Abstract: Aiming at the straddle type monorail steel track beam structure, the stress state of the steel track beam with different types of roof stiffeners was analyzed by using the finite element analysis software ABAQUS, and the stress system of the bridge deck was deeply analyzed. Results show that the top plate of steel track beam shows obvious stress characteristics of three basic systems, and the stress of the second and third system accounts for 30%~45%. Both longitudinal and transverse stiffeners on the top plate can reduce the stress of the second and third system of the roof. The effect of longitudinal stiffeners is better than that of transverse stiffeners, but it will reduce the welding space at the top of the track beam, which makes it difficult to be manufactured. Increasing the number of transverse stiffeners can significantly reduce the stress of the top plate, which is better than increasing the thickness of stiffeners. This study provides a theoretical basis for the design of straddle monorail steel track beam with transverse stiffener structure on the top plate.

Key words: railway engineering, straddle monorail, steel track beam, finite element, stress system, top-plate stiffener

摘要： 针对跨座式单轨钢轨道梁结构，利用有限元分析软件ABAQUS，分析了采用不同类型顶板加劲肋的钢轨道梁的应力状态，并对桥面板应力体系进行了深入分析。结果表明：钢轨道梁顶板在列车轴载作用下表现出明显的三体系应力特性，其中第二、三体系应力占比为30%～45%；顶板设置纵向或横向加劲肋均能起到降低顶板第二、第三体系应力的作用；设置纵向加劲肋的效果优于横向加劲肋，但会减小轨道梁顶部焊接空间，制造加工难度大；增加横向加劲肋数量能够明显降低顶板应力，其效果优于增加加劲肋板厚；研究为顶板采用横向加劲肋构造的跨座式单轨钢轨道梁设计提供理论依据。

关键词: 铁道工程, 跨座式单轨, 钢轨道梁, 有限元, 应力体系, 顶板加劲肋