配筋数量进行了优化,横向配筋最大优化量可达37.5%。Taking CRTSⅠ slab ballastless track as the object,the load effect of prestressed concrete track slab on subgrade under train load,temperature gradient and uneven settlement was calculated according to Q/CR 9130—2018Design Code for Railway Track(Limit State Method),and the bearing capacity limit state and normal service limit state were checked and optimized. The results show that in the limit state of bearing capacity,the longitudinal positive and negative bending moments are controlled by accidental combination,and the transverse positive and negative bending moments are controlled by basic combination. The positive section bearing capacity of the existing structure meets the requirements of the code. According to the checking results of standard combination under the limit state of normal service,the tensile stress at the edge of the existing structure concrete meets the requirements of the specification.According to the checking results,the number of longitudinal and transverse prestressed reinforcement is optimized,and the maximum optimization amount of transverse reinforcement can reach 37.5%.

关 键 词：高速铁路 极限状态法 板式轨道 结构检算 预应力配筋 

分 类 号：U213.211[交通运输工程—道路与铁道工程]