近年来我国交通行业快速发展,立交系统日益完善,异形桥梁结构不断发展,现如今的规范、设计方法及对异形结构的本质分析亟待提高。针对这一问题,以典型匝道桥“人”字异形梁作为分析对象,利用ANSYS有限元软件建立空间模型,首先将异形梁与同等尺寸条件下的直梁做对比分析,结果表明,直梁的应力、挠度参数结果大于异形梁结构,异形梁的低阶频率大于直梁结果。其次,提出设计参数跨径长度、箱梁宽度及匝道半径为主要影响因素,探讨其对异形桥梁的力学性能影响。结果表明,跨径长度、匝道半径对静力学指标影响较大且规律性强,而跨径长度对动力学指标的影响远大于桥梁宽度和匝道半径,为异形桥梁的设计提供了有价值的参考。 In recent years, the rapid development of China’s transportation industry, the improvement of the interchange system, the continuous development of the special-shaped bridge structure, and now the norms, design methods and the analysis of the nature of the special needs to be improved. In order to solve this problem, the typical ramp bridge “person ” shaped beam is taken as the analysis object. The finite element software ANSYS is used to establish the spatial model. Firstly, the contrast analysis is made between the deformed beam and the straight beam under the same size. The stress and deflection parameters of the beam are larger than those of the special-shaped beam. The lower-order frequency of the special-shaped beam is larger than that of the straight beam. Secondly, the main factors influencing the mechanical properties of profiled bridges are proposed, such as span length of design parameters, width of box girder and ramp radius. The results show that the span length and the ramp radius have a great influence on the statics, and the regularity is strong. The effect of the span length on the dynamical index is much larger than the width of the bridge and the ramp, which provides a valuable reference for the design of the profiled bridge .