无砟轨道桥梁桥面板ZK活载计算图示分析  

Graphic Analysis of ZK Live Load Calculation of Bridge Deck of Ballastless Track Bridge

作　　者：李铭伟 Li Mingwei(China Railway Design Corporation,Tianjin 300308,China)

机构地区：[1]中国铁路设计集团有限公司,天津300308

出　　处：《铁道勘察》2021年第1期77-81,共5页Railway Investigation and Surveying

摘　　要：为准确模拟高速铁路桥上无砟轨道结构传递ZK活载至桥面板上的荷载分布效应,采用Abaqus软件建立CRTSⅠ型双块式无砟轨道精细化数值分析模型,通过对底座板底面垂向应力等值线分布进行分析,开展高速铁路桥梁桥面板ZK活载计算图示的研究。研究表明,进行桥梁结构横向荷载计算或桥面板、桥面铺装等桥梁结构局部精细化受力分析时,在单轴ZK特种荷载作用下,荷载传递至桥面的计算图示可简化为顺桥向长2.0 m、横桥向宽0.7 m的矩形面荷载,均布面荷载值为90.80 kPa;在四轴ZK特种活载作用下,计算图示可简化为横桥向分布宽度为0.76 m的条状面荷载,均布面荷载值为109.20 kPa。In order to accurately simulate the load distribution effect of ZK live load transferring from ballastless track to high-speed railway bridge deck,the refined numerical analysis model of CRTSⅠ twin-block ballastless track is established by ABAQUS software,the vertical stress contour distribution on the bottom of the base is analyzed and the ZK live load calculation diagram of bridge deck of high-speed railway is studied.The research shows that,when the lateral load of bridge structure or the local fine stress of bridge deck are analyzed,under the action of uniaxial ZK special load,the calculation diagram of load transferred to bridge deck can be simplified as rectangular surface load with length of 2. 0 m along bridge direction and width of 0. 7 m in transverse direction,with uniform surface load value of 90. 80 kPa;under special live load of four axis ZK,calculation diagram can be simplified as strip surface load with transverse distribution width of0. 76 m and uniform surface load value of 109. 20 kPa.

关 键 词：高速铁路 CRTSⅠ型双块式无砟轨道 ZK活载 桥面板 荷载计算图示 

分 类 号：U238[交通运输工程—道路与铁道工程] U24