摘要
为了准确分析时速250 km/h客运专线32 m标准双线简支箱梁的约束扭转效应,基于箱梁约束扭转时截面变形和约束扭转微分方程,建立能够准确模拟实际边界条件的有限元数值模型。分别采用有限元法和解析法,对比分析仅在单线活载作用下箱梁约束扭转翘曲应力的大小以及变化规律。通过定义扭转翘曲系数,研究结构设计参数高跨比、高宽比和宽厚比对箱梁约束约束扭转的影响。研究结果表明:按本文方式建立的有限元方法能够有效地模拟箱梁约束扭转效应;在单线活载作用下,跨中截面翘曲系数很大,顶板与腹板交点处翘曲系数为8.94%,悬臂板端部翘曲系数最大,可达10.24%,而1/4截面翘曲系数却很小,几乎接近于0;箱梁的结构设计参数对箱梁约束扭转效应均有一定影响,总体规律是双线铁路箱梁约束扭转效应随着高跨比、高宽比和厚高比的增加而增大。
In order to calculate the restrained torsion effect of double track railway box girders with speed of 250 km/h,a finite element model that simulates the actual boundary conditions is established based on the differential equations and sectional deformation of restrained torsion of box girder.Using finite element method and the traditional analytical method,restrained torsion stress is calculated and analyzed only under single-track live load.By defining parameters of warping ratio,the rules of warping stress influenced by the design parameters of high span ratio,width high ratio and thickness to height ratio are analyzed.The results show that the finite element method can effectively simulate the restrained torsion effect of box girder.Under eccentric live load of single track,the cross section has a great warping ratio,the value of warping ratio on flange edge of top plate is 8.94%,the value of warping ratio on end of cantilever plate is 10.24%,while the warping ratio on section of 1/4 is nearly 0.The design parameters of high span ratio,width span ratio and wall thickness can all influence the restrained torsion effect of box girder.The general rule is that the torsion effect of box girder is increased with the increase of high span ratio,high width ratio and high thickness ratio.
作者
马俊军
蔺鹏臻
MA Junjun;LIN Pengzhen(Key Laboratory of Road&Bridge and Underground Engineering of Gansu Province,Lanzhou Jiaotong University,Lanzhou 730070,China;School of Civil Engineering,Lanzhou Jiaotong University,Lanzhou 730070,China)
出处
《铁道科学与工程学报》
CAS
CSCD
北大核心
2018年第10期2463-2470,共8页
Journal of Railway Science and Engineering
基金
国家自然科学基金重大资助项目(11790281)
国家自然科学基金资助项目(51878323)
中国铁路总公司科技研究开发计划项目(2017G010-C)
关键词
双线铁路
箱梁
约束扭转
翘曲应力
有限元分析
double track railway
box girder
restrained torsion
warping stress
finite element analysis
