中美桥上无砟轨道设计荷载计算方法对比研究  

Comparative Study on Calculation Methods for Design Loads of Ballastless Tracks on Bridges Based on Chinese and American Standards

作　　者：代丰 林红松[1] 杨文茂[1] 徐浩[1] DAI Feng;LIN Hongsong;YANG Wenmao;XU Hao(China Railway Eryuan Engineering Group Co.,Ltd.,Chengdu 610031,China)

机构地区：[1]中铁二院工程集团有限责任公司,成都610031

出　　处：《高速铁路技术》2023年第3期43-47,共5页High Speed Railway Technology

基　　金：中铁二院工程集团有限责任公司科学技术研究计划(KYY2019032(19-22))。

摘　　要：为顺应中国铁路“走出去”的发展需求,通过对比中美规范规定的桥上无砟轨道结构设计荷载计算方法,以国际工程项目为背景,分析了2种规范计算方法及应用效果差异,提出了混凝土梁桥上无砟轨道结构设计荷载AASHTO/ACI计算方法,研究结果表明:(1)AASHTO/ACI混凝土梁结构设计应满足系数加乘的极限状态荷载效应组合,极限状态分强度极限状态、极端事件极限状态、使用极限状态、疲劳极限状态4种;(2)AASHTO/ACI桥上无砟轨道结构设计荷载一般情况应考虑恒载、竖向标准车辆荷载、摇摆力、离心力、纵向力、倾覆力、风载、梁轨相互作用力、地震荷载、脱轨荷载及断轨力,根据荷载方向确定各向设计荷载组合;(3)AASHTO/ACI混凝土梁结构设计规范较中国铁路轨道设计规范考虑的桥上无砟轨道结构设计荷载种类更细化,设计荷载计算值更小,采用中国铁路轨道设计规范确定桥上无砟轨道结构设计荷载偏保守。In order to meet the needs of“Going Global”of Chinese railways,by comparing the calculation methods for design loads of ballastless track structures on bridges stipulated in Chinese and American standards,and taking the international engineering projects implemented as the background,the differences in the calculation methods and application effects of the two standards were analyzed,and the calculation method for design loads of ballastless track structures on concrete girder bridges based on AASHTO/ACI was proposed.The results of the study show that:(1)The design of the concrete girder structure based on AASHTO/ACI shall satisfy the limit state load effect combination multiplied by a coefficient,and the limit state includes 4 types,namely strength limit state,extreme event limit state,serviceability limit state and fatigue limit state.(2)Generally,the design loads of ballastless track structures on bridges based on AASHTO/ACI include dead load,vertical standard vehicle load,swaying force,centrifugal force,longitudinal force,overturning force,wind load,girder-rail interaction force,seismic load,derailment load and rail breaking force,and the design load combination in each direction shall be determined according to the load direction.(3)The design load categories for ballastless tracks on bridges specified in AASHTO/ACI are more detailed than those in the Chinese railway track design standards,and the calculated values of the design loads are smaller.It is more conservative to use the Chinese railway track design standards to determine the design loads of ballastless tracks on bridges.

关 键 词：AASHTO 无砟轨道 桥梁 极限状态法 设计荷载 

分 类 号：U213.44[交通运输工程—道路与铁道工程]