摘要
为研究重载铁路简支梁桥上无缝线路纵向力分布规律,以及墩顶纵向刚度限值等关键参数的影响,建立了30t轴重重载铁路简支T梁-有砟轨道一体化空间有限元模型,研究温度和活载作用下30t轴重重载铁路简支梁桥上无缝线路纵向力和墩台水平力分布规律,并与普通铁路进行对比;探讨简支梁跨数和布置方式、制动力和挠曲力组合方式对梁轨系统受力特性的影响,提出重载铁路常见跨度简支梁桥墩顶纵向线刚度限值。研究表明：当下部结构刚度相差不大时,多跨简支梁桥可按8跨简化建模;重载铁路简支梁桥上无缝线路纵向力比普通铁路大约10%~31%;简支梁不等跨布置时,墩台挠曲力差异最大达49%;考虑列车竖向活载和制动耦合作用时,墩台水平力比传统的代数求和检算方法偏大22%;建议30t重载铁路双线24m、32m、40m和48m简支梁桥墩顶纵向水平线刚度限值分别为600k N/cm、800k N/cm、1000k N/cm和1200k N/cm。
In order to investigate heavy haul rails CWR longitudinal force distribution laws and the influence of key parameters such as support stiffness limits, a CWR analytical model of T-shaped simply-supported bridge with ballast track has been established. Based on the above model under the combined effect of temperature and live load, distribution laws of longitudinal force and pier tops＇ horizontal force have been analyzed and compared with normal rail traffic as well. The influences of the span numbers and static arrangements have been investigated; the different compound modes of forces due to braking, acceleration and bending of the deck have been compared, and the limiting values of longitudinal stiffness at bearings have been put forward. The research shows that, when difference of substructure stiffness is not significant, the multi-span simply supported bridge modeling could be simplified to 8 spans, the longitudinal force of heavy haul railway is greater than normal rail traffic by 10% -31% , when static arrangement is in equality difference of pier top force due to bending of the deck is maximum up to 49%, considering the live load and braking force pier top horizontal force is 22% larger than the traditional algebraic sum method, for heavy haul double track 24m, 32m, 40m and 48m simply-supported bridges the recommended limits of longitudinal stiffness at bearings should not be less than 600kN/cm, 800kN/cm, 1000kN/cm and 1200kN/cm.
出处
《土木工程学报》
EI
CSCD
北大核心
2015年第8期60-69,共10页
China Civil Engineering Journal
基金
国家自然科学基金(51378503)
高速铁路基础研究联合基金(U1334203)
中国博士后科学基金(2014M552158)
关键词
桥梁工程
轨道工程
简支梁
30t轴重
重载铁路
bridge engineering
railway engineering
simply-supported bridge
30t axle load
heavy haul railway
