研究目的：以新建武汉至孝感城际铁路重点工程府河特大桥为例，对曲线半径500 m的32 m双线无砟 轨道现浇简支弯梁的结构形式、受力特点、倾覆稳定性及工程数量进行详细地设计与研究，通过平面与空间分 析比较，验证32 m简支弯梁的分析方法的可靠性，为同类型桥梁设计提供参考。 研究结论：( 1)计算结果表明32 m简支弯梁各项指标满足规范要求，结构安全可靠;（2)简支弯梁的结构 计算采用直线梁模型偏不安全，应采用曲线梁模型并考虑强度安全系数稍留富余'（3)“弯扭耦合”效应导致 简支弯梁曲线内外侧受力不等，箱梁底板外侧压应力较小且控制设计，除此之外，受力特点与直线梁并无太大 差异;（4)支座布置不影响简支弯梁的内力分配，本梁横向有整体外移的趋势；（5)简支弯梁腹板尺寸可与相 邻直线梁尺寸保持一致，不需增大腹板尺寸;（6)弯梁梁长较长，二恒较大，梁部工程数量较直线梁稍大，但均 在合理范围之内，工程造价经济；（7)该梁型可广泛运用于同类型城际铁路，研究方法和结论可为其他简支弯 梁设计 与借鉴 。

Research purposes： Take the key project of Wuhan - Xiaogan Intercity Railway focused on the Fuhe river super large bridge as an example，the detailed design and research were made and done on the structural form， load bearing characteristics，overturning stability and engineering quantity of 32 m double – track ballastless track cast - in - situ simply - supported curved beam located in the range of curve radius 500 m. Through the comparison and analysis of the plane and space，the reliability of the analysis method of 32 m simply - supported curved beam is verified，and some conclusions for the design of curved beam are drawn. Research conclusions： (1)The results shows that，all the indexes of 32 m simply - supported curved beam can meet the specification requirements. The structure is safe and reliable. (2) The simply - supported curved beam is not safe to use straight beam model，the curved beam model should be used to calculate and the strength safety factor should be considered slightly to stay rich. (3) The bending - torsion coupling causes the inner side force and outer side force of simply - supported curved beam to be unequal，the outer side compressive stress of box girder bottom slab is smaller and there is no great difference in the stress characteristics between the curved beam and the straight beam. (4) The bearing arrangement does not affect the internal force distribution of simply - supported curved beam，the beamhas a tendency to move to the outside in the transverse direction. (5 ) Simply - supported curved beam web site can be consistent with the adjacent straight beam size，the web size will not increase. (6) The curved beam length is longer and the secondary dead load is larger. The engineering quantity of the beam is also slightly more than the straight beam，but the increment is in the reasonable scope，the project cost is economical. (7) The beam type can be widely used in the same type of intercity railway，the research methods and conclusions can provide reference for other simply - supported curved beam design.