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本文提出了一种下端敞口的新式Π型快速应急铁路钢桁梁,介绍了它的特点,讨论了这种梁跨结构在拖拉架设过程中的侧向总稳定性,导出了公式,并在计算机上求解,从而给出了一套简便可行的实用算法。用这种方法,可以验算任意跨度的兀型桁梁拖拉架设时的侧向稳定性问题。本文还首次提出了弯矩绕截面弱轴作用而可能首先绕强轴失稳的概念,指出了这种失稳现象可能发生的原因和条件,同时给出了验算方法,弥补了目前钢结构稳定设计方面的一个不足。
In this paper, a new Π-type rapid response steel truss girder with open end is presented. Its characteristics are introduced. The lateral stability of the beam-span structure in the process of dragging and erecting is discussed. Computer solution, which gives a simple and practical practical algorithm. In this way, we can verify the lateral stability of the truss girder with arbitrary span when it is dragged and set. This paper also puts forward the concept that the bending moment may weaken about the weak axis of the section first and then may first buckle around the strong axis. The causes and conditions of this instability phenomenon are pointed out. At the same time, the checking method is given to make up for the current stability of the steel structure An inadequate design.