摘要
为简化城轨交通钢箱梁桥面板疲劳性能评估,基于轨下开口肋正交异性钢桥面板典型构造,采用有限元方法提出其疲劳应力计算组合系数法。首先,建立重庆嘉华轨道专用桥桥面构造有限元模型,确定车辆疲劳荷载纵、横向影响范围及最不利加载位置,并分析减震垫刚度、轨下纵梁刚度和轨枕板形式等关键参数对开口肋正交异性钢桥面板疲劳应力的影响。然后,根据工程实际,确定城轨交通桥正交异性钢桥面板基准结构及各设计参数变化范围,基于上述有限元模型对顶板厚度,板肋厚度和间距,横隔板间距、高度和厚度及开孔半径进行分析,得到各参数影响系数并提出轨下开口肋正交异性钢桥面板疲劳应力计算组合系数法。最后,用算例验证该方法的合理性和可靠性,计算误差在10%以内,可为疲劳设计提供参考。
To simplify the evaluation of fatigue in urban rail transit steel box girders with open-ribbed orthotropic steel decks(OSDs),a fatigue stress calculation combinatorial coefficient method is proposed using finite element analysis.Firstly,the finite element model of the Chongqing Jiahua rail transit bridge was utilized to determine the longitudinal and lateral extent of the influence zone for vehicle fatigue loading,along with identifying the position of maximum load intensity.The influence of the damping pad and the longitudinal stringer stiffness,along with the rail sleeper form on the fatigue stress of open-ribbed OSDs was also investigated.Subsequently,based on the realities of projects,the benchmark structure of orthotropic anisotropic steel bridge panels for urban rail transit bridges and the range of variation of each design parameter were determined.Then,by using the above finite element analysis,a parameter analysis was performed according to the ranges of deck thicknesses,rib thicknesses,and spacings,as well as transverse rib thicknesses,spacings,heights,and cutout radiuses.The influence coefficients of these parameters were determined and a combinatorial coefficient method of fatigue stress calculation for open-ribbed OSDs under rail transit loads was proposed.Finally,the rationality and reliability of the method were verified through numerical examples,with calculation errors within 10%,providing a reference for fatigue design.
作者
段熹
马兴龙
叶华文
潘威洲
徐勋
DUAN Xi;MA Xinglong;YE Huawen;PAN Weizhou;XU Xun(School of Architectural Engineering,Neijiang Normal University,Neijiang Sichuan 641112,China;Sichuan Provincial Highway Institute Engineering Supervision Co.,Ltd.,Chengdu Sichuan 610000,China;School of Civil Engineering,Southwest Jiaotong University,Chengdu Sichuan 610031,China)
出处
《现代城市轨道交通》
2024年第4期68-75,共8页
Modern Urban Transit
基金
国家自然科学基金(51208430,52278219)。
关键词
城市轨道交通
桥梁
组合系数法
有限元分析
正交异性钢桥面板
开口肋
疲劳应力
railway bridge
combinatorial coefficient method
finite element analysis
orthotropic anisotropic steel bridge panels
open-ribbed
fatigue stress
