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由于钢箱-混凝土组合拱桥这种新型结构的出现,使得常规混凝土拱桥存在的施工安全以及结构性能等方面的问题得到了较好的克服。但在施工阶段钢箱内大方量的流态混凝土和不同的混凝土浇筑顺序对钢箱的作用尚不清楚,因此该文讨论了3种不同的流态混凝土自重荷载的简化处理方式和不同的混凝土浇筑顺序,分析了在不同简化方式和混凝土浇筑顺序下钢箱的力学行为。分析结果表明:考虑流态混凝土为具有固液双重性质的物体,即既能传递压力,又能传递摩擦力和剪力,采用这种简化方式来处理流态混凝土的自重荷载相对优异;而采用先对称浇筑两侧的满填混凝土,再对称浇筑底板混凝土,然后一次性浇筑横系梁和箱内隔板混凝土,最后一次性浇筑顶板混凝土的浇筑顺序时钢箱的力学行为更为理想。
Due to the appearance of the new structure of the steel box-concrete composite arch bridge, the problems of the construction safety and the structural performance of the conventional concrete arch bridge are well overcome. However, during the construction phase, the massive amount of fluid concrete in the steel box and the effect of different concrete pouring sequences on the steel box are not clear. Therefore, the paper discusses the simplified treatment methods of three different types of fluid concrete self-weight load and different concrete Pouring sequence, analyzed the mechanical behavior of the steel box under different simplifications and concrete pouring sequence. The results show that considering the fluidized concrete as an object with both solid and liquid properties, that is, it can transfer pressure and transmit friction and shear force. The simplified way to deal with the self-weight load of fluid concrete is relatively superior. Symmetrically pouring concrete filled with concrete on both sides, and then symmetrically pouring concrete floor, and then pouring transverse beams and concrete box partition, the last cast steel roofing concrete pouring sequence mechanical behavior of the box is more ideal.