研究目的:大跨度上承式钢管混凝土拱桥，结构受力复杂。结构形式和施工方法的选择对拱肋受力、桥 上无缝线路设计、列车行车安全性和平稳性有较大的影响。因此，本文对此进行研究探讨。
研究结论:上承式拱桥是跨越山区河流、深谷的合理桥式。通过对某线黄河特大桥上承式钢管混凝土拱 桥的设计研究,得出如下结论:（1)拱肋截面形式、拱肋横倾角及拱上建筑主梁跨度、支墩顶支座布置方式等 有关设计参数对无缝线路、车线桥动力性能影响的计算研究结果;（2)拱肋矢跨比及拱轴系数、钢管拱架设方 案、管内混凝土灌注顺序选对拱肋应力影响的研究结果;（3)形成了一整套上承式铁路拱桥设计研究的新思 路、新方法。
Research purposes ： Large span deck steel tube concrete arch bridge is very complicated in the stresses structure. The selection of structure type and construction method has great effects on the arch rib force, the design of jointless track on the bridge，the safety and stability of the train. The issues mentioned above are studied in this paper.
Research conclusions ； The deck arch bridge is suitable for crossing the mountain river and deep valley. Based on studying the design of deck steel tube concrete arch bridge, the following results are offered ： (1) The calculation results of the effect of type section of the arch rib，the crossing incline angle of arch rib，the architecture above the arch，span of the main girder, bearing arrangement method for the pier top and related parameter on the jointless track and dynamics of train，track and bridge； (2) The results of the effect of the span ratio and parameters of the arch axis, erecting method of the steel tube，the sequence of concrete casting in the steel tube on the stress of the arch rib ； (3 ) A new design concept and thoughts.
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