通过对预应力混凝土箱涵的理论分析,得出预应力筋的布置形式及计算公式,并对预应力箱涵的顶、底板正截面承载力、预应力荷载的分项系数、端部承压的截面尺寸、局部承压承载力进行理论分析,给出挠度验算公式及方法,最后对预应力混凝土箱涵进行对比设计计算,结果表明,预应力能有效防止混凝土出现拉应力,并可节省混凝土用量约70%。 Through the theoretical analysis of the prestressed concrete box culvert, the arrangement form and calculation formula of the prestressed tendons are obtained, and the bearing capacity of the top and bottom of the prestressed box culvert, the partial coefficient of the prestressed load, The results show that the prestressing can effectively prevent the tensile stress of concrete and save the concrete The amount of about 70%.