中文摘要：

目的结合算例对组合梁进行研究，为相关工程应用提供参考，以期使结构截面尺寸减小，刚度增加，稳定性和耐久性增强，动力性能改善．方法以北京南站进站立交-曲线型分联为基础，使用通用有限元软件ANSYS，在ANSYS中建立了整体有限元模型，通过改变跨度分析计算，研究了跨度与整体刚度以及跨高比之间的关系．结果通过结合算例分析计算，得出了静力作用下组合梁桥的位移、设计跨高比随着跨度的变化关系．和不同跨度影响下的位移分布．结论通过分析计算得出，随着跨度的增加，位移呈非线性增长趋势，跨中转角也呈非线性增长趋势；跨高比呈先增加后减小的趋势；对于该曲线形式的组合梁，存在最优跨度，在此时结构的跨高比最大，结构的设计最为合理．

英文摘要：

The Research is about the composite girder bridge based on a construction project, and provide reference for similar construction, for reducing cross-section components size, and improve stiffness, stability, integrity of structures and dynamic ability. Based on a curved member in Beijing Nanzhan station cloverleaf junction, using general-purpose finite element software ANSYS to build the overall finite element model in ANSYS, the analysis of the relationship of span and stiffness, span and design span-high ratio was made by analyzing and calculating span changing. Through the analysis of the example, the change of displacement and design span-high ratio with the change of span in composite girder bridge under static force was obtained, and the displacement distribution under the impact of different span was obtained as well. The result indicates that with the span increasing, the displacement and the rotation in midspan show non-linear growth, and span-high ratio increases first and then decreases. There＇s an optimal span for this kind of curved com- posite girder bridge. When it is achieved, the span-high ratio gets to maximum, and the structural design is the most appropriate.