铁路钢桁梁桥明桥面复合轨枕宏-细观力学行为研究  

Research on Macro-meso Mechanical Behavior of Resin Sleepers on Open Deck of Railway Steel Truss Bridge

作　　者：阁军谊 肖杰灵[1,2] 武志刚 徐亚光 王平[1,2] GE Junyi;XIAO Jieling;WU Zhigang;XU Yaguang;WANG Ping(School of Civil Engineering,Southwest Jiaotong University,Chengdu 610031,China;Key Laboratory of High Speed Railway Line Engineering,Ministry of Education,Chengdu 610031,China;Track Division of China Railway Taiyuan Group Co.,Ltd.,Taiyuan 030013,China;Liupanshui Track and Telecommunication and Signal Depot,China Railway Chengdu Group Co.,Ltd.,Liupanshui 553000,China)

机构地区：[1]西南交通大学土木工程学院,成都610031 [2]西南交通大学高速铁路线路工程教育部重点实验室,成都610031 [3]中国铁路太原局集团有限公司工务部,太原030013 [4]中国铁路成都局集团有限公司六盘水工电段,贵州六盘水553000

出　　处：《铁道标准设计》2024年第2期60-67,共8页Railway Standard Design

基　　金：四川省科技计划项目(2020YFG0125);山东铁投集团科技计划项目(TTKJ2021-04);中铁第一勘察设计院集团有限公司科技开发计划项目(院科20-65)。

摘　　要：复合轨枕是明桥面结构提质改造的重要举施,但复合成型工艺及材料特性对轨枕服役性能有直接影响。针对复合轨枕明桥面结构的特性,基于ABAQUS等仿真平台,分别建立复合轨枕的宏、细观有限元模型,从多尺度仿真角度研究列车轮载下复合材料密度,纤维束直径、取向和分布等因素对轨枕承载能力及变形影响。结果表明:增大纤维束直径、使纤维束充分分散,能够减少10%~30%的轨枕受力;改变纤维取向对提高轨枕承载力的效果较为显著,优化纤维分布取向能够使轨枕表面受力减小20%~30%;在此基础上提出“45°/0°/45°”的纤维束铺层结构,采用这种结构能在相同变形量控制水平下获得更高的承载能力,较全断面纵向铺层方案提升30%~50%。研究表明:利用复合轨枕的材料特性,优化生产制造工艺可提高其承载能力。Resin sleeper is an important method to improve the quality of open deck structure,but the composite forming process and material characteristics have a direct impact on the service performance of sleepers.According to the characteristics of the open deck structure of resin sleepers,macro and micro finite element models of resin sleepers are established respectively based on ABAQUS and other simulation platforms.From the perspective of multi-scale simulation,the effects of composite material density,fiber bundle diameter,orientation and distribution on the bearing capacity and deformation of sleepers are studied.The results show that:Increasing the fiber bundle diameter and fully dispersing the fiber bundle can reduce the sleeper stress by 10%~30%;Changing the fiber orientation has a significant effect on improving the bearing capacity of sleepers.Optimizing the fiber distribution orientation can reduce the stress on the surface of sleepers by 20%~30%;On this basis,a fiber bundle layering structure of “45°/0°/45°” is proposed.With this structure,higher bearing capacity can be obtained under the same deformation control level,which is 30%~50% higher than the full section longitudinal layering scheme.The research shows that the bearing capacity of resin sleepers can be improved by making use of the material characteristics and optimizing the manufacturing process.

关 键 词：钢桁梁桥 复合轨枕 多尺度仿真 复合材料 承载能力 

分 类 号：U213.3[交通运输工程—道路与铁道工程] U448.13[建筑科学—桥梁与隧道工程]