The large general finite element analysis software ANSYS were employed in analysis of 30 m U-beam serviced in Chongqing rail traffic.An elaborate spatial finite element model was built,and the mechanical behaviors of static,dynamic and stability were investigated.According to the analysis,the bending-torsion coupling effect of U-beam is obvious.In addition to that,the transverse stress of U-beam can not be neglected and its torsional frequency is low,which should be paid attention in design and construction.%采用大型通用有限元分析软件ANSYS建立了重庆市轨道交通跨度30 m U型梁的三维精细有限元模型,从静力、动力和稳定性三方面进行了受力行为分析,结果表明：U型梁具有弯扭耦合效应显著、横向应力大、扭转频率低等特点,在设计和施工中应引起足够重视。
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