通过开口薄壁杆件结构力学理论解及有限元实体建模两种途径,对城市轨道交通新型U形梁单线加载工况下的应力进行了分析,并考虑翘曲的影响.计算结果表明,两种方法的计算结果较为吻合,单线加载工况下的翘曲正应力占总正应力的比例较小,且考虑翘曲后单线加载工况下的总正应力小于双线加载弯曲正应力,正应力由双线控制；而考虑翘曲后单线加载工况下的剪应力超过双线加载弯曲剪应力,剪应力由单线控制,在设计时不应忽略翘曲的影响.%Stress in new U-shape Girders for urban rail transit under single line was analysed by adopting two approaches,the theoretical solution of open thin -walled frame structures and 3D finite element model. The results with consideration of warping by the two approaches coincide with each other basically. The results indicated that, while considering warping, the normal stress under single line was less than that under double line, the warping normal stress counted for a small proportion. On the contrary, the shear stress under single line exceeded that under double line, which meant that the shear stress under single line was critical during design and calculation and the warping effect should not be ignored while calculating shear stress.
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