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本文提出了取消箱形连续梁中全部横隔板,利用箱内空间作行车道的双层桥式。文中主要以海拉尔大桥设计方案缩尺1:20有机玻璃模型试验的实测数据和实桥与模型的有限元空间计算成果为依据,论述了有隔扳、无隔板及加肋型三种箱型连续梁结构在偏心活载作用下弯扭效应的相对关系,从而说明加肋型双层桥的有效性和实用性。本文最后还从材料用量和桥梁使用功能上讨论了双层桥式的实用意义及其经济性。
This article proposes the elimination of all diaphragms in box-shaped continuous beams and the use of the space inside the box as a double-deck bridge. In this paper, based on the measured data of the 1:20 plexiglass model test of the Hailar Bridge Design Project and the finite element space calculation results of the real bridge and model, the three box types including the spanner, non-partitioned and ribbed type are discussed. The relative relationship between the flexural and torsional effects of the continuous beam structure under eccentric live load demonstrates the effectiveness and practicality of the stiffened double-decked bridge. In the end, the paper also discusses the practical significance and economics of the double-deck bridge from the aspects of material usage and bridge use.