中美桥上无砟轨道设计荷载计算方法对比研究
HIGH SPEED RAILWAY TECHNOLOGY(2023)
中铁二院
Abstract
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.
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