首页> 中文期刊>铁道科学与工程学报 >铁路双线箱梁的约束扭转效应研究

铁路双线箱梁的约束扭转效应研究

     

摘要

为分析铁路双线箱梁的约束扭转效应,基于初参数法建立仅在单线特种活载作用下的约束扭转内力方程.计算单线特种活载作用下的约束扭转应力分布规律.通过定义约束扭转翘曲比例系数、翘曲正应力比和剪切比例系数,研究高跨比、宽跨比、高宽比、壁厚和悬臂板长度等计算参数对约束扭转应力的影响规律.研究结果表明:单线活载偏心作用时,约束扭转翘曲正应力和约束扭转剪应力最大值在荷载作用截面,自由扭转剪应力最大值在梁端截面;荷载作用截面的顶板和腹板相交处翘曲比例系数可达10.13%,悬臂板端点翘曲比例系数可达11.9%;翘曲比例系数随着高跨比、宽跨比的增大而增大,随着高宽比、板厚的增大而减小;剪切比例系数随着高宽比的增大而减小,随着腹板厚度的增大而增大;悬臂板的长度对横截面翘曲正应力的分布有明显影响,因此在扭转效应分析中,悬臂板的贡献不可忽略.%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.

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