高铁大跨度连续梁桥上无砟轨道断板受力研究  

Study on broken plate force of ballastless track on high-speed railway long-span continuous beam bridge

作　　者：戴公连[1] 葛浩[1] 邱远喜 刘文硕[1] 

机构地区：[1]中南大学土木工程学院,湖南长沙410075 [2]武汉中铁大桥勘测设计院集团有限公司第二设计院,湖北武汉430050

出　　处：《华中科技大学学报（自然科学版）》2015年第9期100-104,109,共6页Journal of Huazhong University of Science and Technology(Natural Science Edition)

基　　金：国家自然科学基金资助项目(51378503);高速铁路基础研究联合基金资助项目(U1334203)

摘　　要：为探明高速铁路大跨度连续梁桥上CRTSII型板式无砟轨道断板工况下受力特性,基于梁轨相互作用原理,采用有限元软件MIDAS建立了钢轨-轨道板-底座板-梁体-桥墩空间一体化纵向力计算模型,选取跨径(60.75+3×100+60.75)m的沪昆客运专线长玉段涟水大跨连续梁桥工程实例,研究计算了断板工况下桥上各层轨道结构相对位移,以及纵向附加力的分布和传递规律.结果表明:连续梁右端处,轨道板和底座板最有可能断裂;断缝处钢轨附加拉应力最大,其值足以引起断轨;断缝处钢轨-轨道板相对位移较大,钢轨扣件将会进入塑性状态而被拉断;断缝处及连续梁固结机构处轨道板-底座板相对位移较大,位移量足以导致CA砂浆层与轨道板结合失效;断缝两侧固结机构处剪力钢筋承受附加力较大,剪力筋会被剪断;轨道结构超过70%的纵向反力由左右两侧端刺承担.To investigate the mechanics characteristic of the CRTSII slab ballastless track on the long‐span continuous beam bridge of high‐speed railway under broken board force ,using finite element software MIDAS based on the principle of the interaction between the rail and bridge ,a space inte‐grated longitudinal force calculation model of the rail‐track board‐base plate‐beam‐pier was estab‐lished ,and the large span continuous beam bridge of （60 .75＋3 ± 100＋60 .75） m of Changyu Lianshui section of Shanghai‐Kunming passenger transport line was taken as an example to calculate the distri‐bution and transmission rules of the relative displacement and longitudinal force of each layer under broken board force .The results show that the track board and bed plate are most likely fractured at the right end of continuous beam ,the incidental tensile stress at rail broken gap reaches its maximum to cause the broken rail ,the relative displacement of rail‐track board at the broken gap is large and the rail fastening will enter the plastic state and be pulled off ,the relative displacement of track board‐bed plate at the broken gap and solidification point of continuous beam will lead to cohere efficacy lose be‐tween the CA mortar layer and track plate ,the shear reinforcement of consolidation mechanism at both sides of the broken gap owns relatively large additional force and will be sheared ,and more than 70% longitudinal counter‐force of track structure is undertaken by the terminal spines at the left and right sides .

关 键 词：高速铁路 大跨度连续梁 CRTSII无砟轨道 断板工况 纵向附加力 相对位移 

分 类 号：U418.13[交通运输工程—道路与铁道工程]