铁道科学与工程学报2018，Vol.15Issue(1)：110-117,8.
铁路双线箱梁的约束扭转效应研究
Restrained torsion effect research of double track railway box girder
摘要
Abstract
In order to analyze restrained torsion effect of double track railway box girders, the restrained torsion internal force equation were established under only single track live load based on initial parameter method. Restrained torsion stress was calculated under only single track special live load. By the parameter of warping ratio, warping normal stress ratio and shearing ratio, the rules of restrained torsion stress influenced by calculation parameters of high span ratio, width span ratio, high width ratio, wall thickness and the length of cantilever flanges were analyzed. The results showed that the maximum of restrained torsion warping normal stress and shearing stress appears in the load cross section under eccentric live load of single track, while free torsion shearing stress appears in section of beam end. In the load cross section, the value of warping ratio on the intersection of the web and the top plate is 10.13%, while it is 11.9% on flange edge of top plate. The parameter of warping is increased with increase of high span ratio and width span ratio, while it is decreased with increase of the high width ratio and wall thickness. The parameter of shearing ratio is decreased with increased of wall thickness. The length of cantilever flanges have obvious influence on distribution of warping normal stress in cross section. In the process of torsion effect analysis, the contribution of the cantilever plate cannot be ignored.关键词
铁路箱梁/约束扭转/翘曲应力/初参数Key words
Railway box girder/restrained torsion/warping stress/initial parameter分类
交通工程引用本文复制引用
施成,蔺鹏臻..铁路双线箱梁的约束扭转效应研究[J].铁道科学与工程学报,2018,15(1):110-117,8.基金项目
国家自然科学基金资助项目(11790281) （11790281）
中国铁路总公司科技研究开发计划课题资助项目(2017G0101-C) （2017G0101-C）
兰州交通大学优秀平台资助项目 （）
