摘要
通过建立(72+128+72)m高速铁路大跨度连续刚构桥-轨道系统模型,研究梁、墩单独存在温度梯度时系统受力变形特征,比较梁墩同时存在温度梯度与单独存在温度梯度对系统受力变形影响的区别,分析温度梯度幅度对系统受力变形特性影响。研究表明:梁体竖向温度梯度增大会引起钢轨受力变形及桥墩受力增加;温差由20℃增加到40℃时,钢轨与桥墩受力变形增大约2倍;梁体及桥墩同时存在温度梯度时并未改变钢轨应力的分布特征,峰值出现位置不变;梁墩同时存在温度梯度引起的墩顶弯矩和墩顶水平力与梁体和桥墩单独存在温度梯度引起的力具有代数的加减关系。
Based on a simulation model for (72 +128 +72)m large-span continuous rigid-frame bridge and track system,it was researched about system stress and deformation properties according to temperature gradient in beam vertical direction,pier vertical and horizontal direction.The comparisons were carried out on stress and deformation properties of the action of temperature gradient mentioned above alone with combination.The study showed that the rail deformed and the force of pier increased with the increase of the vertical temperature gradient of the beam.When the temperature difference was increased from 20 ℃ to 40 ℃,the rail and pier were subject to a deformation of about 2 times.When the beam and the pier had a temperature gradient at the same time,the distribution characteristics of the rail stress were not changed,and the peak position was unchanged.There were addition-subtraction relation with algebra of pier top bending moment and pier top horizontal force caused by beam and pier had temperature gradient at the same time and beam and pier had separate temperature gradients.
作者
李慧
Li Hui(China Railway 16th Bureau Group 5th Engineering Co.Ltd.,Tangshan Hebei 064000,China)
出处
《铁道建筑技术》
2019年第1期58-61,88,共5页
Railway Construction Technology
基金
中铁十六局集团有限公司科技研发计划项目(K2013-9B)
关键词
轨道工程
连续刚构桥
梁轨相互作用
温度梯度
rail engineering
continuous rigid-frame bridge
beam and track interaction
temperature gradient
作者简介
李慧(1974-),男,河北涞水人,高级工程师,主要从事桥梁工程方面的工作;E-mail:593081018@qq.com.
