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本文对偏轨箱形梁桥架结构进行了初步的理论探讨和试验研究,分析了由于偏心横向集中力的作用引起梁的扭转影响,合理截面形式等问题.同时进行了大量的模型试验研究工作,并提供了设计计算资料,指出了今后有待深入研究的问题.文中得出结论:偏轨箱形梁桥架,在集中横向力作用下,主要承受弯曲,约束扭转法向应力仅为总应力的(2～8)%,并具有相当大的抗扭刚度.这种结构型式,由于附加结构的简化,有较大的经济性.与一般箱形结构比较,自重可降低15%左右;制造劳动量减少(16～20)%.
In this paper, a preliminary theoretical study and experimental study on the box-girder structure of the derailment box girder are carried out, and the problems of torsion and reasonable cross-section of the girder due to the eccentric lateral concentrated force are analyzed. At the same time, And provides the design and calculation data, points out the problems to be further studied in the future.The conclusion of this paper is that: the decentered box girder bridge, under the action of the concentrated lateral force, mainly bears the bending stress and the torsional normal stress is only the total stress 2 ~ 8)%, and has a considerable torsional stiffness.This type of structure, due to the additional structure of simplified, more economical.Compared with the general box-shaped structure, weight can be reduced by about 15%; manufacturing labor Reduce (16 ~ 20)%.